4th Beam Telescopes and Test Beams Workshop 2016

3 Feb 2016, 08:00 → 5 Feb 2016, 14:00 Europe/Berlin

Auditorium (LAL Orsay)

Clara Nellist (LAL - Orsay), Hendrik Jansen (DESY), Jan Dreyling-Eschweiler (DESY), Simon Spannagel (DESY - CMS)

The event main page is http://events.lal.in2p3.fr/conferences/Workshop-BTTB/index.html Please find the registration there. This workshop will cover a wide range of topics related to tools needed for detector studies for the High Luminosity-LHC and beyond through test beams and aims at bringing together both experts and newcomers to the field. 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. Connect via Vidyo: https://vidyoportal.cern.ch/flex.html?roomdirect.html&key=MRYSK6dfPa4jBoVgB7kdEnf8wc

Wednesday 3 February

08:30 → 09:00 Registration

09:00 → 09:10 Welcome address

Slides slides_WKSHOP.pptx

09:10 → 10:30 Beam telescopes

09:10 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 Gridpix prototypes. The telescope consists of 8 layers of 300 um p-on-n silicon sensors read out by TimePix3 ASICs. Tracks measured with the telescope have excellent temporal (~1 ns) and spatial resolution (~2 um), and can operate at a rate of up to 10 Mtrack/s. Besides the telescope performance we also 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. The software can reconstruct and analyze ~ 15,000 tracks per second. Alignment and reconstruction are performed automatically on a distributed computing system. The framework allows for flexible integration of detectors from external users via time-stamped triggers. During the 2015 testbeam campaigns, approximately 37 billion tracks were recorded and reconstructed.

Speaker: Mr Timothy Evans (CERN)

Slides presentation.pdf

09:30 The CLICpix 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. Time stamping with an accuracy of approximately 10 ns is required to suppress hits from beam-induced backgrounds. 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 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. We present the telescope hardware and its readout architecture, as well as the concept for integration of devices under test based on EUDAQ producers. First telescope commissioning results will also be shown.

Speaker: Dr Adrian Fiergolski (CERN)

Slides CLICTimepix3Telescope-A.Fiergolski

09:50 Performance and Results from the MuPix Telescope

This talk will give an overview over the MuPix Telescope. After a short introduction, the results from the Mu3e MuPix testbeam campaigns 2015, covering the DESY II, SPS and PSI tetsbeams, focusing on efficiency measurements are presented.

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

Slides pres.pdf

10:10 HV-MAPS Tracking Telescope: Fast Data Transfer with Direct Memory Access

In the context of the Mu3e experiment, High Voltage Monolithic Active Pixel Sensors (HV-MAPS) are developed as constituents of a highly efficient tracking detector with good momentum, vertex and timing resolution. The MuPix HV-MAPS prototypes were arranged in a telescope setup with four layers as an integration test and for efficiency measurements. For high-rate data taking, fast data transfer is required. Therefore, data transmission via Direct Memory Access (DMA) has been implemented and was tested at a beam test at DESY (Hamburg). In addition, efficiencies were calculated from straight tracks reconstructed online on a graphics processing unit (GPU). This talk introduces the readout scheme of the MuPix telescope and focusses on the DMA implementation and the GPU track reconstruction.

Speaker: Ms Dorothea vom Bruch (Johannes Gutenberg-Universität Mainz)

Slides talk.pdf

10:30 → 11:00 Coffee

11:00 → 12:00 Irradiation facilities

11:00 Ljubljana JSI TRIGA Reactor

The upgrade scenario of the LHC to a luminosity of 1035 cm-2 represents a challenge for development of detector components as well as for their tests after irradiations under realistic conditions. Fluences of fast hadrons above 1016 cm-2 are expected in the most exposed regions of detectors. Spectra of particles cover a wide range with energies up to tens of GeV. Irradiation facilities cannot exactly reproduce these spectra therefore it is important to make irradiations with different particles and energies to understand the damage mechanism in detectors. Triga Mark II reactor at Jožef Stefan Insitute in Ljubljana has been widely used as irradiation facility in last two decades mainly to study damage caused by nonionizing energy loss (NIEL) in variety of materials. Irradiations are done by insertion of samples directly into the reactor core. Good knowledge of spectrum of neutrons which covers energies from thermal to several MeV is important for evaluation of NIEL equivalent fluences. For example only fast neutrons with energies larger than 100 keV contribute significantly to the NIEL in silicon, the contribution of slower (thermal, epithermal) is only about 1 %. Reactor is available for irradiations in the framework of AIDA2020 transnational access program. Description of irradiation channels, their limitations and support infrastructures will be described in the presentation

Speaker: Dr Vladimir Cindro (Jožef Stefan Institute)

Slides presentation.pptx

11:20 IRRAD: THE NEW 24GeV/c PROTON IRRADIATION FACILITY AT CERN

The proton and mixed-field irradiation facilities at the CERN PS East Area (known as IRRAD1 and IRRAD2), have been heavily exploited for irradiation of particle detectors, electronic components and materials since 1992. With the increasing demand of irradiation experiments, and in view of the High-Luminosity upgrade of the CERN Large Hadron Collider (HL-LHC), these facilities suffered of a number of unpleasant restrictions such as the space availability, the maximum achievable particle flux and several access constraints. In the framework of the AIDA project, an upgrade of these facilities was carried out during the Long Shutdown 1 (LS1) of the CERN accelerator complex. The new combined East Area IRRADiation facility (EA-IRRAD) was commissioned in October 2014. While the new proton facility (IRRAD) continue to be mainly devoted to the radiation hardness studies for the High Energy Physics community, the new mixed-field facility (CHARM) mainly hosts irradiation experiments for the validation of electronic systems used in CERN accelerators. In this presentation, we describe the new IRRAD proton facility in terms of layout, area equipment and potential for future irradiation experiments.

Speaker: Dr Federico Ravotti (CERN)

Slides IRRAD__Facility_BTTB_February_2016_PDF.pdf

11:40 Irradiation facilities at KIT

At KIT we conduct irradiations with 23MeV protons and X-rays. We present the facilities, irradiation procedures and how to apply. Few examples of performed irradiations will be show as well.

Speaker: Dr Alexander Dierlamm (Karlsruher Institut für Technologie)

Slides IrradFacilities-KIT_aldi.pdf

12:00 → 12:30 Discussions

12:00 Discussions

12:30 → 14:00 Lunch

14:00 → 15:20 Beam telescopes

14:00 The Geneva FE-I4 Telescope

In 2014 an ATLAS FE-I4 based telescope was built and operated in various CERN PS and SPS testbeams. The 6 plane system consists of IBL like 150um planar pixel sensors (250x50um2 pitch) which are read out by the RCE DAQ system. This ensures fully synchronized data for FE-I4 compatible devices under test. The telescope triggers itself and allows for defining a region of interest, which especially for small DUTs increases the amount of usable data greatly. In combination with the centrally monitored and controlled DCS, including LV and HV supplies, cooling capabilities and remote DUT positioning via movable stages this forms a fully integrated system for detector characterization. Multiple ATLAS planar pixel sensors and HVCMOS as well as non-FE-I4 based devices have been successfully characterized over the last two years. A description of the telescope with latest results and upgrade plans will be presented.

Speaker: Mr Branislav Ristic (CERN / University of Geneva)

Slides BTTB4_20160203_Geneva_FEI4_telescope_bristic.pdf

14:20 High rate pixel telescope.

We present the design, the commissioning, and the performance of a modular pixel telescope, which was equipped with the CMS PSI46v2 pixel chip. The telescope was designed with a primary goal of testing pad and pixel diamond detectors in the high flux beam line at the High Intensity Proton Accelerator in PSI. This beam line is able to provide intensities up to 10 MHz/cm2. The unique features of the PSI46v2 chip are its ability to provide a fast trigger and its ability to scale down the trigger area to the size of the device under test (DUT). The main module of the telescope is based on the motherboard, which accepts up to 3 pixel planes. Several motherboards can be combined into a single telescope read out by a single test board. In the beam test the telescope was used in a configuration with two front and two back planes, where the DUT was placed in between the front and the back modules. The same motherboard can be used to accommodate other versions of the PSI46 chip, for example, the low threshold PSI46dig chip, which was used as DUT. The low threshold of the PSI46dig chip makes it suitable for studying sensors with low signals. In another configuration the telescope was used to test two diamond pad detectors. The telescope DAQ is based on the EUDAQ framework, with a specially added feature to monitor both the performance of the telescope and of the DUTs.

Speaker: Mr Michael Reichmann (ETHZ)

Slides HighRateBeamTelescope_(2).pdf

14:40 The EUDET-type telescope family (incl. EUDAQ)

This talk will give an overview about the EUDET-type telescopes and its user infrastructure. Hardware components and DUT integration will be presented. Furthermore, a EUDAQ status will be shown as well as ongoing development.

Speaker: Dr Jan Dreyling-Eschweiler (DESY)

Slides bttb4_telescope_jde_pdf-version.pdf

15:00 KarTel - Ljubljana telescope based on M26 sensors.

I will present KarTel, a telescope build in Ljubljana and based on Mimosa 26 sensors. As an illustration of KarTel operation - a novel method will be presented that can be used to investigate the properties of silicon and CVD diamond detectors for High Energy Physics experiments. The method is similar to the already well established E-TCT technique using laser beam. In the proposed method the beam of high energy hadrons (MIPs) is used instead of laser beam. MIPs incident on the detector in the direction parallel to the readout electrode plane and perpendicular to the edge of the detector. Such experiment could prove very useful to study CVD diamond detectors which are almost inaccessible for the E-TCT measurements with laser due to large band-gap as well as to verify and complement the E-TCT measurements of silicon. The method proposed is being tested at CERN in a beam of 120GeV hadrons using a KarTel telescope based on Mimosa 26 sensors with track resolution at the DUT of few μm. MIPs passing trough 6 planes of the reference telescope with the DUT detector in the middle are triggered by 2 scintillators. The preliminary results of the measurements will be presented.

Speaker: Dr Andrej Gorisek (J. Stefan Institute, Ljubljana)

Slides Gorisek-4thBTTBW.pdf

15:20 → 15:40 Test beam facilities

15:20 The DESY-II Test Beam Facility

The DESY-II Test Beam Facility will resume operations in March 2016 The recent improvements and enhancements of the facility will be highlighted.

Speaker: Mr Marcel Stanitzki (DESY)

Slides testbeams_at_desy2016.pdf

15:40 → 16:10 Coffee

16:10 → 17:30 Test beam facilities

16:10 The Secondary Beam Lines and the Irradiation Facility of the PSI Proton Accelerators

This contribution will give an overview of the secondary beam lines of the PSI High Intensity Proton Accelerator (HIPA). Particular emphasis will be given to those facilities currently available for tests. Moreover, the Proton Irradiation Facility (PIF) located at the PSI PROSCAN protontherapy centre will be presented.

Speaker: Dr Davide Reggiani (Paul Scherrer Institut)

Slides talk_reggiani.pdf

16:30 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 two years. A second beam line with cryogenic support has been added and the facility has adopted a data acquisition system. The facility also recently added a cosmic telescope test stand and improved tracking capabilities. 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 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 on the data they are collecting. 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. The upgrades will be discussed along with plans for future improvements.

Speaker: Mandy Rominsky (Fermi National Accelerator Laboratory)

Slides FTBF_rominsky_BTTB16.pdf FTBF_rominsky_BTTB16.ppt

16:50 Status of Caladium at SLAC

In 2015 the Caladium silicon telescope of Carleton University, Canada was loaned to SLAC and installed at the End Station Test Beam facility (ESTB). Caladium is a member of the EUDET/AIDA beam telescopes family and is now available to Users at SLAC. We will present the available infrastructure, DAQ, cooling, moving stages, etc. as well as first results of our commissioning runs.

Speaker: Dr Carsten Hast (SLAC National Accelerator Laboratory)

Slides Hast_SLAC_ESTB_TrackerWorkshop_LAL_2016.pptx

17:10 CERN testbeam facilities

The status of the PS/SPS Testbeam Facilities are presented.

Speaker: Dr Henric Wilkens (CERN)

Slides HW20160203-Orsay.pptx

17:30 → 18:00 Discussions

17:30 Discussions

Thursday 4 February

09:00 → 10:40 Data analysis

09:00 ATLAS ITk UK Pixel Sensors

The UK has produced a number of pixel sensors based on the FEI4b chip for ATLAS ITk. These sensors vary in pixel dimension and coupling technology. This talk will present progress in characterising these devices, including a comparison of pixel geometries based on cluster parameters and resolution at CERN and DESY testbeams.

Speaker: Dr Kenneth Wraight (University of Glasgow)

Slides BTTB_16_2_4_ed.pptx

09:20 Beam tests of pixel-detector prototypes for the CLIC vertex detector

Hybrid pixel-detector prototypes with small pitch (25-55 microns) and thin sensors (50-300 microns) are currently under study for the vertex detector at the proposed high-energy CLIC electron-positron collider. Test-beam campaigns with hybrid assemblies of planar and active HV-CMOS sensors on CLICpix ASICs and with active edge sensors on Timepix3 ASICs have been performed at the CERN SPS H6 beam line using the Mimosa-based AIDA telescope with rolling-shutter readout as well as a new Timepix3-based telescope with data-driven readout. The performance of the assemblies is evaluated for different operating conditions (bias voltage, detection threshold, rotation angle). We present the status of the reconstruction, alignment and subsequent data analysis. Emphasis will be put on the discussion of a new event model adapted to the data-driven readout scheme of the Timepix3 telescope.

Speaker: Dr Andreas Nürnberg (CERN)

Slides 20160204_BTTB_nurnberg.pdf

09:40 Test beam studies on n-in-p planar pixel sensors

Pixel modules composed by n-in-p sensors interconnected to ATLAS FE-I4 chips and irradiated up to a fluence of 5e15 were measured at testbeam campaigns at DESY and CERN. The AIDA-Telescopes at both sides together with the EuTelescope softwaere were used in order to study the performance after irradiation in terms of hit efficiency of different pixel cell designs. Different resolutions were obtained from the two test beams which will be discussed and compared. Measurements of charge collection at different depths in the pixel sensor bulk have been obtained with the grazing angle technique for n-in-p pixel sensors. This analysis also allows for the determination of hit efficiency with small pixel pitches in the high pseudo-rapidity range of the new pixel systems at HL-LHC. Furthermore not irradiated modules with thin sensors (100 um) were tested with the FEI4-Telescope at CERN and reconstructed with the Judith and EuTelescope software. The results will be discussed and compared.

Speaker: Natascha Savic (MPI)

Slides TBworkshop0216_Orsay_NSavic.pdf

10:00 Test Beam Measurements for the Upgrade of the CMS Phase I Pixel Detector

Based on the strong performance of the LHC accelerator, it is anticipated that peak luminosities of two times the design luminosity of L = 2 x10^34 cm^-2s^-1 are likely to be reached before 2018 and probably significantly exceeded in the so-called Phase I period until 2022. At this higher luminosity and increased hit occupancies the current CMS pixel detector would be subject to severe dead time and inefficiencies introduced by limited buffers in the analog read-out chip and effects of radiation damage in the sensors. Therefore a new pixel detector is being built and will replace the current detector in the extended year-end technical stop in 2016. The new front-end readout chip is an integral part of the upgrade and comprises larger data buffers, an increased transmission bandwidth, and low-threshold comparators. These improvements allow the new pixel detector to sustain and improve the efficiency of the current pixel tracker at the increased requirements imposed by high luminosities and pile-up. This contribution presents performance measurements of the production read-out chip and final detector modules conducted at the DESY test beam facility.

Speaker: Mr Simon Spannagel (DESY - CMS)

Slides 2016-02-04-BTTB-CMS-Pixel-Testbeams.pdf

10:20 Beam test of 3D pixel detectors up to fluences of 9e15 neq/cm2

3D FEI4 pixel detectors from the IBL production were non-uniformly irradiated at CERN-PS with 23 GeV protons up to a maximum fluence of 9e15 neq/cm2. The devices have been studied in beam tests at CERN SPS and good efficiencies of >97% have been achieved at the highest fluence already at 170 V. Especially interesting is the option to study a vast range of fluences on a single pixel device due to the non-uniform beam profile. This presentation will give an overview on the achieved results.

Speaker: Mr Fabian Foerster (IFAE Barcelona)

Slides FFoerster_BTTB16_040216_v0.5.pdf

10:00 → 11:50 AIDA2020 - WP5

10:40 → 11:10 Coffee

11:10 → 11:50 Tools

11:10 Re-timing testbeam data

A description of why and how to re-time test beam data, based on limited length timestamps.

Speaker: Dr Jens Dopke (STFC Rutherford Appleton Laboratory)

Slides 20150204_TestbeamWorkshop_TiminginTestbeam.pdf 20150204_TestbeamWorkshop_TiminginTestbeam.pptx

11:30 Allpix, a Generic Monte-Carlo framework for pixel detector simulation

Allpix is a Monte-Carlo simulation framework for pixel detector based on GEANT4. It allow for the user to easily define simulation scenario for all kind of geometry from the more complex to the most simple. Validated detector models for multiple detector are provided along with useful simulation models for the calculation of important quantities such at LET, dE/dX or delta ray production are also provided. In this presentation I will introduce the allpix software and present a few examples of use in single sensor, telescope and full detector simulation.

Speaker: Dr Mathieu Benoit (UNIGE)

Slides MB_Allpix.pdf

11:50 → 12:50 Tools

11:50 EUDAQ Generic Online Monitoring System

In this talk I will present plans and future developments of a generic online monitoring system for EUDAQ software package. The current monitoring system of EUDAQ was developed and designed for beam telescopes detectors. We present plans to develop a general purposed monitoring system within EUDAQ that will serve different type of detectors.

Speaker: Dr Carlos Chavez (University of Sussex)

Slides EUDAQMonitoringBTTBFeb16.pdf Monitoring_Framework_-_EUDAQ.pdf

12:10 Monitoring Framework - SDHCAL based

Speaker: Rémi Eté (CNRS/IPNL)

Slides DQM4HEP.pdf

12:30 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: Mr Tobias Bisanz (Uni Göttingen - ATLAS)

Slides talk.pdf

12:50 → 14:20 Lunch

14:20 → 15:20 AIDA2020 - WP5

14:20 → 17:00 Tutorials

14:20 EUTelescope (for ATLAS Pixel) Hands-On Tutorial

Speaker: Tobias Bisanz (Uni Göttingen - ATLAS)

15:00 AllPix Hands-On Tutorial

Speaker: Dr Mathieu Benoit (CERN)

17:00 → 18:00 Travel to Paris

18:00 → 20:00 Visit of the museum

20:00 → 22:00 Dinner

Friday 5 February

09:00 → 10:00 Tools

09:00 The Implementation of the GBL Algorithm within EUTelescope

A versatile implementation of the GBL algorithm within EUTelescope is introduced. Features of the implementation and current developments are highlighted. Current analyses are briefly described as an aid for further reconstruction work.

Speaker: Mr Alexander Morton (University of Glasgow)

Slides presentation_1.pdf

09:20 IFAE Track reconstruction with EUTelescope

3D pixel sensors before and after irradiation have been tested in the September 2015 ATLAS Pixel testbeam at CERN. Both the latest Eutelescope version and a stable previous release have been used for track reconstruction. This talk will present the experience installing and working with both software versions.

Speaker: Mr David Vázquez Furelos (IFAE - Barcelona)

Slides release-standalone-2016-1-29_18-44.log testbeam_workshop-2016-dvfurelos.pdf

09:40 Status of the miniTLU

Speaker: Dr David Cussans (Bristol University)

Slides tlu_status_aida_commonDAQ_bttb_2016.pdf tlu_status_aida_commonDAQ_bttb_2016.pptx

10:00 → 10:20 Data analysis

10:00 Beam tests for the ATLAS ITk strip upgrade

The Silicon strip detector will form one component of the ATLAS Integrated Tracker upgrade for the High-Luminosity LHC. Recent tests of the prototype sensors and electronics have been performed at the DESY II testbeam, using the DURANTA telescope with an additional pixel layer to improve timing resolution. Results will be shown on the tracking performance using the Generalized Broken Lines algorithm, along with results of the gain measurements of the readout electronics.

Speaker: John Keller (DESY)

10:20 → 10:50 Tea

10:50 → 12:50 Data analysis

10:50 DAFNE Beam Test Facility and Performances Assessments of Larger Pixels CMOS sensors

The DAFNE Beam Test Facility (BTF) is a beam transfer line optimized to produce single electrons/positrons for detector performances assessment. This contribution will describe the implementation in this facility of an ultra-thin and high spatial resolution beam telescope for the performances assessment of large pixel CMOS sensors designed to instrument the outer layers of an inner tracker.

Speaker: Mr Alejandro Perez Perez (IPHC)

Slides Perez_Workshop_BeamTelescopes_And_BeamTest_Feb2016.pdf

11:10 A comparative sensor testbeam using micro-focused X-rays

A micro-focused (2.5um spot size) 15keV X ray beam has been used to study silicon micro-strip and pixelated detectors that utilise reduced edge or edgeless designs. Scans were taken across the physical edges of devices to measure the charge collection as well as study the electric field line behaviour. We will show the methods used for alignment, DAQ integration, triggering and data analysis. Results will also be shown involving pixel sensors with a range of bulk type (n-on-n & n-on-p) and detector thickness's (100, 150 & 300um), as well as proton irradiated strip sensors (up to 5x1015ncm-2). These results indicate the use of micro focused X-rays is a valid complimentary beam test for particle detector characterisation

Speaker: Dr Andy Blue (Univesrity of Glasgow)

Slides bttb2_andy.ppt

11:30 Intrinsic resolution studies with the DATURA telescope

The intrinsic resolution of the MIMOSA26 sensors used in the DATURA beam telescope are extracted deploying an iterative method using GBL track fits. The data was taken at the DESY-II test beam facilities. Additionally, the applicability of the Highland formula to electron beams is tested against data.

Speaker: Dr Hendrik Jansen (DESY)

Slides 2016_02_05_4BTTB_Orsay.pdf

11:50 Beam tests of the ATLAS Forward Proton (AFP) Detector

The ATLAS Forward Proton (AFP) project intends to measure protons scattered under a small angle from the ATLAS proton-proton interaction point. To this end, it is planned to install 3D Silicon pixel and Quartz-Cherenkov time-of-flight detectors 210 m away from the interaction point. Beam tests with a first unified AFP prototype detector combining tracking and timing sub-detectors and a common readout have been performed at the CERN-SPS in November 2014 and September 2015 to complete the system integration and study the detector performance. The successful tracking-timing integration was demonstrated by the spatial correlation of recorded tracking and timing data. Good pixel hit efficiencies above 99% were observed. Spatial resolutions in the short pixel direction of 6 um per pixel plane and of 3--4 um for the full 4-plane tracker were found, surpassing the AFP target of 10 um. The timing detector showed also good hit efficiencies above 99%, and a full-system time resolution of 35 ps was found for a train of two Quartz bars without dedicated optimizations, fulfilling the requirements for the initial low-luminosity AFP runs.

Speaker: Mr Joern Lange (IFAE Barcelona)

Slides Lange_AFPBeamtest_TestbeamWorkshop_Feb2016.pdf

12:10 Characterization of thin irradiated epitaxial silicon sensors for the CMS phase II pixel upgrade

The high-luminosity upgrade of the Large Hadron Collider, foreseen for 2025, neces- sitates the replacement of the tracker of the CMS experiment. The innermost layer of the new pixel detector will be exposed to severe radiation corresponding to a 1 MeV neutron equivalent fluence up to Φ eq = 2 · 10 16 cm −2 and an ionizing dose of ≈ 10 MGy after an integrated luminosity of 3000 fb −1 . Silicon crystals grown with different methods and sensor designs are under investigation in order to optimize the sensors for such high fluences. Thin planar silicon sensors are good candidates to achieve this goal, since the degradation of the signal produced by traversing particles is less severe than for thicker devices. Epitaxial pad diodes and strip sensors irradiated up to fluences of Φ eq = 1.3·10 16 cm −2 have been characterized in laboratory measurements and beam tests at the DESY II facility. The active thickness of the strip sensors and pad diodes is 100 μm. In addition, strip sensors produced using other growth techniques with a thickness of 200 μm have been studied. As the noise of the sensors increases with the accumulated fluence, the track informa- tion provided by the beam telescope is used to improve the separation of signal and noise in the strip sensors measurements, hereby improving the spectra of the collected charge. In this talk, the results obtained for p-bulk sensors are shown.

Speaker: Mr Matteo Centis Vignali (University of Hamburg)

Slides presBTTBworkshop.pdf

12:30 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. The performance of the prototype sensors has been investigated in a testbeam 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. This allows several different tests of the performance of the sensor prototypes before and after irradiation. In this presentation a collection of preliminary results will be shown, 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 (27 MeV) protons at KIT in Karlsruhe and high energy (24 GeV) protons from IRRAD at CERN.

Speaker: Ms Elena Dall'Occo (NIKHEF)

Slides BTTB_Elena.pdf

12:50 → 13:00 Discussions

13:00 → 13:15 Feedback & closing session

Slides BTTB_Summary_Slides.pdf

13:15 → 14:45 Lunch