tipp2014 February 2014

tipp2014@nikhef.nl

28 participants
340 discussions

[Tipp2014] [Indico] New abstract submission:
by noreply-indico-team＠cern.ch 28 Feb '14

28 Feb '14

The following email has been sent to : === Dear , The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts>. Status of your abstract: <https://indico.cern.ch/event/192695/call- for-abstracts/342/>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: Submitted on: 28 February 2014 14:07 Title: CITIROC : a new front-end ASIC for SiPM read-out Abstract content Citiroc is a 32-channel front-end ASIC designed to readout silicon photo-multipliers (SiPM). Citiroc allows triggering down to 1/3 pe and provides the charge measurement with a good noise rejection. Moreover, Citiroc outputs the 32-channel triggers with a high accuracy (100 ps). An adjustment of the SiPM high-voltage is possible using a channel-by-channel DAC connected to the ASIC inputs. That allows a fine SiPM gain and dark noise adjustment at the system level to correct for the non-uniformity of SiPMs. Timing measurement down to 100 ps RMS jitter is possible along with 1% linearity energy measurement up to 2500 p.e. The power consumption is about 2mW/channel, excluding ASIC outing buffer Summary Citiroc is a new ASIC designed by Weeroc, a start-up company from the Omega microelectronics group of IN2P3/CNRS. Each channel of this new ASIC embeds a front-end read-out chain composed of two AC-coupled voltage low-noise preamplifier with variable-gain adjustment. The utility of the gain tuning on the preamplifiers is twofold. On the first hand it allows to compensate non-uniformity between channels by finely adjusting gain channel by channel, on the second hand, it allows to adjust the general gain of the amplification chain to adjust the read-out chain to the SiPM gain, allowing a large choice of SiPM on the system to be used. Citiroc has a new channel-by-channel trigger chain composed of a fast shaper followed by two discriminators with individual channel-by-channel threshold adjustment to be able to trig on the first photo-electron and validate the trigger on the first few photoelectrons. That double trigger allows a great dark noise rejection at the first stage of the read-out chain and avoids saturating the DAQ with noise events. Each trigger channel can be masked in case of noisy channel, latched, or output the discriminator output as is depending on user needs. A general ASIC trigger is also outputted through a 32-input trigger OR. Citiroc energy measurement is composed of two variable-gain shapers to get energy measurement from one to 2500 photoelectron with 1% linearity. Charge proportional to energy can be stored in an analogue memory using either an analogue memory or a peak-sensing detector to get rid of the hold signal versus trigger delay. A channel-by-channel input DAC allows adjusting the high voltage of the SiPM over 5V with 8-bit resolution to correct for SiPM over-voltage non-uniformity. Citiroc outputs 32 trigger outputs as well as a multiplexed tri-state hit-register to allow several Citiroc to be serialized on a single hit-register serial bus. Citiroc outputs two multiplexed analogue outputs to read-out the charge on both low and high gain to ease the low-gain and low-gain channel inter-calibration. Citiroc also embed a general 10-bit DAC for coarse general threshold adjustment. Voltage references in the ASIC are done with a bandgap to improve power supply rejection ratio and temperature sensitivity of the ASIC. Citiroc is aimed to be mounted very close to the SiPM in the systems it will be used in. A temperature sensor has been embedded to allow users to finely sense the temperature within their multi-channel system to correct for SiPM gain over voltage adjustment with temperature. As a conclusion Citiroc has been designed to be as versatile as possible for SIPM read-out. It is aimed to be used in large system and has been optimized to ease the SiPM adjustment and reduce has much as possible the data flow through the DAQ by filtering the SiPM noise at the front-end level. Citiroc will be used in a first telescope prototype for the CTA experiment and is aimed to be used in medical systems such as PET or gamma cameras using SiPM. A test board with ergonomic GUI software is available for Citiroc evaluation. Primary Authors: DE LA TAILLE, Christophe (OMEGA/IN2P3) <taille(a)in2p3.fr> FLEURY, Julien (Weeroc) <julien.fleury(a)weeroc.com> Ms. SEGUIN-MOREAU, Nathalie (OMEGA/IN2P3) <nsmoreau(a)in2p3.fr> Mr. RAUX, Ludovic (OMEGA/IN2P3) <ludovic.raux(a)weeroc.com> Mr. CALLIER, Stéphane (OMEGA/IN2P3) <stephane.callier(a)weeroc.com> Dr. MARTIN CHASSARD, Gisele (OMEGA/IN2P3) <gisele.martin(a)weeroc.com> AHMAD, Salleh (Weeroc SAS) <salleh.ahmad(a)weeroc.com> Co-authors: CATALANO, Osvaldo (INAF) <catalano(a)ifc.inaf.it> Abstract presenters: FLEURY, Julien Track classification: Experiments: 2b) Astrophysics and Space Instrumentation Data-processing: 3a) Front-end Electronics Technology transfer: 5a) Industry Liaisons Technology transfer: 5b) Health and healthcare Presentation type: Oral Comments:

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[Tipp2014] [Indico] New abstract submission: KIRBY, Brian
by noreply-indico-team＠cern.ch 28 Feb '14

28 Feb '14

The following email has been sent to KIRBY, Brian: === Dear Brian Kirby, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts>. Status of your abstract: <https://indico.cern.ch/event/192695/call- for-abstracts/341/>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: KIRBY, Brian Submitted on: 28 February 2014 14:06 Title: Particle Identification with the Belle II TOP Counter Abstract content The Time-of-Propagation (TOP) Chrenkov ring-imaging counter is a particle identification system designed for use in the barrel region of the Belle II spectrometer. The system detects Cherenkov photons produced by charged particles passing through one of 16 quartz bars arranged in a barrel around the inner tracking detectors. An array of 32 pixelated micro-channel plate photomultipliers (MCP-PMTs) instrument each bar to detect internally reflected photons with time resolution better than 50ps. A waveform sampling ASIC-based frontend readout electronics system digitizes and measures photon detection times. Photon time information is combined with tracker data to reconstruct the charged particle’s Cherenkov ring image for use in particle identification analysis. The ability to distinguish between kaons and pions with high sensitivity will be crucial in many Belle II physics measurements. This presentation will describe the TOP detector design and application in physics analyses, and summarize current detector development activities and plans leading up to installation in early 2015. Summary Primary Authors: KIRBY, Brian (University of Hawaii at Manoa) <kirbybri(a)phys.hawaii.edu> Co-authors: Abstract presenters: KIRBY, Brian Track classification: Sensors: 1d) Photon Detectors Presentation type: Oral Comments:

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[Tipp2014] [Indico] New abstract submission: KUEHN, Susanne
by noreply-indico-team＠cern.ch 28 Feb '14

28 Feb '14

The following email has been sent to KUEHN, Susanne: === Dear Susanne Kuehn, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts>. Status of your abstract: <https://indico.cern.ch/event/192695/call- for-abstracts/340/>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: KUEHN, Susanne Submitted on: 28 February 2014 13:16 Title: Silicon Sensors for High-Luminosity Trackers – RD50 Status Report Abstract content The revised schedule for the LHC upgrade foresees a significant increase of the luminosity of the LHC by upgrading towards the HL-LHC (High Luminosity-LHC). The final upgrade is planned for around 2023, followed by the HL-LHC running. This is motivated by the need to harvest the maximum physics potential from the machine. It is clear that the high integrated luminosity of 3000 fb-1 will result in very high radiation levels, which manifest a serious challenge for the detectors. This is especially true for the tracking detectors installed close to the interaction point. For HL-LHC, all-silicon central trackers are being studied in ATLAS, CMS and LHCb, with extremely radiation hard silicon sensors to be employed in the innermost layers. Within the RD50 Collaboration, a massive R&D program is underway, with an open cooperation across experimental boundaries to develop silicon sensors with sufficient radiation tolerance. One research topic is to study sensors made from p-type silicon bulk, which have superior radiation hardness as they collect electrons instead of holes. A further area of activity is the development of advanced sensor types like 3D detectors designed for the extreme radiation levels expected for the inner layers. We will present results of several detector technologies and silicon materials at radiation levels corresponding to HL-LHC fluences. Observations of charge multiplication effects at very high bias voltages in a number of detectors will be reported. Based on our results, we will give recommendations for the silicon detectors to be used for LHC detector upgrades. Summary Primary Authors: KUEHN, Susanne (Albert-Ludwigs-Universitaet Freiburg (DE)) <susanne.kuehn(a)cern.ch> Co-authors: Abstract presenters: KUEHN, Susanne Track classification: Sensors: 1b) Semiconductor Detectors Presentation type: Oral Comments: This abstract is submitted on behalf of the RD50 Collaboration, therefore not all co-authors are listed!

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[Tipp2014] [Indico] New abstract submission: GRIESMAYER, Erich
by noreply-indico-team＠cern.ch 28 Feb '14

28 Feb '14

The following email has been sent to GRIESMAYER, Erich: === Dear Erich Griesmayer, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts>. Status of your abstract: <https://indico.cern.ch/event/192695/call- for-abstracts/339/>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: GRIESMAYER, Erich Submitted on: 28 February 2014 13:02 Title: Diamond Detectors for beam instrumentation Abstract content Diamond is perhaps the most versatile, efficient and radiation tolerant material available for use in beam detectors with a correspondingly wide range of applications in beam instrumentation. Numerous practical applications have demonstrated and exploited the sensitivity of diamond to charged particles, photons and neutrons. In this presentation, emphasis will be given to fast beam loss monitoring at the LHC and to neutron detection, where diamond can potentially be used as an He-3 replacement. Summary Diamond detectors have proven to be useful as fast beam loss instrumentation. At the LHC bunch-by-bunch losses are resolved and lead to new insight into the behaviour of the accelerator. Recent research has shown that diamond is also a proper candidate for neutron detection, where it proves to be a potential candidate to replace He-3 in the future. Primary Authors: Dr. ERICH, Griesmayer (CIVIDEC Instrumentation) <erich.griesmayer(a)cividec.at> Co-authors: Mr. KAVRIGIN, Pavel (CIVIDEC) <pavel.kavrigin(a)cividec.at> Abstract presenters: Dr. ERICH, Griesmayer Track classification: Sensors: 1b) Semiconductor Detectors Sensors: 1e) Novel technologies Presentation type: Oral Comments:

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[Tipp2014] [Indico] New abstract submission: Dr. PAPANESTIS, Antonis
by noreply-indico-team＠cern.ch 28 Feb '14

28 Feb '14

The following email has been sent to Dr. PAPANESTIS, Antonis: === Dear Antonis Papanestis, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts>. Status of your abstract: <https://indico.cern.ch/event/192695/call- for-abstracts/338/>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: Dr. PAPANESTIS, Antonis Submitted on: 28 February 2014 12:58 Title: The RICH detector of the LHCb experiment Abstract content The LHCb experiment was fully operational during the Run 1 of the Large Hadron Collider in the period 2009-2013, collected more than 3 fb$^{-1}$ of data and has produced many world first and world best measurements. The RICH system is an integral part of LHCb proving hadron identification in the momentum range of 2-100 GeV/c. The ability to separate pions and kaons in this wide momentum range is essential for the physics measurements of LHCb. The LHCb RICH system consists of two RICH detectors with three different radiators. The optical systems are made from a total of 116 mirrors (four constructed out of low mass carbon fibre) and single photon detection is achieved by 484 Hybrid Photon Detectors (HPD). The RICH detectors have been aligned and calibrated using the LHCb data and their performance evaluated using pure particle samples collected without RICH information. The performance of the RICH detectors in a high multiplicity hadron environment is excellent. The LHCb experiment is preparing for a significant upgrade during the Long Shutdown 2 of the LHC. There are advanced plans to modify the existing layout in order to conserve the current particle identification performance despite the increase in luminosity by a factor five. The alignment, calibration and performance of the LHCb RICH system will be presented, together with a few example analyses showing the contribution of the RICH. The plans for the LHCb RICH upgrade will also be presented. Summary Primary Authors: Dr. PAPANESTIS, Antonis (STFC - Rutherford Appleton Lab. (GB)) <antonis.papanestis(a)stfc.ac.uk> Co-authors: Abstract presenters: Dr. PAPANESTIS, Antonis Track classification: Experiments: 2a) Experiments & Upgrades Presentation type: Oral Comments:

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[Tipp2014] [Indico] New abstract submission: KARADZHINOVA, Aneliya
by noreply-indico-team＠cern.ch 28 Feb '14

28 Feb '14

The following email has been sent to KARADZHINOVA, Aneliya: === Dear Aneliya Karadzhinova, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts>. Status of your abstract: <https://indico.cern.ch/event/192695/call- for-abstracts/337/>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: KARADZHINOVA, Aneliya Submitted on: 28 February 2014 12:45 Title: Characterization of Ni/SnPb-TiW/Pt Flip Chip Interconnections in Silicon Pixel Detector Modules Abstract content In contemporary high energy physics experiments, silicon detectors are essential for recording the trajectory of new particles generated by multiple simultaneous collisions. To guarantee high sensitivity near the collision point, modern particle tracking systems may feature 100 million channels, or pixels, which need to be individually connected to read-out chains. Silicon pixel detectors are typically connected to readout chips by flip-chip bonding using solder bumps. The electrical and mechanical quality of the flip-chip interconnects are important for the proper functioning of the particle tracking system in order to minimize the number of dead read-out channels. Furthermore, the detector modules must be robust enough to endure the handling during the installation and the heat generation and the cooling during the operation. The silicon pixel detector modules were constructed by flip chip bonding 16 readout chips to a single sensor. Eutectic SnPb solder bumps were deposited on the readout chips and the sensor chips had TiW/Pt thin film UBM (under bump metallization). The modules were assembled at Advacam Ltd operating at Micronova Nanofabrication Centre. We studied the quality and uniformity of the interconnections using Scanning White Light Interferometry (SWLI), stylus profiler and performing destructive pull-strength tests. Furthermore, we compared the results of the characterization of interconnections to those of module performance measurements. According to our results, the Ni/SnPb-TiW/Pt interconnections are excellent for flip-chip bonding pixel detector modules. Summary Primary Authors: Ms. KARADZHINOVA, Aneliya (Helsinki Institute of Physics, PO Box 64, 00014, Helsinki, Finland) <aneliya.karadzhinova(a)helsinki.fi> Co-authors: Mr. NOLVI, Anton (Department of Physics, University of Helsinki, PO Box 64, 00014, Helsinki, Finland) <anton.nolvi(a)helsinki.fi> Dr. HÄRKÖNEN, Jaakko (Helsinki Institute of Physics, PO Box 64, 00014, Helsinki, Finland) <jaakko.haerkoenen(a)cern.ch> Dr. LUUKKA, Panja (Helsinki Institute of Physics, PO Box 64, 00014, Helsinki, Finland) <panja.luukka(a)cern.ch> Dr. MÄENPÄÄ, Teppo (Helsinki Institute of Physics, PO Box 64, 00014, Helsinki, Finland) <teppo.maenpaa(a)helsinki.fi> Dr. TUOMINEN, Eija (Helsinki Institute of Physics, PO Box 64, 00014, Helsinki, Finland) <eija.tuominen(a)helsinki.fi> Prof. HAEGGSTRÖM, Edward (Department of Physics, University of Helsinki, PO Box 64, 00014, Helsinki, Finland) <haeggstr(a)mappi.helsinki.fi> Dr. KALLIOPUSKA, Juha (Advacam Ltd, Tietotie 3, Espoo, Finland) <juha.kalliopuska(a)advacam.com> Dr. VÄHÄNEN, Sami (Advacam Ltd, Tietotie 3, Espoo, Finland) <sami.vahanen(a)advacam.com> Dr. KASSAMAKOV, Ivan (Department of Physics, University of Helsinki, PO Box 64, 00014, Helsinki, Finland) <ivan.kassamakov(a)helsinki.fi> Abstract presenters: Ms. KARADZHINOVA, Aneliya Track classification: Sensors: 1b) Semiconductor Detectors Presentation type: Oral Comments:

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[Tipp2014] [Indico] New abstract submission: LAURIEN, Sebastian
by noreply-indico-team＠cern.ch 28 Feb '14

28 Feb '14

The following email has been sent to LAURIEN, Sebastian: === Dear Sebastian Laurien, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts>. Status of your abstract: <https://indico.cern.ch/event/192695/call- for-abstracts/336/>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: LAURIEN, Sebastian Submitted on: 28 February 2014 12:23 Title: Prototype tests for a highly granular scintillator-based hadron calorimeter Abstract content Within the CALICE collaboration, several concepts for the hadronic calorimeter of a future linear collider detector are studied. After having demonstrated the capabilities of the measurement methods in "physics prototypes", the focus now lies on improving their implementation in "engineering prototypes", that are scalable to the full linear collider detector. The Analog Hadron Calorimeter (AHCAL) concept is a sampling calorimeter of tungsten or steel absorber plates and plastic scintillator tiles read out by silicon photomultipliers (SiPMs) as active material. The front-end chips are integrated into the active layers of the calorimeter and are allowing the prototype to be equipped with different types of scintillator tiles as well as SiPMs. Four of the currently available eight layers have been equipped with a novel design of scintillator tile wrapped in reflecting foil and directly coupled to a KETEK SiPM. The blue sensitive SiPM has 2304 pixels, an average gain of 600k electrons and an average dark count rate of 200kcps when operated at 2.5V above breakdown and 22°C. Furthermore the temperature dependence of the breakdown voltage for these SiPMs is only 17 mV/°C, which ensures a stable operation. The operation at fixed overvoltage ensures a homogeneous response and behaviour of the calorimeter. Results from recent beam test measurements of minimal ionizing particles will be compared to calibrations obtained in the lab and the analysis on electromagnetic showers will be presented. Plans for future hadron beam tests with a larger prototype will be discussed. Summary Primary Authors: LAURIEN, Sebastian (University of Hamburg) <sebastian.laurien(a)desy.de> RAMILLI, Marco (D) <marco.ramilli(a)desy.de> GARUTTI, Erika (DESY) <erika.garutti(a)desy.de> Co-authors: Abstract presenters: LAURIEN, Sebastian Track classification: Sensors: 1a) Calorimetry Presentation type: Oral Comments: I would like to Add something like: "for the CALICE collaboration" instead of an author. I was not able to find an Option and trying to define an Additional "author" would probably result in quite a lot of chaos... Could you let me know how to add a Collaboration? (or saving me the trouble of adding a few hundred people? ;) )

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[Tipp2014] [Indico] New abstract submission: Mr. SOLTVEIT, Hans Kristian
by noreply-indico-team＠cern.ch 28 Feb '14

28 Feb '14

The following email has been sent to Mr. SOLTVEIT, Hans Kristian: === Dear Hans Kristian Soltveit, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts>. Status of your abstract: <https://indico.cern.ch/event/192695/call- for-abstracts/335/>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: Mr. SOLTVEIT, Hans Kristian Submitted on: 28 February 2014 12:12 Title: Multi-Gigabit Wireless Data Transfer for Tracker Readout Systems Abstract content State-of-the-art tracking detector systems as the ATLAS silicon micro-strip tracker will after the upgrade in 2022, require an overall readout bandwidth between 50 and 100 Tb/s. To allow such a highly granular tracker to contribute to the first level trigger decision or event filtering, a fast readout system with a tremendous bandwidth is therefore essential. With up to 9 GHz of continous license free bandwidth allocated worldwide centerd around 60 GHz, a fast readout system using a wireless data transfer at that carrier frequency becomes feasible. A prototype transceiver at 60 GHz with 9 GHz bandwidth is currently under development at University of Heidelberg using the IBM 0.13μm SiGe HBT BiCMOS process. The design is based on the well known superheterodyne transceiver architecture. The targeted data rate for our first prototype is 4.5 gigabit per second over a distance of 20 cm. The Multi-Gigabit transceiver system, its individual blocks and key issues of the system design will be explained in detail in this talk. Summary Primary Authors: Mr. SOLTVEIT, Hans Kristian (Ruprecht-Karls-Universitaet Heidelberg (DE)) <soltveit(a)physi.uni-heidelberg.de> Co-authors: WIEDNER, Dirk (Ruprecht-Karls-Universitaet Heidelberg (DE)) <dirk.wiedner(a)cern.ch> SCHOENING, Andre (Ruprecht-Karls-Universitaet Heidelberg (DE)) <schoning(a)mail.desy.de> Abstract presenters: Mr. SOLTVEIT, Hans Kristian Track classification: Experiments: 2a) Experiments & Upgrades Data-processing: 3a) Front-end Electronics Data-processing: 3b) Trigger and Data Acquisition Systems Presentation type: Oral Comments:

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[Tipp2014] [Indico] New abstract submission: UENO, Kazuki
by noreply-indico-team＠cern.ch 28 Feb '14

28 Feb '14

The following email has been sent to UENO, Kazuki: === Dear Kazuki Ueno, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts>. Status of your abstract: <https://indico.cern.ch/event/192695/call- for-abstracts/334/>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: UENO, Kazuki Submitted on: 28 February 2014 11:45 Title: ROESTI: A Front-end Electronics for Straw Tube Tracker in COMET Experiment Abstract content The COMET experiment at J-PARC aims to search for the charged lepton flavor violating process of neutrinoless $\mu$-e conversion with an improvement of a sensitivity by a factor of 10000 to the current limit. When the $\mu$-e conversion occurs, almost all the energy of the muon mass is carried out by the electron which is expected to have the monochromatic energy of about 105 MeV. In order to achieve the goal sensitivity, the measurement of the electron with momentum resolution of better than 200 keV/$c$ is needed. We plan to use a straw tube tracker as an electron detector, which can reduce multiple scattering effect strongly. To read out the signal from the tracker precisely, an optimal front-end electronics is also needed, and we have developed the readout electronics board called ROESTI. The ROESTI requires gain of about 1 V/pC due to the minimum charge from the tracker, timing resolution of ns order due to the position resolution and the drift velocity of the tracker, and pileup capability due to the hit rate of 100 kHz for 5$\times$10$^{9}$ $\mu$/s. We should also consider the number of readout channels, power consumption, and space limitation. Based on these requirements, we have designed ROESTI which contains all the front-end processes; preamplification, pulse-shaping, discrimination, and digitization, and all function is controlled through a local bus by a FPGA-based readout controller. We have developed the ROESTI prototype and evaluated the performance. In this presentation, we report the current status of the ROESTI prototype. Summary Primary Authors: Dr. UENO, Kazuki (KEK) <kazuueno(a)post.kek.jp> Co-authors: Mr. HAYASHI, Tatsuya (Osaka University) <t-hayashi(a)kuno-g.phys.sci.osaka-u.ac.jp> Dr. IKENO, Masahiro (KEK) <ikeno(a)post.kek.jp> Prof. MIHARA, Satoshi (KEK) <satoshi.mihara(a)kek.jp> Dr. NISHIGUCHI, Hajime (KEK) <hajime.nishiguchi(a)kek.jp> Mr. OKAMOTO, Keita (Osaka University) <k-okamoto(a)kuno-g.phys.sci.osaka-u.ac.jp> Prof. TANAKA, Manobu (KEK) <tanakam(a)post.kek.jp> Dr. UCHIDA, Tomohisa (KEK) <uchida(a)post.kek.jp> Abstract presenters: Dr. UENO, Kazuki Track classification: Data-processing: 3a) Front-end Electronics Presentation type: Oral Comments:

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[Tipp2014] [Indico] New abstract submission: MESSINA, Andrea
by noreply-indico-team＠cern.ch 28 Feb '14

28 Feb '14

The following email has been sent to MESSINA, Andrea: === Dear Andrea Messina, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts>. Status of your abstract: <https://indico.cern.ch/event/192695/call- for-abstracts/333/>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: MESSINA, Andrea Submitted on: 28 February 2014 11:27 Title: The GAP Project - GPU for Realtime Applications in High Level Trigger and Medical Imaging Abstract content The aim of the GAP project is the deployment of Graphic Processing Units (GPUs) in real-time applications, ranging from online event selection (trigger) in high energy physics (HEP) experiments to medical imaging reconstruction. The final goal of the project is to demonstrate that GPUs have a positive impact in sectors different for rate, bandwidth, and computational intensity. The relevant aspects under study are the analysis of the latency of the system, the optimisation of the computational algorithms, and the integration with the data acquisition system. As a benchmark application we consider the trigger algorithms of two HEP experiments: NA62 and Atlas, different for event complexity and processing latency requirements. In particular we discuss how specific algorithms can be parallelized and thus benefit from the implementation on the GPU architecture, in terms of increased execution speed and more favourable dependency on the complexity of the analyzed events. Such improvements are particularly relevant for the foreseen LHC luminosity upgrade where highly selective algorithms will be crucial to maintain a sustainable trigger rate with the many multiple pp interactions per bunch crossing. We give details on how these devices are integrated in typical trigger systems and benchmark their performances. GPUs can provide a feasible solution also to accelerate the reconstruction of medical images. We discuss the implementation of new computational intense algorithms boosting the performances of Nuclear Magnetic Resonance and Computed Tomography. The deployment of GPUs can significantly reduce the processing time, making it suitable for the use in realtime diagnostic. Summary In this contribution we report on the activity of the GAP project, which aims to investigate the deployment of Graphic Processing Units (GPU) in different context of realtime scientific applications. The different areas of interest span across various rates of data processing, bandwidth and computational intensity of the executed algorithms. In this contribution we focus in particular on the applications of GPUs in asynchronous systems such as software trigger systems of particle physics experiment, and reconstruction of nuclear magnetic resonance images. All these application can benefit from the implementation on the massively parallel architecture of GPUs, optimizing different aspects. As a first application we discuss how specific trigger algorithms can be naturally parallelized and thus benefit from the implementation on the GPU architecture, in terms of execution speed and complexity of the analyzed events. Two benchmark application environment under investigation are the NA62 and Atlas experiments at CERN. The NA62 experiment aims at the measurement of ultra-rare kaon decays, recording data from the SPS high intensity hadron beam. A selective trigger, based on sequential hardware and software layers, is very important in order to identify in realtime interesting events produced at the level of 1/10-10. The GPUs can be exploited to build offline reconstruction quality trigger primitives, that allow the definition of highly pure and efficient selection criteria. Even if the NA62 collaboration is considering the application of GPUs both in the hardware and software trigger, in this contribution we focus on their implementation on this latter, devoted to reduce the data collection rate from 1 MHz to ~10 kHz. We discuss the benefits achievable from the implementation on GPU of the ring reconstruction algorithms in the NA62 RICH detector and tracking spectrometer. In both cases innovative algorithms have been designed to specifically benefit from the massive parallelism of the GPU architecture. The Atlas experiment register data from the LHC pp collisions through an hybrid multi-stage trigger. A first synchronous level is based on custom electronics, while the subsequent is asynchronous and based on software algorithm ran on commodity PC farm. The benchmark activity we are carrying out involves the software trigger algorithms used for muon reconstruction in the detector. This is based on the execution for a large number of times of the same algorithms that reconstruct and match segments of particle trajectories in the detector, hence can benefit from a massively parallel execution on GPUs. We will discuss in details the implementation of such algorithms on a GPU based system. We will characterize the performance of this new implementation, and benchmark it against the present ATLAS muon algorithm performances. The integration of the GPU within the current data acquisition system is done through a server-client structure [1] that can manage different tasks and their execution on a given device, such as the GPU. This element is flexible, able to deal with different computation devices, and is adding almost no overhead on the total latency of the algorithm execution. With the help of this structure it is possible to isolate the muon trigger algorithm itself, and optimize it for the execution on GPU. This will imply the translation to the CUDA programming language and the optimization of the different task that can be naturally parallelized. In such a way the dependency of the execution time on the complexity of the processed events will be reduced. A similar approach has been investigated in the past for the deployment of GPUs in different Atlas trigger algorithms with promising results [2]. The evolution of the foreseen Atlas trigger system, that will merge the higher level trigger layers in a unique software processing stage, can take event more advantage from the use of GPUs. More complex algorithm, with offline- like resolution can be implemented on a thousand-core device with significant speedup factors. The timing comparison between the serial and the parallel implementation of the trigger algorithm is done on the data collected in the past year, and also on simulated data that reproduces the foreseen data taking conditions with the LHC luminosity upgrade, with increased number of multiple interactions in the collisions. A similar improvement can be obtained exploiting GPU in medical imaging. This diagnostic techniques, as the Nuclear Magnetic Resonance (NMR) allows to visualize images of the body part through information on diffusion of water molecules. The most advanced elaboration techniques are based on calculation of ~1M non-linear functions, naturally parallelizable and computationally demanding algorithms. In this project we are focusing on the kurtosis diffusion method K [3], that currently takes ~20 hours to precisely reconstruct a brain image. These algorithms, currently implemented in Matlab, can be converted to a parallel version for GPU thanks to available compatibility libraries. Performance measurements will be presented on the parallel implementation of the image reconstruction algorithms and of the Monte Carlo simulation techniques. [1] The client-server structure is obtained using APE, an Atlas tool developed independently from this project. [2] D. Emeliyanov, J. Howard, J. Phys.: Conf. Ser. 396 012018, 2012. [3] J.H. Jensen, J.A. Helpern, NMR Biomed; 23 (7): 698-710, 2010. Primary Authors: MESSINA, Andrea (CERN) <andrea.messina(a)cern.ch> BAUCE, Matteo (Universita e INFN, Roma I (IT)) <matteo.bauce(a)cern.ch> GIAGU, Stefano (Universita e INFN, Roma I (IT)) <stefano.giagu(a)cern.ch> RESCIGNO, Marco (Universita e INFN, Roma I (IT)) <marco.rescigno(a)cern.ch> LAMANNA, Gianluca (Sezione di Pisa (IT)) <gianluca.lamanna(a)cern.ch> FIORINI, Massimiliano (Universita di Ferrara (IT)) <massimiliano.fiorini(a)cern.ch> PINZINO, Jacopo (Sezione di Pisa (IT)) <jacopo.pinzino(a)cern.ch> CORVO, Marco (Universita e INFN (IT)) <marco.corvo(a)cern.ch> CAPUANI, Silvia (CNR) <silvia.capuani(a)roma1.infn.it> PALOMBO, Marco (sapienza universita di roma) <marco.palomboi(a)roma1.infn.it> Dr. DI DOMENICO, Giovanni (Universita' di Ferrara) <didomenico(a)fe.infn.it> Co-authors: Abstract presenters: MESSINA, Andrea Track classification: Data-processing: 3b) Trigger and Data Acquisition Systems Technology transfer: 5b) Health and healthcare Presentation type: Oral Comments:

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tipp2014 February 2014