CERN-BINP workshop for young scientists in e+e- colliders

22 Aug 2016, 08:00 → 25 Aug 2016, 18:00 Europe/Berlin

Room Charpak, building 60, 6th floor (CERN)

The "CERN-BINP workshop for young scientists in e+e- colliders" is organised in the framework of the EU-funded CREMLIN project. The CREMLIN project aims at strengthening science cooperation between six Russian megascience facilities and related research infrastructure counterparts in Europe. BINP and CERN coordinate a dedicated CREMLIN work package focusing on a future super-charm-tau factory (SCT) at BINP. SCT aims at producing e+e- collisions with up to 5 GeV centre-of-mass energy and at very high luminosity. In parallel CERN is hosting design studies for two possible high-energy e+e- colliders: FCC-ee and CLIC. In matters of physics, design and technologies the BINP and CERN studies address technological and scientific questions of common interest. Similar issues are dealt with in the framework of other flavour factories and energy frontier e+e- colliders worldwide. The 3-day workshop provides young scientists (at the student and postdoc level) opportunities to present their work and exchange experiences. The program will be complemented with a series of lectures and various CERN site visits. Young scientists working on e+e- collider studies, whether flavour factories or energy frontier machines, are welcome to join.
The Registration Fee is 80 CHF - payable in cash at the registration desk.
Abstract submission is now closed; topical sessions:
• Accelerator design and technologies
• Detector design and technologies
• Physics and computing
Proceedings of the workshop will be published in the "CERN proceedings" series.
Workshop dinner Tuesday 23rd at the UN beach club: http://www.clubdelaplage.ch/   take your swim suits!

Poster eCOL-poster-ver.2.jpg

Monday, 22 August

1 Welcome, Introduction to CERN and to the EU Cremlin project.

Minutes group_alice.pdf groups_visits.pdf

Slides Linssen_CERN-BINP_workshop-introduction.pptx practical_petric.pdf

Lecture

2 Accelerator design for circular high-energy e+e- colliders

Speaker: Dr Frank Zimmermann (CERN)

Slides 160822_FCC_LeptonColliderDesign_FrankZimmermann.pptx

10:00 Coffee break

Young Scientists' Forum: Accelerator design and technologies

Convener: Dr Tomas Rogelio (CERN)

3 Towards a monochromatization scheme for direct Higgs production at FCC-ee

Direct Higgs production in e+e− collisions at the FCC is of interest if the centre-of-mass energy spread can be reduced by at least an order of magnitude. A monochromatization scheme, to accomplish this, can be realized with horizontal dispersion of opposite sign for the two colliding beams at the interaction point (IP). We recall histor- ical approaches to monochromatization, then derive a set of IP parameters which would provide the required performance in FCC e+e− collisions at 62.5 GeV beam energy, compare these with the baseline optics parameters at neighbouring energies (45.6 and 80 GeV), comment on the effect of beamstrahlung, and indicate the modifications of the FCC-ee final-focus optics needed to obtain the required parameters.

Speaker: Mr Marco Alan Valdivia García (CERN)

Slides Monochromatization_FCCee_220816.pdf

4 FCC-ee Pre-Booster Accelerators

CERN’s new ambitious project, Future Circular Collider-ee, will have 4 operations as Z, W, H and tt factories covering energy from 45.6 to 175 GeV. The main challenge of Z operation is to get high current as 1450 mA which will heavily depend on the injector. For this reason, we conclude that we need high bunch charge of 3.3E10 both for e- and e+, and fill 91500 of each of those bunches into the collider. In order to achieve the goal, we have designed an S-band (2.856 GHz) normal conducting electron linac up to 6 GeV, and we will use it alternatively both to create and accelerate electrons and positrons. Positrons will be created inside the linac at 5 GeV, and will be accelerated up to 1.54 GeV at the linac, and then will be transferred to the designed Damping Ring. In this study, we’d like to present the designed linac, damping ring, and the operational requirements of 100-km-booster.

Speaker: Mr Salim Ogur (CERN)

Slides SO-FCC_pre_inj.ppsx

5 Design Study of a Pre-Booster Damping Ring for the FCC e+e- Injector

The FCC-ee injector complex needs to produce and to transport a high-intensity e+/e- beam at a fast repetition rate of about 0.1 Hz for topping up the collider at its collision energy. A basic parameter set exists for all the collider energies, assuming a 10 GeV linac operating with a large number of bunches being accumulated in the existing SPS, which serves as pre-accelerator and damping ring before the bunches are transferred to the high-energy booster. The purpose of this study is to provide the conceptual design of an alternative damping & accelerator ring, replacing the SPS in the present scheme. This ring will have injection energy of around 6 GeV and extraction energy of around 30 GeV. Apart from establishing the basic parameters of the ring, the study work will include the optics design and layout, single particle linear and non-linear dynamics optimization, including magnetic and alignment error tolerances. The study will also contain some basic estimation of collective effects, including intra-beam scattering, single and multi-bunch instabilities and impedances, two-stream effects (e-cloud and ion instabilities) and address the issue of synchrotron radiation handling. In this presentation, as a part of these studies, basic parameters of the ring, optic design and layout will be presented.

Speaker: Mr özgür etisken (Ankara University)

Slides CERN_BINP_Geneva_2016_Final.pdf CERN_BINP_Geneva_2016_Final.pptx

vidyo https://indico.cern.ch/event/564014/

6 Comparative study of the tuning performances of the nominal and long L* CLIC BDS

Mitigation of static and dynamic imperfections for emittance preservation is one the most important and challenging task faced by the CLIC BDS. A simulations campaign has been performed in order to recover the nominal luminosity by means of different alignment procedures. The state of the art of the tuning studies is drawn up. Comparative studies of the tuning performances for the various design options is presented. The effectiveness of the tuning techniques applied to these different lattices will be decisive for the final layout of the CLIC FFS.

Speaker: Mr Fabien Plassard (CERN)

Slides eCOL16_v2.pdf

7 Beam tuning simulation for ATF2 low beta* optics

The nanometer beam size in the interaction point (IP) is required for future linear colliders in order to achieve the required rate of particle collisions. The goal of the ultra-low β∗ study is to lower the IP vertical beam size by lowering the βy* value. The experimental part of this project is being performed in KEK Accelerator Test Facility (ATF2) where the beamline design and conditions are analogous to the Beam Delivery System (BDS) of the future linear colliders. Stronger beam focusing makes the beam more sensitive to any imperfections like e.g. magnetic multipole fields and fringe fields. It also causes the second and third order optical aberrations to become more pronounced and more difficult to correct. Using the computer simulations we identify the most important aberrations and develop the mitigation methods, e.g. tuning knobs and use of the octupole magnets. The tuning simulations are compared with experimental results from ATF2.

Speaker: Mr Marcin Patecki (CERN)

Slides lowbeta_mpatecki_binp.pdf

12:00 Lunch

Visit

8 Antiproton Decelerator

9 LINAC4

10 CLIC

11 Computing Center

Lecture

12 Physics at high-energy e+e- colliders

Speaker: Dr Philipp Roloff (CERN)

Slides cern_binp_workshop_young_scientists_roloff.pdf

Young Scientists' Forum: Experiments and facilities

Convener: Dr Rickard Strom

13 The CLIC Detector Concept

CLIC is a concept for a future linear collider that would provide e+e- collisions at a centre-of-mass energy of up to 3 TeV. The physics aims require a detector system with excellent jet energy and track momentum resolution, highly efficient flavour-tagging and lepton identification capabilities, full geometrical coverage extending to low polar angles and timing information in the order of nanoseconds to reject beam-induced background. To deal with those requirements, an extensive R&D programme is in place. The CLIC detector concept includes a low-mass all-silicon vertex and tracking detector system and fine-grained calorimeters designed for particle flow analysis techniques, surrounded by a 4 T solenoid magnet. This talk provides an overview of the requirements and design optimisations for the CLIC detector concept as well as recent R&D activities on detector technologies.

Speaker: Mr Florian Pitters (CERN)

Slides talk_clicdet_binp_23_08_16.pdf

14 The Belle II Experiment

Set to begin data taking at the end of 2018, the Belle II experiment is the next-generation B-factory experiment hosted at KEK in Tsukuba, Japan. The experiment represents the cumulative effort from the collaboration of experimental and detector physics, computing, and software development. Taking everything learned from the previous Belle experiment, which ran from 1998 to 2010, Belle II aims to probe deeper than ever before into the field of heavy quark physics. By achieving an integrated luminosity of 50 [ab^-1] and accumulating 50 times more data than the previous experiment across its lifetime, along with a rewritten analysis framework and upgraded computing grid, the Belle II experiment will push the high precision frontier of high energy physics. This talk will give an overview of the key components and development activities that make the Belle II experiment possible.

Speaker: James Kahn (LMU München)

Slides talk_main.pdf

15 Fast Luminosity Monitoring and Beam Loss Studies at SuperKEKB in Japan

The SuperKEKB e+e- collider aims to reach a very high luminosity of 8 10^35 cm−2 s−1, using ultra-low emittance bunches colliding every 4ns and focused to unprecedented small vertical sizes thanks to a new "nano-beam" technique. Fast luminosity monitoring is required for luminosity feedback and optimisation in the presence of dynamic errors. The aimed relative precision is 10−3 in 1ms, which can be achieved thanks to the very large cross-section of the radiative Bhabha process at vanishing scattering angle. Diamond, Cherenkov and scintillator sensors are used just outside the beam pipe, downstream of the interaction point in both electron and positron rings, at locations with event rates sufficient for the aimed precision and small enough contamination from single-beam particle losses induced by Beam-gas Bremsstrahlung, Touschek and Coulomb scattering. The SuperKEKB fast luminosity monitoring project will be presented. The initial configuration installed for the 2016 "phase 1" single beam commissioning will be described. Preliminary measurements and analysis of beam loss data collected with the luminosity monitors will be reported and compared with a detailed simulation, for several experimental conditions during the SuperKEKB commissioning. Similar luminosity monitoring and beam loss issues as those described in our report exist for future e+e- high luminosity colliders such as FCC-ee, CEPC and SCT.

Speaker: Ms Dima El Khechen (LAL)

Slides CERN-BINP_elkhechen.pdf

17:00 Group Photo

17:05 Coffee break

Young Scientists' Forum: Calorimetry

Convener: Dr Andreas Maier (CERN)

16 Radiation hardness study of CsI(Tl) crystals for Belle II calorimeter

The Belle II calorimeter (at least, its barrel part) consists of CsI(Tl) scintillation crystals which have been used at the Belle experiment. We perform the radiation hardness study of some typical Belle crystals and conclude their light output reductions are acceptable for Belle II experiment where the absorption dose can reach 10 krad during the detector operation. CsI(Tl) crystals have high stability and low maintenance cost and are considered as possible option for the calorimeter of the future Super-Charm-Tau factory (SCT) at BINP. Our study also demonstrates sufficiently high radiation hardness of CsI(Tl) crystals for SCT conditions.

Speaker: Mr Dmitry Matvienko (BINP)

Slides matvienko.pdf

17 X-ray tomography using thin scintillator films

We developed method of thin scintillator films preparation based on thermal CsI(Tl) deposition on glass substrates. The influence of deposition conditions on the micro columnar structure and crystalline property of the films was studied by scattering electron microscopy. The element composition was investigated by X-ray fluorescence method. We measured light output and spacial resolution as a function of input photons energy (5-35 keV) and film thickness (2-20 mkm). It was observed the strong anti-correlations between the time of CsI(Tl) deposition, film light output and thallium concentration. The films can be used for charged particles beams monitoring as well as for X-ray imaging applications including micro tomography and topography.

Speaker: Mr evgeny kozyrev (Budker Institute of Nuclear Physics SB RAS)

Slides cern-binp2016.pdf

18 Development of the new spectrometric channel for the SND electromagnetic calorimeter

The Spherical Neutral Detector (SND) [1] is intended for study of electron-positron annihilation at the VEPP-2000 e+e- collider (BINP, Novosibirsk) [2]. The main part of the SND detector is a three-layer electromagnetic calorimeter (EMC). The EMC consists of 1640 counters. Each counter includes a NaI(Tl) crystal, a vacuum phototriode [3], and a charge-sensitive preamplifier. Currently the EMC electronics is being upgraded [4]. It is needed, in particular, to provide reliable detection of slow anti-neutrons produced in the e+e- → n anti-n reaction near threshold. The electronics must have the time resolution of about 1 ns or better [5] and good amplitude resolution. The new shaping module F12M has been developed to achieve optimal signal shape for best time and amplitude resolution. The new FADC module provides digitizing and processing of the measured oscillogram. The signal arrival time and amplitude are determined from the fit to the measured signal shape using a specially developed algorithm. The time resolution achieved is about 1 ns, while the amplitude resolution is about 250 keV. The developed approaches in electronics design and fitting algorithms may be used in calorimeter electronics of the detector for the Super c-tau Factory. References [1] M.N Achasov et al. Nuc. instr. Meth. A 449, 125 (2000); [2] D.E Berkaev et al. Journal of Experimental and Theoretical Physics 140, N2, 247 (2011); [3] V.V. Anashin et al. Nucl. Instr. and Meth. A 379, 522 (1996) [4] M.N Achasov et al. JINST (2015) 10 T06002 [5] A.A.Botov et al. Nucl. Phys. B, Proc. Suppl.162, 41 (2006)

Speaker: Mr Ilya Surin (Budker INP)

Slides Surin_cern_binp_slids_.pdf

19 Calorimetry at CMD-3

CMD-3 is a general purpose detector designed to study e+e− annihilation into hadrons. It is mounted at the VEPP-2000 collider which operates in the wide energy range, Ec.m.s=0.32−2GeV. The calorimetry at the detector is based on three subsystems: closest to the beam pipe barrel Liquid Xenon calorimeter, outer barrel calorimeter based on CsI scintillation crystals and the endcap calorimeter made of BGO scintillation crystals. The creation and operation experience of such calorimeters is valuable for design and development of coming detectors like one at the c-tau factory in Novosibirsk. We describe the structure of the calorimeters, their electronics and the energy calibration procedures with prospects to future calorimeters.

Speaker: Mr Georgii Razuvaev (BINP)

Slides CERN2016augPresentation.pdf

20 The liquid Xenon barrel calorimeter of the CMD-3 detector

ABSTRACT: The barrel calorimeter of CMD-3 detector consists of two subsystems, one of them being the internal calorimeter on the base of liquid xenon. The LXe-calorimeter consists of 14 layers of cylindrical ionization chambers with anode and cathode readout and allows one to measure precisely the coordinates of the point of the conversion of photon to an electron-positron pair. Another opportunity provided by LXe is a separation of kaons and pions using the information about ionization losses dE/dx in the LXe. In this report it will be shown that whereas the CMD-3's drift chamber allows one to separate single kaons and pions up to the momenta of particles of 450-500 MeV/c, LXe calorimeter allows to separate kaons and pions at momenta up to ~700 MeV/c, that is of particularly importance in studying of the K^{+}K^{-}\pi^{0} and K^{+}K^{-}\pi^{0}\pi^{0} final states.

Speaker: Vyacheslav Ivanov (BINP)

Slides Ivanov_LXe_CERN-BINP_workshop.pdf

21 The CMD-3 Data Acquisition System

The CMD-3 (Cryogenic Magnetic Detector) is the general purpose detector, designed for experiments at VEPP-2000. The detector includes a magnetic spectrometer, made of the drift chamber and multiwire proportional chamber, placed inside the 1.3 T magnetic field generated by thin superconducting solenoid, and an electromagnetic calorimeter, made of stacked liquid Xenon-based and CsI-based barrel calorimeters and BGO-based endcap calorimeter. The detector also includes the time-of-flight counters, placed between two barrel calorimeters, and the muon range system. A specialized data acquisition system is developed, designed, and fabricated for CMD-3 detector. The CMD-3 DAQ capacity is to process some about 10k channels with mean Trigger rate up to 5kHz thus producing about 3Gbps data rate. The special attention is devoted to synchronization of data transmission, and electronics efficiency on-line checks. The environment of signaling of synchronization and the data, named C-Link has been for this purpose specially developed. The present paper describes a specialized electronic system of the data acquisition (DAQ) system for precision experiments with the CMD-3 detector in the VEPP-2000 collider. The CMD-3 DAQ architecture can be used for a big installation DAQ, such as Super C-Tau Factory.

Speaker: Alexey Kozyrev (BINP)

Slides CMD3_DAQ_Fin2.pptx

Tuesday, 23 August

Lecture

22 Physics at tau-charm-beauty facilities

Speaker: Dr Sergey Serednyakov (Budker Institute of Nuclear Physics)

Slides Seredn_2016.pdf

09:30 Coffe break

Young Scientists' Forum: Physics

Convener: Iouri Tikhonov (BINP)

23 Quasiclassical approach and high energy QED processes in the field of a heavy atom

Method of quasiclassical Green's functions developed recently for the Dirac equation in the external fields of various configurations has allowed one to essentially advance the theoretical description of the fundamental quantum electrodynamical processes taking place at the interaction of high-energy particles with atoms. Novel results of the calculation, exact in the parameters of the atomic field, of the high-energy photoproduction, bremsstrahlung, double bremsstrahlung for electrons and muons, and others are surveyed. In many cases, the results are obtained in the quasiclassical approximation with the first quasiclassical correction taken into account. These results are important for data analysis.

Speaker: Peter Krachkov (BINP)

Slides Peter_Krachkov.pdf

24 Measurement of G_{ee}(J/\psi)*B(J/psi->hadrons) with KEDR detector at the VEPP-4M collider.

We report a new precise measurement of composition of electron partial width and branching fraction to hadrons G_ee*B(hadrons) for J/psi meson performed with the KEDR detector at the VEPP-4M e+e- collider. Lepton and total widths were calculated using table values of the J/psi lepton branching fractions . Experimental methods and techniques applied during this analysis can be then directly used within data treatment from super-charm-tau factory. For instance, J/psi selection and fit tools developed can be used for fast resonance scanning and luminosity and beam spread determination.

Speaker: Tatyana Kharlamova (BINP)

Slides kharlamova.pdf

25 BSM physics constraints from Higgs measurements at future e+ e- colliders

The primary goal of future e+ e- colliders could be measuring the Higgs property as precise as possible. If its deviations from SM are found, these deviations can give the hints of the BSM physics. The Higgs measurements can be used to constrain the BSM physics in two different ways: the model-independent EFT approach, and the model-dependent UV complete approach. In this talk, I will give two examples. In the first example, the angular observables in the e^+ e^- -> H Z -> b \bar{b} l^+ l^- productions at CEPC and FCC-ee are used to constrain the related dimension-6 EFT operators. Our results show that angular observables provide complementary sensitivity to rate measurements when constraining various tensor structures arising from new physics. In the second example, the Higgs coupling measurements at ILC and CEPC are used to constrain a UV complete natural SUSY model. A few interesting results will be shown.

Speaker: Dr Kechen Wang (DESY)

Slides BSM@FC_Kechen_10.pdf

26 Study of the conversion decays of omega meson into pi0 meson and e+e- pair with the CMD-3 detector

The interest in the decay omega -> pi0 e+ e- is related to the transition formfactors of the omega meson that can be measured in this decay. The precise value of the decay branching ratio can be useful for interpretation of experiments on quark-gluon plasma. The conversion decay omega into pi0 e+ e- has been studied at the energy range 720 — 840 MeV at the center of mass using about 10 1/pb of data recently collected with the CMD-3 detector at the VEPP-2000 accelerator in Novosibirsk. This data sample is three times larger than previously used at the former CMD-2. The visible cross section of the process omega -> pi0 e+ e- was measured. The preliminary branching ratio of this decay was determined. The status of the analysis will be presented.

Speaker: Anastasiya Kuzmenko (Budker Institute of Nuclear Physics)

Slides cern_binp2016_kuzmenko_eng.pdf

27 Luminosity measurement with the CMD-3 detector at the VEPP-2000 e+e- collider.

Since December 2010 the CMD-3 detector has taken data at the electron-positron collider VEPP-2000. The collected data sample corresponds to an integrated luminosity of 60 1/pb in the c.m. energy range from 0.32 up to 2 GeV. Preise luminosity measurement is a key issue for many experiments whih study the hadronic cross sections at e+e− colliders. The integrated luminosity of the collider was measured using two well known QED processes e+e−→e+e−, γγ. The preliminary results of the luminosity measurement are presented in the various energy range. The current accuracy of the luminosity determination is estimated to be 1%. The study of the different systematics is in progress now and in forthcoming future we hope to reduce it to the level of ~0.5%. These methods will be usefull for luminosity measurement at future e+e- super c-tau factory in Novosibirsk.

Speaker: Mr Artem Ryzhenenkov (Budker Institute of Nuclear Physics)

Slides ryzhenenkov_fcc2016-2.pdf

28 Silica fiber Cherenkov radiation monitor to study transverse beam tails in storage ring

We propose a new diagnostic tool to study transverse beam distribution in accelerator especially the regions with low particle population (beam halo, non-gaussian tails, etc.). The monitor key element is a silica fiber which scans the beam transversely. Beam particles hit the fiber and produce Cherenkov radiation which propagates along the fiber, moves out of the vacuum chamber through the glass windows and is registered by two photomultipliers. The monitor prototype was designed and installed at the VEPP-4M storage ring. First experiments with e+/e- beams have proved applicability and efficiency of this monitor.

Speaker: Daniil Voroshilov (BINP)

Slides Slides.pdf

12:00 Lunch

Lecture

29 Accelerator design for tau-charm-beauty facilities

Speaker: Prof. Evgeny Levichev (Budker Institute of Nuclear Physics)

Slides Levichev_ctaub_CERN.ppt

Young Scientists' Forum: Software and Computing

Convener: Marko Petric (CERN)

30 FCC software strategies and challenges

Computing plays an increasingly central role in modern HEP-experiments. Current reconstruction software solutions in particular will not scale to the demanding environment of future high-luminosity colliders and threaten to limit physics performance. This talk outlines the efforts to address this issue in the common software framework FCCSW of the Future Circular Collider design studies. FCCSW is built to account for changing hardware technologies and the complex software ecosystem from the beginning, using and adapting existing open-sourced HEP software when possible. Fast and full simulation approaches are integrated in the framework in a manner that is flexible in the treatment of pileup and beam background. Ideas and solutions that are of interest beyond FCC, such as PODIO, a new event data model library using plain old data structures, are highlighted.

Speaker: Mr Valentin Volkl (University Innsbruck)

Slides BINP-workshop-volkl-2308.pdf

31 Linear Collider software for event simulation to reconstruction

Software represents an essential aspect in the lifecycle of every experiment. Flexibility, shareability and an efficient use of resources are very important requirements to be addressed. In this talk, a general overview of the CLIC software chain is presented, including common developments with other linear collider experiments. A comprehensive introduction to the DD4hep tool-kit, a consistent and complete solution for detector description, will be given along with an overview of its interfaces to the simulation and reconstruction programs. The CLIC reconstruction chain from simple detector signals to physics object reconstruction will also be presented and benchmark performance results will be shown.

Speaker: Rosa Simoniello (CERN)

Slides rosa-lc-software-BINP-23aug2016.pdf

32 iLCDIRAC and CI: Automated testing for distributed jobs

Detector optimisation studies for future high energy physics experiments require the simulation and reconstruction of many physic processes and detector geometries. As an efficient way of accessing the necessary computational and storage resources, DIRAC has been developed and extended by iLCDirac, which is specialized for the applications used in the context of linear collider detector studies. This talk will give a brief introduction of (iLC)Dirac, grid computing and the philosophy of 'High-throughput Computing' behind it, and explain how we use continuous integration to ensure smooth day-to-day operations and that updates of the underlying code base do not cause an interruption of the service.

Speaker: Mr Jan Ebbing (CERN)

Slides CIILC_final.pdf CIILC_final.pptx

15:00 Coffe break

Young Scientists' Forum: Accelerator design and technologies

Convener: Dr John Jowett (CERN)

33 Beam energy measurement by resonant depolarization method

High precision measurement in high energy physics requires accurate knowledge of initial state of colliding particles. In particular, precise measurement of the mass of elementary particles requires precision measurement of the beam energy. For example, beam energy calibration system allow one to perform new measurement of tau lepton or psi meson masses at Super c-tau Factory. The most accurate method of beam energy calibration is resonant depolarization technique. It is based on measurement of spin precession frequency which is connected to Lorentz factor of the beam and well known normal and anomalous part of magnetic moment of electron due to Tomas precession. Spin precession frequency is determined from frequency of resonant destruction of beam polarization. My report is devoted to the experience of beam energy calibration of VEPP-4M collider by resonant depolarization method using polarimeter based on intra-beam scattering. The accuracy achieved is about 10^-6 and limited by width of spin line. Between energy calibrations beam energy is reconstructed by using NMR and temperature sensors of storage ring with accuracy 10-30 keV. Beam is depolarized by TEM wave which created by frequency synthesizer controlled by computer. The synthesizer is stabilized by rubidium frequency standard. Polarization degree is measured by intensity of process of intra-beam scattering. Scattered particles are registered by plastic scintillator counters located inside the accelerator vacuum chamber at different ring azimuth. Routine count rate is about 200 kHz/mA^2. We use a compensation technique by normalizing the counting rate from a polarized beam by the counting rate from an unpolarized one. This technique allows us to suppress count rate fluctuations related to the beam orbit or beam size instabilities. More then thousand energy calibrations were used in the KEDR detector precise experiments on measurement of J/psi, psi(2S), psi(3770), D+, D0 mesons and tau lepton masses.

Speaker: Mr Ivan Nikolaev (Budker Institute of Nuclear Physics)

Slides Beam energy measurement by resonant depolarization method

34 Fast and Precise Beam Energy Measurement Using Compton Backscattering at e+e- Colliders

The report describes a method for a fast and precise beam energy measurement in the beam energy range 0.5-2 GeV and its application at various e+e- colliders. Low-energy laser photons interact head-on with the electron or positron beam and produce Compton backscattered photons whose energy is precisely measured by HPGe detector. The method allows measuring the beam energy with relative accuracy of ~20...5e-6. The method was successfully applied at VEPP-4M, VEPP-3, VEPP-2000 (BINP, Russia) and BEPC-II (IHEP, China).

Speaker: Mr Viacheslav Kaminskiy (Budker Institute of Nuclear Physics, Novosibirsk, Russia)

Slides Kaminskiy_CBS.pdf

35 High field studies for CLIC accelerating structures development

The Compact Linear Collider (CLIC) is one of the candidates for next generation high energy linear colliders. In order to reach up to 3 TeV and maintain an acceptable length, the accelerating gradient must be above 100 MV/m. This results in surface electric fields of more than 200 MV/m on the copper surface of the structure. With such fields vacuum breakdowns with some probability occur and disrupt the accelerated beam. Breakdowns are one of the main performance limitations for CLIC and other high-gradient linacs. Whenever a breakdown happens, it results in partial or full loss of luminosity for that pulse. Obtaining a low breakdown rate (3E-7 breakdown per pulse per meter) in CLIC accelerating structures is a critical requirement for the successful it operation. For understanding breakdown phenomena and for finding the best materials, treatment methods and study the conditioning process for accelerating structures of future colliders several DC-spark systems undergoing at CERN. Pulsed DC system, its opportunity, results and future plans will be present.

Speaker: Ms Iaroslava Profatilova (CERN/Institute of Aplied Physics NASU)

Slides 2016_08_23_Profatilova_CERN_BINP_Workshop.pptx

36 Investigation of beam halo at the Accelerator Test Facility of KEK (Japan)

Beam halo in e+e- colliders can induce significant beam loss and serious backgrounds for the experimentation, thereby significantly limiting performances. Understanding the formation mechanisms and behavior of halo particles and how to suppress them requires both modeling and measuring the tails of the beam distribution near the Interaction Point (IP). Here, we present modeling and experimental studies of beam halo performed at the Accelerator Test Facility (ATF) in Japan, as well as performance optimization of an "in vacuum" diamond sensor scanner installed after the IP to measure horizontal and vertical beam core and halo distributions.

Speaker: Mr Renjun YANG (LAL)

Slides CERN_Workshop_2016.pdf

37 Going to the Bus

Minutes tuesday_visits.pdf

Visit

38 ALICE

39 AMS experiment

40 Magnet Facility

41 CERN Control Center

42 Experimental Hall, EHN1

Workshop dinner at UN beach club http://www.clubdelaplage.ch/ take your swim suits!

Wednesday, 24 August

Lecture

43 LHC Experiments: Status and plans

Speaker: Kerstin Borras (DESY)

Slides 2016-08-24-CERN-BINP_v1.pdf

09:30 Coffe break

Young Scientists' Forum: Accelerator design and technologies

Convener: Prof. Evgeny Levichev (Budker Institute of Nuclear Physics)

44 Injection - extraction systems for e+e- storage rings.

The injection of the charge beams into storage ring is a task for choosing scheme which allows to make injection of the beam to the storage ring without kick out of the accumulated beam. This can be done using the fast kicker system. Kicker system consists of the fast kicker magnets, high-voltage pulse generators, transmission lines and matching loads. High peak power and pulse energy is a property of the operating mode of such systems. The BINP experience of kicker maintenance for one-turn injection and extraction beams will be described.

Speaker: Aleksey Kasaev (Budker Institute of Nuclear Physics)

Slides Injection_-_extraction_systems.pptx

45 Low energy electron cooler for NICA Booster

BINP has developed an electron cooler to increase the ion accumulation efficiency in the NICA heavy ion collider booster (JINR, Dubna). Adjustment of the cooler magnetic system provides highly homogeneous magnetic field in the cooling section B trans/B long ≤ 4∙10 -5 which is vital for efficient electron cooling. First experiments performed at BINP demonstrated the target current of 200 mA for cooling ions with injection energy of 3.2 MeV/u.

Speaker: Andrey Denisov (Budker Institute of Nuclear Physics)

Slides Denisov_CERN_workshop_02.pptx

46 Niobium Thin Film Technology for Superconducting RF Cavities

Synchrotron radiation losses are one of the main limitations for circular e+e- accelerators and require hence a large radio-frequency (RF) power system. For continuous wave (cw) operation the use of superconducting RF cavities comes with significant savings in power consumption despite the costs of cryogenics. Furthermore, the niobium thin film technology which has been developed at CERN and is pursued at different laboratories around the world today has several advantages over the standard bulk niobium technology and further reduces installation as well as operation costs. This talk gives an overview over the niobium thin film technology for superconducting RF cavities, its advantages, limitations and possible application for future cw e+e- machines.

Speaker: Sarah Aull (CERN)

Slides 2016-08-24_CERN-BINP_WS_AullSarah.ppsx

47 Design study of CEPC Alternating Magnetic Field Booster

CEPC is next generation circular collider proposed by China. The design of the full energy booster ring of the CEPC is especially challenging. The ejected beam energy is 120GeV but the injected beam only 6GeV. In a conventional approach, the low magnetic field of the main dipole magnets creates problems. We propose to operate the booster ring as a large wiggler at low beam energies and as a normal ring at high energies to avoid the problem of very low dipole magnet fields.

Speaker: Mr Tianjian Bian (Institute of High Energy Physics (IHEP))

Slides booster_workshop_Swiss.ppt

48 Synchrotron radiation beam diagnostics at BINP

Synchrotron radiation is widely used at BINP colliders for e+e- beams parameters measurement. Progress and results of optical diagnostic tooling are discussed including new-generation dissector with picosecond resolution.

Speaker: Viktor Dorokhov (Budker Institute of Nuclear Physics (BINP))

Slides Development_of_optical_diagnostics_system_SR_source.pptx

49 Application of a Low-Energy Electron Beam as a Tool for ultrashort bunch length measurement in circular machines.

The aim of this report is to give general information about the device which is called Electron Beam Probe (EBP). In this study low energy electron beam is used as a tool for non-destructive length measurement of high-energy sub-picoseconds electron bunches in circular machines.

Speaker: Mr Danila Nikiforov (BINP)

Slides Electron_beam_probe.pptx

12:00 Lunch

Visit

50 Antiproton Decelerator

51 LINAC4

52 CLIC

53 Computing Center

Young Scientists' Forum: Tracking and particle ID detectors

Convener: Eva Sicking (University of Freiburg)

54 Tracking system of CMD-3 detection and kaon identification.

The detector tracking system consists of the cylindrical drift chamber (DC) and double-layer cylindrical multi-wire proportional Z-chamber, both used for a trigger, and both are installed inside thin (0.2 X_{0}) superconducting solenoid with 1.3T field. DC contains 1218 hexagonal cells and allows to measure track parameters with high accuracy (a momentum resolution - 1.5-4.5% for 200-1000 MeV/c momentum, an angular resolution - σ_{φ} = 8−3.5 mrad and σ_{θ} = 20 mrad) as well as specific ionization (σ_{dE/dx}=11-14%). The coordinate along the wire is measured by charge division technique. Z-chamber provides z-coordinate determination of the tracks with accuracy ∼ 0.5 mm by measuring the cathode strip information. The signals coming from anode sectors are used for the first level trigger and have time jitter ∼ 5 ns. The ionization losses of pions and kaons in the DC are used for procedure of K/π-separetion. The separation is based on probability density functions for kaons and pions. This method is developed using events of the process e+e- -->K+K-pi+pi-.

Speaker: Mr Dmitry Shemyakin (Budker Institute of Nuclear Physics)

Slides Shemyakin_CERN-BINP.pdf

55 Vertex and tracker research and development for CLIC

The requirements for high precision measurements at the CLIC e+e− collider impose tight performance criteria on the vertex detector and tracking system. A single point resolution of 3μm in the vertex and 7μm in the tracker needs to be achieved. Moreover, the vertex and tracker have to be ultra-low mass detectors with a material budget of ∼0.2% X0 per layer in the vertex and ∼1% X0 per layer in the tracker, leading to the adoption of a forced air-flow cooling in the vertex detector. To further reduce power consumption, power pulsing of the front end electronics is investigated. In addition, the high rate of beam-beam interactions requires fast time-stamping of ∼10ns. An all-silicon vertex and tracking system is currently being investigated for CLIC, addressing the above criteria. Highly granular hybrid pixel detectors with analogue readout are under evaluation for the vertex detector. The CLICpix readout ASIC, produced in 65nm technology with a pixel pitch of 25μm, has been fabricated and tested. Prototypes of the CLICpix readout ASIC have been bump bonded to planar sensors and capacitatively coupled to active High-Voltage-CMOS sensors. Moreover, Timepix3 ASICs have been bump bonded to thin edgeless planar sensors. The achieved resolution and timing results from test-beam data are compared to the detector needs at CLIC. In addition, pulsed power operation has been tested using Timepix3 assemblies. Simulations of the different technologies have been set up and are compared to the results of the test-beam studies. For the tracker fully integrated readout technologies are considered. To study the feasibility of a 180nm CMOS process, an investigator chip from the ALICE collaboration has been characterised in the CLIC test-beam setup and the analogue performance has been assessed. Engineering studies have also been performed, addressing the construction of a low material support structure for both vertex and tracking detectors and air-flow cooling of the vertex detector.

Speaker: Magdalena Munker (CERN / University of Bonn)

Slides munker_binp.pdf munker_binp.pptx

56 GEM detectors in the experiments at e+e- colliders in BINP

Micro-pattern gaseous detectors, on the one hand, possess a high spatial resolution in tens micron scale together with high rate capability and, on the other hand, they have all advantages of gaseous detectors, such as relatively low cost per unit area, possibility of large area coverage as well as a uniform and cheap gas converter. These detectors are considered as possible candidates for a number of tracking systems of the future Super c-tau factory experiment and, thus, this technology might be very promising. Cascaded Gas Electron Multiplier (GEM) based detectors are used in the collider experiments at the Budker Institute of Nuclear Physics, and being developed for a number of new projects. The system of 8 triple-GEM detectors is under operation at the tagging system of the KEDR experiment at the VEPP-4M collider since 2010. The detectors allow for tracking accuracy of about 70 microns and have no losses of efficiency at the local rate up to 1 MHz per squared cm. New triple-GEM detectors with a very low material budget of about 0.25% X0 have been developed for the DEUTRON facility at the VEPP-3 storage ring. These detectors have demonstrated spatial resolution better than 50 microns with 1 GeV electrons. The upgrade of the tracking of the CMD-3 detector is planned based on cascaded GEMs. The development of the end-cup discs and central cylindrical chamber is being started. The discs will be based on the triple-GEM cascade and will have diameter of 50 cm. The design of the cylindrical chamber is under discussion and it will be probably based on the new micro-pattern structure, resistive micro-WELL. It will have diameter of more than 60 cm and will be about 60 cm long.

Speaker: Mr Timofei Maltsev (Budker Institute of Nuclear Physics)

Slides GEMs_CERN-BINP_workshop_2016.pdf

57 FARICH detector for the Super Charm-Tau factory in Novosibirsk

FARICH (Focusing Aerogel RICH) technique based on non-homogenious 'focusing' aerogel radiator has been being developed in BINP since 2004. It is proposed for implementation in the PID system of the detector of the Super Charm-Tau factory in Novosibirsk. It should cover near 4pi solid angle and separate muons and pions with momentum from 500 to 1500 MeV/c. Idea of the FARICH method is described. Conceptual design of the system is presented. Results of the prototype beam tests are presented. Status of the focusing aerogel technique research is described. Promising photodetection systems are discussed.

Speaker: Dr Alexander Barnyakov (BINP)

Slides FARICH_SCTfactory_BINP_CERN.pdf FARICH_SCTfactory_BINP_CERN.ppt

58 Aerogel Cherenkov counters of the KEDR detector

Particle identification system of the KEDR detector based on aerogel threshold Cherenkov counters ASHIPH (Aerogel SHifter PHotomultiplier). In 2014 the fully installed ASHIPH system began its operation in the KEDR experiment at the VEPP-4 M e+e--collider. The system contains 1000 liters of aerogel with the refractive index n=1.05. 160 counters are arranged in two layers and cover 96% of total solid angle. Micro-Channel Plate (MCP) PMTs with multialkali photocathode are used as photodetectors. Cherenkov light collection is performed by means of wavelength shifters (WLS). ASHIPH system gives a possibility to separate pi- and K-mesons with momenta from 0.6 to 1.5 GeV/c. The high voltage supply system based on active HV dividers from PNPI (St. Petersburg) and slow control system have been developed. The data acquisition system has been developed for the two layers of the ASHIPH system. The position of each counter relatively to the tracking system was determined on BhaBha events and cosmic muons with accuracy about 1 mm. The event reconstruction program for the ASHIPH system was developed. The geometric efficiency of the system ASHIPH was verified with BhaBha events. Efficiency of relativistic particles detection was measured with cosmic muons and is equal (1-(7+-1)*10^-3). π/K-separation of 4σ at the momentum1.2GeV/c was obtained. The operation experience and parameters of the ASHIPH system confirm the possibility to use such counters as PID system at Super Charm-Tau Factory.

Speaker: Mr Ivan Ovtin (Budker Institute of Nuclear Physics)

Slides ovtin_cern-binp.pdf

16:40 Coffe Break

Young Scientists' Forum: Accelerator design and technologies

Convener: Dr Sergey Serednyakov (Budker Institute of Nuclear Physics)

59 Dynamical Aperture Control in Accelerator Lattices With Multipole Potentials

We apply two analytical methods to control accelerator dynamic aperture with multipole potentials. Both methods assume that accelerator model is represented as a product of unperturbed and perturbed exponential operators with exponent of perturbed operator given as formal power series in perturbation parameter. Normal form method can be applied to the above representation and then the lattice parameters are used to control normal form Hamiltonian coefficients. Hamiltonian can be used to compute control term. The lattice parameters are fitted to approximate corresponding controlled operator.

Speaker: Ivan Morozov (Budker INP)

Slides ivan_morozov_cern_2016.pdf

60 CEPC Partial Double Ring Lattice Design and SPPC Lattice Design

In this paper, we introduced the layout and lattice design of Circular-Electron-Positron-Collider (CEPC) partial double ring (PDR) scheme. The baseline design of CEPC is a single beam-pipe electron positron collider, which has to adopt pretzel orbit scheme. And it is not suitable to serve as a high luminosity Z factory. If we choose partial double ring scheme, we can get a higher luminosity with lower power and be suitable to serve as a high luminosity Z factory. We discussed the details of CEPC partial double ring lattice design and showed the dynamic aperture study and optimization. We also showed the first version of SPPC lattice and the beam dynamics study.

Speaker: Mr Feng Su (Institute of High Energy Physics(IHEP),CAS)

Slides 2_CEPC_Partial_Double_Ring_Lattice_Design_and_SPPC_Lattice_Design-SU_Feng.pdf

61 Fast Kicker for High Current Beam Manipulation in Large Aperture

Pulsed deflecting magnet is under development at BINP with the following parameters: the field strength is 1 mT*m in the 5 cm aperture, rise/fall time is <15 ns, and the pulse duration is about 200 ns. In our design the wire electrodes are used instead of conventional plate electrodes. A low magnet inductance provides short the rise/fall time. The report describes the magnet development, production and field measurement.

Speaker: Mr Vaagn Gambaryan (Budker Institute of Nuclear Physics)

Slides Gambaryan

62 Increase of dynamic aperture limited by sextupoles with the help of octupoles

Sextupoles compensate the linear chromaticity in storage ring and limit a dynamic aperture by moving betatron tunes for particle with non-zero amplitude toward resonance. We consider possibility of nonlinear defining correction and dynamic aperture increase by octupoles.

Speaker: Ms Kseniia Kariukina (BINP)

Slides Kariukina.pptx

63 Realistic approach for beam dynamics simulation with synchrotron radiation in high energy circular lepton colliders

In extremely high energy circular lepton collider correct consideration of synchrotron radiation is important for beam dynamics simulation. We developed fast, precise and effective method to track the particles in realistic lattice when the radiation effects are distributed along the orbit. As an example we study beam dynamics in the FCC-ee lepton collider.

Speaker: Mr Sergey Glukhov (BINP)

Slides Glukhov_slides.ppt

64 Using of non-uniform bending magnets for emittance reduction in electron storage ring

Bending magnet with transverse and longitudinal gradient of magnetic field allows reduction of the beam emittance against the uniform field dipole. We study effect of the field variation in bending magnet on minimum emittance in electron storage ring. We compare theoretical results with computer simulation.

Speaker: Grigory Baranov (Budker Institute of Nuclear Physics,Novosibirsk State Technical University)

Slides Baranov_Grigory.pptx

65 VEPP-2000 collider control system: operational experience.

VEPP-2000 was commissioned and spent three successful runs 2010-2013. During operation experience of maintenance and continuous updates was acquired. Strong cooperation between accelerator complex operators and control system developers helps to provide necessary changes in short time.

Speaker: Mr Alexander Senchenko (BINP)

Slides senchenko_cremlin_binp.pdf

Thursday, 25 August

EU Cremlin Project - management meeting

66 Introduction to Cremlin milestones and deliverables for Work Package 7

Speaker: Lucie Linssen (CERN)

Slides CERN-BINP_deliverables-milestones.pptx

67 Discussion on Deliverable 7.2 (task 7.1): “Overview report on technological requirements and R&D progress”

68 Milestone 7:2 (task 7.3): Creation of a Cremlin data management platform for lepton colliders - input from BINP

69 Milestone 7:2 (task 7.3): Creation of a Cremlin data management platform for lepton colliders - input from CERN

Speaker: Marko Petric (CERN)

70 Discussion and conclusion on work plan for Milestone 7.2 (task 7.3)

71 AOB

Visit

72 Visit to Microcosm

73 Visit to GLOBE