5th Beam Telescopes and Test Beams Workshop 2017

24 Jan 2017, 09:30 → 27 Jan 2017, 14:10 Europe/Berlin

Residencia d'Investigadors (Barcelona (Downtown))

Hendrik Jansen (DESY), Ivan Lopez (IFAE Barcelona), Jan Dreyling-Eschweiler (DESY), Joern Lange (IFAE Barcelona), Simon Spannagel (DESY - CMS), Terzo Stefano (IFAE Barcelona)

This workshop will cover a wide range of topics related to test beams for detector studies in tracking detectors, calorimetry and beyond. It aims at bringing together both experts and newcomers from various fields. There will be a combination of presentations by experienced users, results from recent test beam studies and tutorials to teach the software required to analyse the results. Please have a look at the last two events to get a more detailed impression of the workshop's content: BTTB4 in Orsay in 2015 or BTTB3 in Hamburg in 2014.

Tuesday 24 January

AIDA WP5 Satellite Meeting

Registration

Welcome from the organisers

Conveners: Dr Hendrik Jansen (DESY), Mr Iván López Paz (IFAE-Barcelona), Dr Jan Dreyling-Eschweiler (DESY), Mr Joern Lange (IFAE Barcelona), Dr Simon Spannagel (CERN)

1 General BTTB Welcome

Speakers: Dr Hendrik Jansen (DESY), Dr Jan Dreyling-Eschweiler (DESY), Mr Joern Lange (IFAE Barcelona), Dr Simon Spannagel (CERN), Dr Stefano Terzo (IFAE)

Slides bttb5_welcome.pdf

2 Local BTTB Welcome

Speakers: Mr Joern Lange (IFAE Barcelona), Dr Stefano Terzo (IFAE)

Slides BTTB_Welcome_IFAE.pdf

Overview Lectures: Tracking, Calorimetry, Timing, DAQ systems

Convener: Dr Hendrik Jansen (DESY)

3 Overview: Trigger and DAQ system architectures in HEP

Triggering and data acquisition in High-Energy Physics, even in pretty simple cases, require a mixture of electronics, detector and software competences. Indeed, asynchronous signal handling may present critical issues in both digitization and trigger generation. As a function of the experimental conditions, the physics results may suffer from problems, for example, in signal-to-noise ratio, analogue-to-digital conversion, triggering and dead-time, data transfer bandwidth, modularity and system scalability, hardware and software architecture. Depending on size and time scale of the experiment, the choice of critical components may be forced to stay with commercial as well as home-made products. In the talk, some of the issues and possible solutions will be highlighted, together with examples of real implementations in HEP experiments or test-beam set-ups.

Speaker: Roberto Ferrari (INFN - Sezione di Pavia)

Slides BTTBW2017.pdf

4 Overview: Basics of calorimetry in test beams

With their ability to measure neutral particles, calorimeters are one of the most important components in particle physics detectors. They play a crucial role for the reconstruction of single particles and jets as well as event quantities like missing transverse momentum. Recently, calorimeters with high granularity have been developed that are essential for a very good jet energy reconstruction based on particle flow algorithms, and - combined with a good time resolution - can also help to mitigate the effects of pile-up. This presentation will give an overview of recent developments in calorimetry for future detectors at linear electron-positron colliders and upgrades of LHC detectors, and discuss the requirements specific for calorimeter beam tests.

Speaker: Katja Krueger (DESY)

Slides Calorimetry_BTTB5.pdf

15:30 Coffee Break

Overview Lectures: Tracking, Calorimetry, Timing, DAQ systems

Convener: Mr Joern Lange (IFAE Barcelona)

5 Overview: Basics of tracking and alignment

Tracking devices are the tool to reconstruct the trajectories of charged particles and play a central role in the reconstruction of whole events in complex multi-purpose detectors. Excellent tracking is crucial for many physics analysis at the LHC, e.g. the identification of b-quarkjets typically utilises tracking information. To optimise the performance of tracking systems, one has to study the properties of different materials with as little uncertainties as possible. One important systematic uncertainty are possible displacements and rotations of the detector modules leading to biases and degraded resolution in the track fit. This presentation gives an overview on tracking in general and at the example of the General Broken Lines track fit followed by an introduction into track-based alignment procedures as they are used in test beams, but also in large-scale experiments at the LHC.

Speaker: Gregor Mittag (DESY)

Slides Alignment-Tracking_BTTB-2016_20170124_removedPhotos.pdf

6 Overview: Basics of timing measurements

Precise measurement of the time of arrival of ionizing particles can be useful in High Energy Physics experiments, for example in high pile-up environments (4D tracking), like for the future generations of colliders, or for particle identification using the time of flight. More precise detectors are also useful outside the HEP community, for instance to increase the accuracy of PET, reducing at the same time the exposure of the patients. The technologies for timing can be categorized in: solid state detectors, i.e. silicon or diamond sensors; gas detectors, and Cherenkov light detectors. The read-out electronics needs to be optimized for timing and the arrival time can be computed using different approaches: a discriminator and a TDC or sampling the signal and using digital analysis. The latter has recently become possible also for integrated and low power systems thanks to the development of fast sampling devices, i.e. SAMPIC, PSEC, etc. Finally, the challenges of the integration of a timing detector in an LHC experiment will be discussed.

Speaker: Dr Nicola Minafra (The University of Kansas)

Slides Basics of Timing Measurements

Beam and Irradiation Facilities

7 Overview of the CERN PS/SPS Test Beam Facilities

CERN’s accelerator complex offers a great variety of multi-purpose test-beam facilities. In this presentation, an overview of the secondary beams derived from proton beams extracted from the Proton Synchrotron (PS) to the East Hall and from the Super Proton Synchrotron (SPS) to the North Hall facilities will be given. The available secondary particle beam momenta range from 0.5 GeV/c up to 10 GeV/c in the PS East Hall and from about 10 GeV/c up to 400 GeV/c in the SPS North Hall. The available intensities extend from about 103 up to 107 particles per spill. A special mention of the high-intensity high-energy test beam facility HiRadMat will be made. The readout of some of the beam instrumentation of the lines is also available to the user community and the beams can be optimized (within certain restrictions) to serve each experiment’s requirements. Financial support through transnational access can be offered under certain conditions to the user teams.

Speakers: Dr Johannes Bernhard (CERN), Dr Nikolaos CHARITONIDIS (CERN)

Slides CHARITONIDIS_BERNHARD_OverviewExpAreasv5.pptx

8 The CERN East Area Renovation Project

The East Area at the Proton Synchrotron is one of CERN’s longest running facilities for experiments, beam tests, and irradiations with a history of 55 years. The facility serves over 20 users for about 200 days of running each year and offers secondary electron, hadron, and muon beams within the range of 0.5 GeV/c to 12 GeV/c. In addition, the primary beam is transported to the irradiation facilities CHARM and IRRAD. Due to the steadily high demand of users, the CERN council approved an upgrade and renovation of the full facility to meet reliably future beam test and physics requirements. The renovation phase is scheduled during the Long Shutdown 2 (2019-2020) in order to assure availability of beams from 2021 on. We will give an overview of the project scope including planned upgrades, future beams, and infrastructure consolidation.

Speaker: Johannes Bernhard (CERN)

Slides EastAreaRenovation_Bernhard_BTTB5.pptx

9 Overview of irradiation facilities and AIDA-2020 Irradiation Facilities database

In view of the High-Luminosity upgrade of the CERN Large Hadron Collider (HL-LHC), performance studies of tracking and calorimetry detectors are essential. These detectors have to withstand harsh radiation environments and continue performing efficiently over the HL-LHC lifetime. This can only be achieved by performing test beams of irradiated devices. Therefore, sharing the knowledge about irradiation facilities with the Beam Telescope and Test Beam community is crucial. In this talk, we will focus on irradiation facilities linked to tests on irradiated tracking detectors and calorimeters. This contribution will include details about the available radiation fields and sources, their characteristics, their experimental conditions as well as safety requirements. In addition, the new Irradiation Facilities database, developed within the EU-funded project AIDA-2020, will be presented. This database is gathering in one unique location (CERN website) the relevant information about all irradiation facilities available at CERN, in the EU and worldwide. Currently, this database includes information collected from various existing sources. Over a longer term, this database aim is to be kept updated by the irradiation facilities owners and to be the main portal for anybody seeking for irradiation facilities information.

Speaker: Ms Blerina Gkotse (CERN)

Slides IrradiationFacilities_presentation.pptx

10 Electron Test Beams at SLAC

We present status of and future plans for the various electron test beam lines at SLAC. The presentation will focus on ESTB, the End Station (A) Test Beam, which after rebuilds during 2017, will continue to deliver 2 to 16 GeV primary electrons (10^9) per pulse, or single electron (1-100) per pulse at 5Hz rate.

Speaker: Dr Carsten Hast (SLAC National Accelerator Laboratory)

Slides Hast_SLAC_ESTB_TrackerWorkshop_Barcelona_2017.pptx

19:00 Welcome reception

Wednesday 25 January

Beam Telescopes and Reference Detectors

Convener: Dr Jan Dreyling-Eschweiler (DESY)

11 High Rate Beam Telescope Based on CMS Pixels

In order to investigate the rate behaviour of diamond detectors a stand-alone modular telescope was developed at ETH Zurich based on CMS Pixel Chips. The talk is going to briefly describe the basic functionality of the full telescope and its individual hardware parts and focus attention on the recent upgrades and future plans. I will also describe the improvements to the EUDAQ framework, the online-monitoring and some analysis methods which are relevant for the telescope. In conclusion I will show a few representative results.

Speaker: Mr Michael Reichmann (ETH Zuerich)

Slides HighRateBeamTelescope.pdf

12 A combined MIMOSA26 and ATLAS FE-I4 test beam telescope with parallel triggerless readout

Beam telescopes, such as the EUDET/AIDA telescope, are a commonly used tool for testing and characterization of pixel detector prototypes. Based on the MIMOSA26 telescope planes and an ATLAS FE-I4 reference plane, a fast, high resolution test beam telescope with continuous triggerless readout was derived. For the integration of this telescope into the Python-based data acquisition framework pyBAR, a new readout system was developed. It features a continuous, triggerless readout of the MIMOSA26 planes and precise event time-stamping from the FE-I4 as well as real-time data quality assessment. This new readout system was successfully tested and operated at the Bonn Electron Stretcher and Accelerator facility (ELSA) using a custom-made readout board. As the analysis of the test run suggests, the readout can cope with particle rates up to 20 kHz, which allows track reconstruction with efficiencies of more than 99%.

Speaker: Michael Daas (Physikalisches Institut der Universität Bonn)

Slides 2017-01-25_ANEMONE_Triggerless_Readout.pdf

13 Integration of MIMOSA26 sensors into a FEI4 planar sensor telescope

An integration of MIMOSA26 pixel modules[1] into a FEI4 telescope system[2] will be reported. The FEI4 telescope system has been running successfully for CMOS pixel sensors characterization for ATLAS Phase II ITK upgrade. The MIMOSA26 pixel modules, with much smaller sensor size compared to FEI4 planar sensor, are aimed to improve the spatial resolution of the telescope system, by at least a factor of two from simulation study. Integration of MIMOSA readout into the telescope readout will be presented, including some preliminary test results. Future integration of MIMOSA and FEI4 readout into FELIX[3] will also be presented. [1] J. Baudot et al., "First test results Of MIMOSA-26, a fast CMOS sensor with integrated zero suppression and digitized output," 2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC), Orlando, FL, 2009, pp. 1169-1173. [2] M. Benoit et al., "The FE-I4 telescope for particle tracking in testbeam experiments", JINST 11 (2016) no.07, P07003 [3] ATLAS Collaboration, "FELIX - the new detector readout system for the ATLAS experiment", ATL-DAQ-SLIDE-2016-374

Speaker: Lailin Xu (Brookhaven National Lab)

Slides Mimosa_BTTB2017_Lailin_v2.pdf

14 Data-taking experience with the CLICdp Timepix3 telescope

The vertex- and tracking detectors at the proposed high-energy CLIC electron-positron collider will be based on small-pitch silicon pixel- or strip detectors. The requirements for these detectors include single-point position resolutions of a few microns and time stamping with an accuracy of approximately 10 ns. Tests with particle beams are needed to assess the performance of existing and future prototype assemblies. To this end a high-resolution beam telescope based on Timepix3 hybrid pixel-detector assemblies with data-driven readout has been constructed and successfully commissioned in the H6 beam line of the CERN SPS. It allows for track reconstruction at high particle rates (data driven readout with up to 10 million tracks / second) and with excellent spatial (~2 microns) and temporal (~1 ns) resolution. The readout system follows the LHCb Timepix3 telescope architecture based on SPIDR boards and Xilinx Virtex-7 FPGAs. Several pixel detector prototypes with different readout architectures have been integrated into the telescope DAQ system and operated with high-energy hadron beams. The EUTelescope software framework is used for the reconstruction and data analysis. We present performance results for the telescope, discuss the event building and reconstruction methods for various devices under test and show examples of ongoing data analyses.

Speaker: Andreas Nurnberg (CERN)

Slides 20170125_BTTB_nurnberg_final.pdf

15 Update on the TimePix3 telescope

The TimePix3 telescope is a high rate, data driven beam telescope being used to study sensor prototypes for the LHCb VErtex LOcator (VELO) upgrade. In addition to VELO prototype sensors, the telescope has been used to study Upstream Tracker (UT), Scintillating Fibre (SciFi), Ring Imaging CHerenkov (RICH), Time-Of-Flight Ring Imaging CHerenkov (TORCH) and GasTpx3 prototypes. The telescope consists of 8 300 um p-on-n silicon sensors readout by TimePix3 ASICs. Tracks measured with the telescope have excellent temporal and spatial resolution, and can operate at high track rates. We present the software framework used in the reconstruction and analysis of the telescope data. This is based on the Gaudi framework used by many HEP experiments including LHCb. Alignment and reconstruction are performed automatically on a distributed computing system. The framework allows for flexible integration of external users with time-stamped triggers. Further analyses were performed trying to assess the telescope data rate capability and the pointing resolution at the DUT position. A dedicated simulation of the interaction of beam particles was written based on GEANT. This simulation reproduces a few interesting effects in the telescope planes which are understood to be due to diffusion and the relative angles of the telescople planes to the beam. A complete update and current status of the Timepix3 telescope will be presented.

Speaker: Ms Elena Dall'Occo (NIKHEF)

Slides 5thBTTB_elena.pdf

16 High-resolution tracking and timing based on HADES scCVD diamond sensors for detector tests.

The single crystalline Chemical Vapour Deposition (scCVD) diamonds have found applications in numerous fields in experimental physics including beam diagnostic, beam monitoring and time measurement of charged particles with picosecond precision. It has been demonstrated that scCVD diamonds can be used in single particle counting mode for MIPs with the picosecond precision. These detectors can also be used for high precision particle tracking. To demonstrate these capabilities a dedicated experiment has been performed at COSY-Juelich Synchrotron with protons of 2.9 GeV. A scCVD sensor with relatively simple electrode configuration has been used as a reference detector for a straw tube test and delivered excellent performance in terms of time precision and position determination. The sensor, which has been developed for the HADES experiment, can measure particle rates (MIPs) up to 10 MHz/mm^2 with time precision better than 100ps and additionally the position resolution better than 50 micrometers can be obtained. Such device can significantly simplify the test setups for detector performance tests. The presentation will focus on the operation of the scCVD diamond in single particle mode for MIPs with the picosecond precision and at the same time tracking capabilities with position resolution better than 50 micrometers. The performed test experiment will be presented in details.

Speaker: Dr Jerzy Pietraszko (GSI Helmholtzzentrum für Schwerionenforschung GmbH)

Slides J_Pietraszko_scCVD_diamond_High_resolution_v2.pptx

10:30 Coffee Break

Beam and Irradiation Facilities

Convener: Dr Henric Wilkens (CERN)

17 Characterization of the PiM1 beam at the PSI-HIPA facility

The PiM1 beam line at PSI has been employed during the last years mainly for detector tests and irradiation experiments. The beam momentum ranges from 10 to 500 MeV/c and the particle mixture includes electrons, muons, pions and protons. Recently, the momentum dependent fractional composition of negatively charged beam was measured by employing the time of flight (TOF) technique. The resulting beam line characterization is presented in this contribution. Moreover, a new TOF beam telescope for the PiM1 beam line is currently being developed by the MUSE (Muon proton Scattering Experiment) collaboration. During the tests, time resolution around 60 ps and efficiency in the order of 99.9 % have been demonstrated. In the near future, such detector could become a fixed installation of the PiM1 beam line.

Speaker: Dr Davide Reggiani (Paul Scherrer Institut)

Slides talk_final.pdf

18 DAFNE BTF improvements of the transverse beam diagnostics

The DAFNE BTF (beam-test facility) can provide electrons and positrons, tuning at runtime different beam parameters: energy (from about 50 MeV up to 750 MeV for e- and 540 MeV for e+), intensity (from single particle up to 1010/bunch) and pulse length (in the range 1.5–40 ns) up to 49 Hz, depending on the operations of the DAFNE collider. The beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad (downstream of the vacuum beam-pipe exit window), matching the user needs. We describe of the BTF beam transverse monitor systems based on FitPIX detectors, operating in bus synchronization mode externally timed to the BTF beam. We also describe our custom software allowing the acquisition and synchronization of the beam diagnostics with the users data, using TCP/IP calls to MEMCACHED. The performance of the system in a variety of beam intensity, energy and focussing conditions is reported.

Speaker: Dr Claudio Di Giulio (INFN LNF)

Slides C.DiGiulio_BTTB_2017.pptx

19 The DESY 2 Testbeam Facility

The DESY-II Test Beam Facility will resume operations in February 2017 The current status and the recent improvements and enhancements of the facility will be presented.

Speaker: Ralf Diener (DESY)

Slides BTTB17_DESY-Testbeam.pdf

20 The Fermilab Test Beam Facility

The Fermilab Test Beam Facility is a world class facility for testing and characterizing particle detectors. The facility has been in operation since 2005 and has undergone significant upgrades in the last three years. A second beam line with cryogenic support has been added, the process for getting beam has been streamlined, and the facility has adopted a unified data acquisition system. With two operational beam lines, the facility can deliver a variety of particle types and momenta ranging from 120 GeV protons in the primary beam line down to 200 MeV particles in the tertiary beam line. In addition, recent work has focused on analyzing the beam structure to provide users with information about the beam they are using. With these improvements, the Fermilab Test Beam facility is one of the most versatile test beams in the world, capable of supporting High Energy physics applications as well as industry users.

Speaker: Mandy Rominsky (Fermi National Accelerator Laboratory)

Slides BTTB_2017_FTBF.pdf

21 The new beam lines design for the CERN Neutrino Platform project

In the framework of the CERN Neutrino Platform project, two extensions of the existing SPS North Area “H2” and “H4” secondary beam lines, able to provide low-energy charged particles with momenta between 0.4 and 12 GeV/c, have been designed. An overview of the design as well as the parameters of these ‘very low energy’ beam lines are summarized in this presentation. Results from simulations offering an outlook to the expected performance of the beam lines, as well as to the optimization of the future in-line instrumentation will be presented.

Speaker: Dr Nikolaos CHARITONIDIS (CERN)

Slides VLE_beam_design_5thBTTB.pptx

Hands-On Tutorial

Convener: Dr Jan Dreyling-Eschweiler (DESY)

22 Short description of hands-on sessions

Each hands-on session will be shortly presented.

Speaker: Dr Jan Dreyling-Eschweiler (DESY)

Slides BTTB5_overview_hands-on.pdf

12:30 Lunch Break

Data Analysis and Test Beam Results

Data analyses and results from test beam campaigns

Convener: Dr Michael Rijssenbeek (Stony Brook University)

23 Scintillating Fibres for High Resolution Time Measurement?

Scintillating fibres coupled to silicon photomultipliers (SiPM) provide the unique combination of excellent time measurement of sub-nanoseconds, concurrently minimizing the material budget below one percent radiation length and high segmentation. Available state of the art technologies of fibres, such as different core materials, claddings, shapes and dimensions, along with their coupling to different SiPMs, mainly single sensors and arrays, are discussed. On the example of the scintillating fibre sub-detector of the Mu3e experiment, advantages and disadvantages, areas of applications and possible readout solutions are presented.

Speaker: Mr Simon Corrodi (ETH Zurich)

Slides bttb5_corrodis_c.pdf

24 Timing Performance of a Double Layer Diamond Detector

A new prototype based on two scCVD layers connected in parallel to the same amplifier has been designed in order to improve the timimng precision of TOTEM - CTPPs Time of Flight detectors. The tests performed during this summer on secondary partycle beams at the CERN North Area will be described in detail, analyzing the dufficulties we had to overcome. The optimization of the front-end electronics, together with the advantages of this set-up brought to obtain around 60 ps of timing resolution, an improvement larger than a factor of 1.6-1.7 for the timing precision of the measurement when compared to a one layer scCVD diamond detector.

Speaker: Mr Tommaso Isidori (INFN Pisa)

Slides Isidori_DoubleDiamond

25 Time Resolution Study of Micro Channel Plate PMTs

The high luminosity upgrade of the LHC will result in an average pile-up of about 200 interactions per bunch crossing. The time information of the particles measured by the detectors can be used to mitigate the effects of pile-up on the reconstructed data. Several groups are investigating different technologies to achieve a sufficient time resolution for this goal. The Picosec group of the CERN RD51 collaboration is developing gas detectors with high time resolution. A beam test was carried out in October 2016 to characterize the time performance of different gaseous and solid state detectors. The focus of this talk is the characterization of the Micro Channel Plate photomultiplier (MCP-PMT) used as time reference in the beam test. A special run with two MCP-PMTs and oscilloscope readout is used to characterize their time performance. The time resolution of the MPC-PMTs is studied using different algorithms. The influence of different effects on the time resolution of the system is investigated.

Speaker: Dr Matteo Centis Vignali (CERN)

Slides presentation.pdf

26 Performance of a prototype TORCH detector

TORCH (Time Of internally Reflected CHerenkov light) is a novel time-of-flight detector, designed to provide π/K/p particle identification up to ~10 GeV/c momentum and beyond. To achieve this, a time resolution of ~15 ps combining information from ~30 detected photons is required over a 10 m flight path. Large areas can be covered with TORCH, nominally up to 30 m2. One such application is for the LHCb experiment, to complement the particle identification capabilities of its RICH detectors. TORCH has a DIRC-like construction with 10 mm-thick synthetic amorphous fused-silica plates as a radiator. Cherenkov photons propagate by total internal reflection to the plate edges and there are focussed onto an array of position-sensitive photodetectors. Custom-built micro-channel plate photo-multipliers (MCP-PMTs) are being developed in collaboration with industry to provide the lifetime, granularity and time resolution to meet the TORCH specifications. Laboratory tests have been performed on the MCP-PMTs developed for TORCH and its readout electronics. Test beam measurements of a prototype TORCH detector in a low-momentum mixed beam of pions and protons are highlighted. Time resolutions for individual photons approaching 100 ps are achieved, after correction for dispersion effects in the quartz medium.

Speaker: Lucia Castillo Garcia (University of Oxford)

27 Beam tests of the AFP Time-of-Flight subdetector

To distinguish protons of interest in the piled-up LHC collisions a Time-of Flight (ToF) detector can be used. Main parameters deciding about the detector performance are its time resolution, pixelization and radiation hardness. We present a construction of the ATLAS Forward Proton ToF detector which will be installed in the LHC tunnel at the beginning of the 2017, after years of its development. Signal in the detector is created via Cherenkov effect in fused silica and is processed via Multi Channel Plate PhotoMulTiplier, the fast electronics containing the ultrafast Constant Fraction Discriminator and High Performance Time-to-Digital Convertor. Results achieved in the last 3 years and based on beam tests carried out in CERN and laboratories contributing to the AFP detector will be summarized, the actual resolution of the system without HPTDC (< 15 ps) and with HPTDC (< 30 ps), together with analysis of several contribution effects, will be shown.

Speaker: Tomas Komarek (Palacky University Olomouc)

Slides BTTB5_AFP_ToF_Komarek.pdf

28 Time resolution of 50 um thin LGAD before and after irradiation in beam tests

Silicon Low-Gain Avalanche Detectors (LGAD) are a promising technology for high energy physics experiments where high precision segmented timing sensors are required. This can be used for example in the ATLAS High Granularity Timing Detector (HGTD) or forward experiments like the ATLAS Forward Proton (AFP) and CMS-TOTEM Precision Proton Spectrometer (CT-PPS) for pileup removal. LGAD from a recent CNM production on a 50 um thin substrate were tested before and after neutron irradiation to 3e14 and 1e15 neq/cm2 at AFP beam tests in July and September 2016 at CERN SPS. A time resolution of ~30 ps was achieved, even after irradiations to 3e14 neq/cm2. The challenges to perform these measurements are discussed and the results are presented.

Speaker: Mr Fabian Foerster (IFAE Barcelona)

Slides FFoerster_BTTB_250117.pdf

16:00 Coffee Break

Data Analysis and Test Beam Results

Data analyses and results from test beam campaigns

Convener: Katja Krueger (DESY)

29 A High-Granularity Timing Detector for the Phase-II upgrade of the ATLAS Calorimeter system

The expected increase of the particle flux at the high luminosity phase of the LHC (HL-LHC) with instantaneous luminosities up to L=7.5 x 10^34 cm^-2 s^-1 will have a severe impact on pile-up. The pile-up is expected to increase on average to 200 interactions per bunch crossing. The reconstruction and trigger performance for electrons, photons as well as jets and transverse missing energy will be severely degraded in the end-cap and forward region, where the liquid Argon based electromagnetic calorimeter has coarser granularity compared to the central region. A High Granular Timing Detector (HGTD) is proposed in front of the liquid Argon end-cap calorimeters for pile-up mitigation at Level-0 (L0) trigger level and in offline reconstruction. This device should cover the pseudo-rapidity range of 2.4 to about 4.2. Four layers of Silicon sensors, possibly interleaved with Tungsten, are foreseen to provide precision timing information for charged and neutral particles with a time resolution of the order of 50 pico-seconds per readout cell in order to assign the energy deposits in the calorimeter to different proton-proton collision vertices. Each readout cell has a transverse size of only a few mm, leading to a highly granular detector with several hundred thousand readout cells. Using the information provided by the detector, the contribution from pile-up jets can be reduced significantly while preserving high efficiency for hard-scatter jets. The expected improvements in performance are in particular relevant for physics processes with forward jets, like vector-boson fusion and vector-boson scattering processes, and for physics signatures with large missing transverse energy. Silicon sensor technologies under investigation are Low Gain Avalanche Detectors (LGAD), pin diodes, and HV-CMOS sensors. The physics motivations and expected performance of the High Granular Timing Detector at the HL-LHC are summarized. The proposed detector layout and Front End readout, laboratory and beam test characterization of sensors and the results of radiation tests are presented.

Speaker: Lucia Masetti (Johannes Gutenberg Universitaet Mainz)

Slides ATLAS_HGTD.pdf

30 Construction and first beam-tests of silicon-tungsten prototype modules for the CMS High Granularity Calorimeter for HL-LHC

The High Granularity Calorimeter (HGCAL) is the technology choice of the CMS collaboration for the endcap calorimetry upgrade planned to cope with the harsh radiation and pileup environment at the High Luminosity-LHC. The HGCAL is realized as a sampling calorimeter, including an electromagnetic compartment comprising 28 layers of silicon pad detectors with pad areas of 0.5 — 1.0 cm^2 interspersed with absorbers made from tungsten and copper to form a highly compact and granular device. Prototype modules, based on hexagonal silicon pad sensors, with 128 channels, have been constructed and tested in beams at FNAL and at CERN. The modules include many of the features required for this challenging detector, including a PCB glued directly to the sensor, using through-hole wire-bonding for signal readout and ~5mm spacing between layers – including the front-end electronics and all services. Tests in 2016 have used an existing front-end chip - Skiroc2 (designed for the CALICE experiment for ILC). We present results from first tests of these modules both in the laboratory and with beams of electrons, pions and protons, including noise performance, calibration with mips and electron signals.

Speaker: Dr Rajdeep Chatterjee (University of Minnesota)

Slides HGC_Talk_Barcelona.pdf

31 Tests with beam setup of the TileCal Phase-II upgrade electronics

The LHC has planned a series of upgrades culminating in the High Luminosity LHC (HL-LHC) which will have an average luminosity 5-7 times larger than the nominal Run-2 value. The ATLAS Tile Calorimeter (TileCal) will undergo an upgrade to accommodate to the HL-LHC parameters. The TileCal electronics both on- and off-detector will be completely redesigned and a new readout architecture will be adopted. The photomultiplier signals will be digitized and transferred to the TileCal PreProcessors (PPr) located off-detector for every bunch crossing. Then, the PPr will provide preprocessed digital data to the first level of trigger with improved spatial granularity and energy resolution with respect to the current analog trigger signals. We plan to insert one TileCal module instrumented with the new electronics in the real detector to evaluate and qualify the new readout and trigger concepts in the overall ATLAS data acquisition system. This new drawer, so-called Hybrid Demonstrator, must provide analog trigger signal for backward compatibility with the current system. The 3in1 front-end option has been mounted in this Demonstrator which provides all the upgrade functionalities but maintaining the analog trigger signals. This Demonstrator drawer has been inserted in a TileCal module prototype to evaluate the operability and performance in the lab . In parallel, one more TileCal module has been instrumented with other two front-end electronics options based on custom ASICs (QIE and FATALIC) which are under evaluation. This two modules equipped with Phase-II upgrade electronics together with three modules equipped with the legacy system where exposed to different particles and energies in three test-beam campaigns during 2015 and 2016. This contribution will describe in detail the different components of the new readout electronics for the three options under evaluation. We will present the firmware and software developed explicitly for the tests with beam and we will show performance results for different types of particles as well as for calibration data.

Speaker: Mr DINGANE HLALUKU (University of the Witwatersrand (ZA))

Slides Tests_with_beam_setup_of_the_TileCal_Phase-II_upgrade_electronics.pdf

32 Muon Signals at a Low Signal-to-Noise Ratio Environment

Calorimeters provide high-resolution energy measurements for particle detection. Muon signals are important for evaluating electronics performance, since they produce a signal that is close to electronic noise values. This work provides a noise RMS analysis for the Demonstrator drawer of the 2016 Tile Calorimeter (TileCal) Test Beam in order to help reconstruct events in a low signal-to-noise environment. Muon signals were then found for a beam penetrating through all three layers of the drawer. The Demonstrator drawer is an electronic candidate for TileCal, part of the ATLAS experiment for the Large Hadron Collider that operates at the European Organization for Nuclear Research (CERN).

Speaker: Ms Tamar Zakareishvili (High Energy Physics Institute of Tbilisi State University)

Slides Muon_Signals_at_a_Low_Signal-to-Noise_Ratio_Environment.pdf

33 Combined beam tests of CALICE AHCAL and Beam Telescope

This talk summarizes the experience of combined test beam of CALICE Analog Hadron Calorimeter with beam telescope, both triggered by TLU. THE AHCAL is primarily designed for auto-trigger operation in short spills of 1 ms every 200 ms, it has been modified to run in continuous beam and to accept the TLU trigger as a trigger validation for the internal auto-trigger, leading to some event synchronization issues, which have been identified and solved. As a result, correlated events have been stored as EUDAQ events.

Speaker: Jiri Kvasnicka (DESY / IPASCR Prague)

Slides 2017-01-25_BTTB_kvas.odp 2017-01-25_BTTB_kvas.pdf

Thursday 26 January

Data Analysis and Test Beam Results

Data analyses and results from test beam campaigns

Convener: Dominik Dannheim (CERN)

34 Test beam measurements on the TowerJazz Investigator chip

The TowerJazz 180nm CMOS technology is being considered for the design of monolithic pixel sensors for the ATLAS inner tracker upgrade. Such devices will have to comply with the high rate and high radiation tolerance demands of the inner region of the ATLAS detector. To meet these requirements, a modified process has been developed and is being tested on a prototype chip, the Investigator. The chip is a collection of multiple pixel minimatrices, differring from one another by several parameters, thus allowing to study the optimal configuration in view of a final design. The chip was tested in a beam of charged pions at the SPS at CERN, where it was installed in one of the ATLAS FEI4 telescopes. In this contribution, we describe the data analysis that allowed us to extract information from just a few pixels, and we discuss the results, stressing on the comparison between unirradiated and irradiated samples.

Speaker: Dr Douglas Michael Schaefer (CERN)

Slides 1.pdf

35 First beam test of the monolithic HV-CMOS H35Demo chip

Silicon pixel detectors based on high voltage CMOS (HV-CMOS) technologies are currently being developed to investigate the possibility to install them in the upgrade of ATLAS inner tracker (ITk) for high luminosity LHC. HV-CMOS technologies can be used to produce fully monolithic sensors, where no additional front-end chip is required, or capacitively coupled devices (CCPD) where the sensor is connected to a read-out chip with non conducting glue. Both solutions are potentially radiation hard and more cost effective than the hybrid detectors currently used in the high energy physics experiments, where the sensor and the front end chip are interconnected through bump bonding. The H35Demo chip is a large area demonstrator ASIC produced in the AMS 350 μm HV-CMOS technology (H35). This chip, that includes both monolithic and analog matrices for CCPD, has been developed to investigate the performances of the AMS H35 technology and the opportunity to install HV-CMOS devices in the ATLAS ITk. A readout system based on a Xilinx ZC706 FPGA board has been developed at IFAE to configure and read out the monolithic matrices. The first beam test of the monolithic matrices of an H35Demo chip has been performed in November 2016 in the CERN SPS H8 beam line with the UniGe FE-I4 telescope. The technical challenges and the results of this first beam test will be presented.

Speaker: Mr Emanuele Cavallaro (IFAE)

Slides BTTB_Cavallaro.pdf

36 Preliminary test beam results of SOI monolithic pixel detectors

In the Silicon-On-Insulator CMOS structure the insulator layer is implemented between the handle wafer and the epitaxial silicon layer, which enables the design of a monolithic pixel detector without the need for bump-bonding. Due to the reduced detector volume there is much less particle scattering which results in a better spatial resolution. This is a significant advantage for vertex and tracking detectors at future linear colliders where high precision detectors are needed. In this contribution preliminary test beam results of a SOI pixel detector designed by the AGH-UST and IFJ PAN groups in Cracow and fabricated in Lapis 0.2 um SOI CMOS technology are presented. The tested detector is produced on 500 um thick high resistivity floating zone wafer. The pixel architecture is based on source-follower and its size is 30x30 um. The test beam data was recorded in the 120 GeV pion beam at the SPS H6 beamline at CERN in collaboration with the CLICdp collaboration in June-August 2016. The data was analysed in order to compute the spatial resolution of the detector. The analysis procedure includes pedestal and noise calculation, correlation with the Timepix3 reference telescope, different cluster reconstruction algorithms, as well as alignment and eta correction. Preliminary results give a spatial resolution of about 4 um in both X and Y directions.  The results are presented for different back bias voltages.

Speaker: Ms Roma Dasgupta (AGH-UST)

Slides 2017_BTTB_Dasgupta.pdf

37 High rate and photon testbeams with the MuPix at MAMI

Electron accelerator Mainzer Mikrotron (MAMI), MuPix chips (HV-MAPS) for Mu3e and P2 Experiment, high rate test in electron beam, high energy photon test.

Speaker: Mr Alexey Tyukin (KPH Mainz)

Slides ATyukin.pdf

38 Radiation length measurements with the DURANTA beam telescope

A major requirement for the construction of particle detectors is a low material budget, i.e. a small radiation length. Rough estimations of the radiaton length can be made using weight, material contributions and densities, but for more recent, e.g. new adhesives, PEEK and torlon, their radiation lengths are unknown. One method to assess radiation lengths directly is to look at high energy particle tracks traversing a material: a material, placed inside a beam telescope, will cause scattering of particles traversing the material. By reconstructing particle tracks and looking at the angular distributions of particle tracks behind a material, the material’s radiation length can be inferred. The method has successfully been used to study different objects: homogeneous blocks of materials to measure material radiation lengths, a combined structure to compare the theoretical radiation length calculated from individual material contributions to the overall radiation length, structures with small feature sizes to investigate the resolution of the method. This talk presents the basics of the method and reconstruction as well as recent results for measurements of different materials and combined structures.

Speaker: Ms Luise Poley (DESY)

Slides Radiation_length_measurements.pdf

10:40 Coffee Break

Data Analysis and Test Beam Results

Data analyses and results from test beam campaigns

Convener: Dr Simon Spannagel (CERN)

39 Synchrotron radiation tagging of 100 GeV electrons in NA64 experiment at the CERN SPS

The NA64 experiment at CERN is a new experiment searching for invisible decays of dark photons (A’) using a 100 GeV electron beam of the CERN SPS dumped in an active target. The experimental signature of such A’-> invisible decay is more than 50 GeV missing energy in the NA64 detector which cannot be produced by any known Standard Model process. To obtain the aimed sensitivity of NA64 to a single A'-decay for > 10^10 electrons on target, the use of an incoming electron tagging with efficiency better than 95% and suppression of hadron contamination in the e- beam down to the level < 10^-5 is required. The results obtained with a prototype version of the e- tagging system based on the detection of synchrotron radiation by a BGO detector are presented.

Speaker: Mr Emilio Depero (ETH)

Slides NA64_synch.pdf

40 Measurements of antiproton annihilations using GRACE: A new facility for the extraction of very low energy antiprotons at the CERN AD

In antimatter research, the detection and tagging of antiprotons and antihydrogen is usually achieved through the tracking of the annihilation products. In some instances, however, it proves useful to have the antiprotons annihilating directly within the detector volume, with the potential of sensibly improving the resolution on the position determination. The AEgIS collaboration at CERN aims to study antimatter gravity, i.e. to directly measure the free fall of antihydrogen with a precision of the order of few percent. The design of the experiment requires detection of antihydrogen annihilations with a resolution on the position of the order of 10 um. The R&D of such a position sensitive detector included evaluation of different detector technologies for direct antiproton annihilation. The first tests and measurements of direct antiprotons annihilations were performed in 2012 on monolithic active pixel and 3D sensors within the main AEgIS apparatus. The promising results lead to the development of a dedicated facility for detector tests and R&D, GRACE, which is operational since 2015. This beam line makes use of the secondary branch of the existing antiproton beam line at the Antiproton Decelerator, which it shares with the AEgIS experiment. GRACE exploits simple beam optics and an electrostatic deflector to provide antiprotons with very low energy (1-8 keV). Over the last two years GRACE has been employed to study the performance of the Timepix3 as a direct annihilation detector. The Timepix3 is an ASIC developed within the Medipix3 collaboration, characterized by an extremely high spatial resolution and accurate TOA (time-of-arrival) and TOT (time-over-threshold) information. For our application, the Timepix3 chip was coupled to a particularly thick (675 um) silicon sensor, allowing a much-improved tracking length. These characteristics make it ideal to tag the typical signature of antiproton annihilation, where several charged products depart from the annihilation point, with typical energies of hundreds of MeV, creating a signature star-shaped event. Part of the beam time on GRACE was used for antiproton annihilation measurements with CsI crystals, Cr-39 foils, as well as cryogenic tests of the Timepix3 detector. The talk will include an overview of the AEgIS experiment, as well as data analysis and results from several test beams on GRACE with different detector technologies.

Speaker: Dr Angela Gligorova (CERN)

Slides BTTB5_Gligorova.ppt

Beam Telescopes and Reference Detectors

Convener: Dr Simon Spannagel (CERN)

41 The ALPIDE telescope

For the upgrade of the ALICE Inner Tracking System a dedicated Monolithic Active Pixel Sensor – the ALPIDE - has been developed. It is 3 cm x 1.5 cm in size, features a spatial resolution of ~5um, an event-time resolution of <3us. The sensor can be thinned down to only 50um, making it suitable for high-resolution beam telescopes even at low beam energies.  Over the past months, we have been successfully operating a 7-plane telescope setup consisting of ALPIDE sensors at the CERN PS. A track resolution at the Device Under Test of 2-3um, depending on the exact mechanical configuration, was reached.  In this contribution, we will present the setup and its performance, give an overview of key measurements performed, and outline prospects for future developments.

Speaker: Dr Jacobus van Hoorne (CERN)

Slides vanHoorne_BTTB5_v2.pdf

42 The MuPix Telescope: Working Principle, Performance and MuPix Test Beam Results

The MuPix Telescope consists of up to eight layers of MuPix sensors, controlled and read out by two FPGAs. It is optimized to run at high particle rates of up to 1 MHz and provides precise reference timing using a coincidence of two scintillating tiles, which are timestamped with a 500 MHz clock. Online monitoring as well as online track reconstruction and efficiency calculations guarantee efficient test beam campaigns. The used pixel sensor is the MuPix7, a high voltage monolithic active pixel sensor thinned to 50 um with a fully integrated data driven readout, as well as on chip timestamps and an on chip transmitter sending a serial 1.25 GBit/s data stream to the readout FPGA. The MuPix7 has a Matrix of 32x40 pixels. Each pixel has a size of 80x103 um^2. I will discuss the MuPix7 features, working principle of the telescope and the performance at test beams. Additionally highlights from the test beam campaigns 2016 are shown.

Speaker: Mr Lennart Huth (Pi Uni Heidelberg - mu3e)

Slides BTTB5_huth.pdf BTTB5_huth_v2.pdf

43 Performance of the EUDET-type beam telescopes

The performance of the EUDET-type beam telescopes are shown making use of data taken with the DATURA beam telescope.

Speaker: Dr Hendrik Jansen (DESY)

Slides 2017_01_26_5BTTB_Barcelona.pdf

12:25 Lunch Break

AIDA WP15 Satellite Meeting

Indico Agenda

Hands-On Tutorial

44 Tutorial on GBL tracking

Speakers: Dr Hendrik Jansen (DESY), Dr Simon Spannagel (CERN)

Slides 2017-01-26-BTTB-HandsOn.pdf 2017_01_27_BTTB5_Handson.pdf

Hands-On Tutorial

45 Tutorial for the DQM4hep Data Quality Monitoring Framework

Speaker: Mr Tom Coates (University of Sussex)

Slides DQM4HEP_Hands-On_Session.odp

Hands-On Tutorial

46 Tutorial on simulation of silicon pixel detectors with Allpix

Speaker: Dr Mathieu Benoit (CERN)

Slides MB_Allpix.pptx

15:30 Coffee Break

AIDA WP15 Satellite Meeting

Indico Agenda

Hands-On Tutorial

47 Tutorial on the EUTelescope Reconstruction Framework

Speaker: Tobias Bisanz (Uni Göttingen - ATLAS)

Hands-On Tutorial

48 Tutorial on Fast Timing Algorithms

Speaker: Mr Nicola Minafra (CERN)

Slides HandsOnTiming

Tour of Casa Mila/La Pedrera (Gaudi house)

20:30 Workshop Dinner in La Pedrera

Friday 27 January

Tools and Methods for Test Beams

Convener: Jens Weingarten (Universitaet Goettingen)

49 Trigger Unit for High Rate Beam Tests

Telescopes for high rate beam tests require a dedicated trigger logic unit. This presentation will give an overview of how the ETH diamond group went from merging independent data streams by comparing time stamps to a fully integrated FPGA-based trigger logic unit for their telescope. The units core is an Artix-7 evaluation board, which is connected to a level converter board through the standardized FMC connector. The level converter board allows for differential as well as threshold adjustable single-ended inputs, the numerous outputs feature TTL and NIM signals. The FPGA’s firmware includes the logic block and a MicroBlaze soft core processor. The MicroBlaze hosts a HTTP server through which settings can be uploaded to the unit and the acquired data can be read out. The unit was fully incorporated into the EUDAQ software which allows the adjustment of almost all run parameters through a run configuration file. At the end of the presentation an outlook for a second potentially open-source version of a more sophisticated version will be given.

Speaker: Mr Christian Dorfer (ETH Zurich)

Slides bttb5_dorfer.pdf

50 New Clustering in TBMon2 for Sensors with Modified Pixel Implantations

In phase II the LHC will be upgraded to the High Luminosity LHC. To fulfill the increased particle flux and higher instant luminosity, the ATLAS experiment will be equipped with a new Inner Tracker (ITk). Because of the close position to the beam line, the pixel sensors of the ITk are exposed to high radiation. Planar n-in-n silicon sensors with different pixel implantations have been designed and one prototype sensor is artificially irradiated to simulate the radiation damage. The efficiency of the different pixel designs are studied by analyzing test beam data with the software framework TBMon2. To reduce the computing time and to allow the analysis of irradiated sensors, a new clustering for TBMon2 has been developed. The new clustering and the special implementation of the sensors is presented in this talk.

Speaker: Mareike Weers (TU Dortmund, Experimentelle Physik IV)

Slides BTTB_2017__Mareike_Weers.pptx

51 First use of the Allpix simulation tool: experiences and preliminary results

The Geant based ’Allpix’ tool can provide detailed simulation of testbeam setups and silicon sensors. It could therefore provide very interesting insights into sensors as well as the testbeam in general. In this presentation we discuss detalis and difficulties encountered during local installation and setup of the system, before a running version was obtained. Some preliminary results, such as Tot distributions and cluster size distri- butions are shown. Furthermore, using a provisional interface to the Bergen analysis program for efficiency measurements, a comparison is made with test beam data collected at CERN in September 2015. Here, special attention is made to selection criteria, such as window sizes around reconstructed tracks.

Speaker: Mr Andreas Heggelund (Univerity of Bergen)

Slides Allpix_sim_prelimResults_(1).pdf

52 EUDAQ2, a fresh release of the testbeam data acquisition software

EUDAQ software is original designed for the EUDET-type testbeam telescope and is running on EUDET telescope copies around the world for about 10 years. New features and significate change of APIs are introduced to new release of EUDAQ, aka EUDAQ2, it becomes much more flexible and easier to integrated to user hardware specific hardware. It is delivered with standard modules which users can adapt by their choice. Moreover, all code coupling with EUDET telescope in the core of EUDAQ2 is completely removed. It is possible to be adopted at the use cases where there is no testbeam telescope hardware existing in whole system.

Speaker: Dr Yi Liu (DESY)

Slides liuyi170125.pdf

53 The EUTelescope Reconstruction Framework

The EUTelescope reconstruction framework will be introduced. Focus is put on recent developments as well as new features which are currently under development.

Speaker: Tobias Bisanz (Uni Göttingen - ATLAS)

Slides talk.pdf

54 The Proteus pixel telescope reconstruction package

Beam telescopes are one of the key tools to study novel sensor prototypes. Successful measurements rely on fast and user-friendly track reconstruction to produce precise results in a timely fashion. The Proteus software is the reconstruction package used for the Geneva FEI-4 telescope. It is a further development of the previously used Judith package. It supports streamlined event processing, support for complex sensors with multiple sub-matrices, and updated robust alignment procedures. This talk will discuss the basic structure, functionality and its performance with the Geneva FEI-4 telescope.

Speaker: Dr Moritz Kiehn (Université de Genève)

Slides msmk-bttb5-proteus_telescope_reconstruction-v2.pdf

10:30 Coffee Break

Data Analysis and Test Beam Results

Data analyses and results from test beam campaigns

Convener: Dr Moritz Kiehn (Université de Genève)

55 Sensor Developments for the LHCb VELO Upgrade

The upgrade of the LHCb experiment, planned for 2019, will transform the experiment to a trigger-less system reading out the full detector at the LHC collision rate and up to $2\times 10^{33}cm^{−2} s^{-1}$ instantaneous luminosity. The Vertex Locator (VELO) is the silicon detector surrounding the interaction region. The upgraded VELO is based on a hybrid pixel system equipped with data driven electronics and designed to withstand a radiation dose up to 370 MRad or $8\times 10^{15} $ 1 MeV n$_{eq}$ $cm^{-2}. The detector will be composed of silicon pixel sensors with 55 × 55 $\mu ^2$ pitch, read out by the VeloPix ASIC which is being developed based on the TimePix/MediPix family. The VeloPix is capable of reading out up to 800 million hits per second. An additional challenge is the non uniform nature of the radiation damage, which results in requiring a guard ring design with excellent high voltage control. In addition, the n-in-p design requires the guard ring to be on the chip side making the high voltage reach the vicinity of the ground plane (about 30 $\mu$m apart). This requires a high voltage tolerant setup for irradiated assemblies which can be achieved using a vacuum chamber. Other solutions were also tried out and will be discussed in this presentation. The performance of the prototype sensors has been investigated in a test beam in which a dedicated telescope system was created with two arms each equipped with 4 Timepix3 assemblies. The device to be tested can be mounted, rotated, and cooled in the central region, with a optional vacuum setup. This allows several different tests of the performance of the sensor prototypes before and after irradiation. A collection of preliminary results will be presented, as well as a comparison of the performance of the different sensor prototypes produced by Micron semiconductors and Hamamatsu photonics. The evaluation programme of the prototypes also includes studies to show the effects of radiation damage. The sensors were irradiated at several facilities, including: JSI reactor neutrons in Ljubliana, mid energy (23 MeV) protons at KIT in Karlsruhe and high energy (24 GeV) protons from IRRAD at CERN.

Speaker: Mr Vinicius Franco Lima (University of Liverpool)

Slides BTTB_2017_v2.pdf

56 Beam test experience with small pitch 3D pixel sensors

The ATLAS experiment will replace the entire inner tracking detector with a completely new silicon-only system. 3D silicon pixel sensors are promising candidates for the innermost layers of the Pixel detector due to their excellent radiation hardness and low power dissipation. 3D pixel sensors with 50x50 and 25x100 µm² pixel pitches have been produced at CNM Barcelona and studied by IFAE. The smaller pixel size will allow to cope with the increased particle rate at HL-LHC and in addition the reduced electrode distance is expected to increase the radiation hardness. Initial studies of the small pitch 3D sensor prototypes coupled to the FEI4 readout chip, presently used on the current innermost layer of ATLAS (pixel size 50x250) were performed in test beams at CERN SpS. A new chip with pixel size of 50x50 µm² (RD53 - compatible with both small pixels) is still under development. Sensors of 50x50 and 25x100 µm2 pixel sizes were studied before irradiation. Also, 50x50 µm2 sensors were studied after uniform (at KIT to 5e15 neq/cm2) and non uniform irradiations (at CERN PS up to 1e16 neq/cm2). Two different types of telescopes were used to study the hit efficiency of the small pitch 3D sensors: an EUDET-type telescope in combination with the EUTelescope/TBMon2 reconstruction software and a custom-made FEI4 3D telescope in combination with the Judith reconstruction software. The EUTelescope/TBMon2 software was adapted to cope with the challenge that only one 50x50 µm² sub pixel within each 50x250 µm² FEI4 readout pixel is sensitive. The reconstruction of the FEI4 telescope data with Judith is also addressed.

Speaker: Mr David Vázquez Furelos (IFAE - Barcelona)

Slides dfurelos_BTTB_27-1-2017.pdf

57 Measurement of the Lorentz angle in CMS pixel detector modules

For the upgrade of the CMS experiment, the previous pixel detector was replaced by a new, four layer pixel detector during the extended 2016/17 shutdown. By using a new readout chip the detector will be able to operate at instantaneous luminosities of up to 2 x 10^34 cm^-2 s^-1 without significant efficiency losses. In the pixel detector barrel the 3.8 T magnetic field of the CMS solenoid will, due to deflection of the drifting charge carriers in the 285 um thick silicon sensor, cause charge sharing along the short side of the 150 um 100 um pixel cells and thus improve the intrinsic resolution of the detector modules. The Lorentz angle in the CMS barrel pixel detector modules was measured at the DESY Test Beam Facility using a 1.3 T magnetic field. Furthermore, simulations of the setup based on the AllPix framework and the pixelav package were performed. In this contribution the experimental setup is presented, measurement and simulation results are shown and compared.

Speaker: Mr Paul Schuetze (DESY - CMS)

Slides 2017_BTTB_PS.pdf

58 ALiBaVa Strip Sensor Analysis

Highly irradiated strip sensors from epitaxial silicon, read out by an ALiBaVa system, were measured in multiple test beam campaigns at DESY with the available beam telescopes. In this talk I will present the integration of the software reconstruction into EUTelescope and some analysis results. Difficulties and pitfalls in the analysis of a strip sensor DUT with a pixel sensor telescope will be shown and verification options with AllPix simulations are discussed.

Speaker: Dr Thomas Eichhorn (DESY)

Slides eichhorn_bttb17.pdf

59 Overview of Irradiation and Testbeam work for the ATLAS ITk Strips

The planned HL-LHC (High Luminosity LHC) in 2025 will necessitate a complete re-design of the current ATLAS Inner Detector (ID) to become the Inner Tracker (ITk), which will consist of both strip and pixelated silicon detectors.For the Technical Design Review (TDR) for the ITK Strips detector, it was required to show beam test results for a fully irradiated module. Consequently, a fully electrical Barrel Strip module was irradiated at CERN PS to 8x1014 n/eq cm-2, and subsequently characterised at a testbeam in CERN with the ACONITE telescope (an abstract with results will be submitted in a separate abstract in this workshop). This presentation will describe how the irradiation and testbeam campaign was arranged and integrated to achieve results for the TDR. Details will also be given of the challenges for 2017, where the sensor geometry designs of radial strip detectors for the end-cap (forward region) are being integrated into ALLpix and EuTelescope, with the plan of further irradiation and testbeams in 2017.

Speaker: Dr Jiri Kroll (Acad. of Sciences of the Czech Rep)

Slides bttb_barcelona_2017.pdf

60 Test-beam results of irradiated and un-irradiated prototypes for the ATLAS ITk Strip detector

During the High-Luminosity phase of the LHC the luminosity will be almost five times larger than the present LHC luminosity. In order to cope with the higher radiation level and the higher pile-up, the ATLAS experiment will need a complete replacement of the current tracking system with an all silicon detector, the Inner Tracker (ITk). The ATLAS ITk Strip detector will be subjected to a radiation level up to 1.2x10^15 1MeV neq/cm^2, more than one order of magnitude larger than the maximum radiation expected for the current strip detector, the Semiconductor Tracker (SCT). For this reason, new radiation-hard sensors and front-end chips will be used and are now under development. It is vital to study the performance of these new components when they are subjected to a radiation close to the one expected at the end of the lifetime of the HL-LHC. In this talk, we will present test-beam results obtained with several prototypes with various strip length (1 cm, 2.5 cm and 5 cm) and subject to high radiation fluences (up to 2x10^15 1MeV neq/cm^2). The strips are wire-bonded to the front-end chips, the ABC130 (ATLAS Binary Chip), which provide a binary read-out. The measurements were performed with EUDET-type telescopes at DESY in May and CERN in July 2016 and the track reconstruction was performed with the General Broken Lines algorithm implemented in the EUTelescope framework. The main focus of the analysis lies in the study of the degradation of the efficiency, collected charge and noise occupancy after irradiation. The results provided crucial information to understand the performance and the radiation-hardness of these new sensors and front-end chips.

Speaker: Ms Veronica Fabiani (NIKHEF)

Slides BTTB_27_01_2017.pdf

Closing session

Conveners: Dr Hendrik Jansen (DESY), Dr Jan Dreyling-Eschweiler (DESY), Dr Simon Spannagel (CERN)