tipp2014 January 2014

tipp2014@nikhef.nl

17 participants
185 discussions

[Tipp2014] [Indico] New abstract submission: TEH, Lloyd
by noreply-indico-team＠cern.ch 29 Jan '14

29 Jan '14

The following email has been sent to TEH, Lloyd: === Dear Lloyd Teh, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/userAbstracts.py?confId=192695>. Status of your abstract: <https://indico.cern.ch/abstractDisplay.py?abstractId=60&confId=192695>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: TEH, Lloyd Submitted on: 29 January 2014 00:28 Title: Fine Segmented Scintillator ECAL Abstract content The idea of using scintillator strips coupled with Pixelated Photon-Detector(PPD) has provided the ILD an electromagnetic calorimeter(ECAL) option with a lower cost. In the FNAL 2009 beam test, it was found that the prototype calorimeter of 30 layers could meet the stringent requirements of the ILD. Following this, efforts has been made to develop a more feasible ECAL in terms of performance, size and cost. With a more compact readout electronics and improved PPD, 2 layers of embedded front end electronics technological prototype was fabricated using 3 layers of 180x180mm^2 ECAL base unit(EBU), in which each EBU has 144 channels of 45x5mm scintillator strip coupled with the improved PPD. The two layers are arranged orthogonally and by using the Strip Splitting Algorithm(SSA), we could create a fine granularity of 5x5mm^2 for the Particle Flow Algorithm application. The layers were tested at DESY and the results of this beam test shall be presented. In addition, various studies has been made on the scintillator strip in order to further improve the ScECAL’s performance such as to reduce the dead volume by PPD etc. The findings of these studies shall also be discussed and compared with the simulation results. Summary The ScECAL technological prototype shows no significant problems operating in a multilayer configuration and the SSA works well. The results from the beam test shows good energy deposit, low noisy or dead channel ratio and good scintillator uniformity. By modifying the scintillator strip shape and configuration, these performance can be further improved. Primary Authors: HAMASAKI, Ryutaro (Shinshu University) <hamasaki(a)azusa.shinshu-u.ac.jp> IEKI, Sei (University of Tokyo) <ieki(a)icepp.s.u-tokyo.ac.jp> KOTERA, Katsushige (Shinshu University) <coterra(a)azusa.shinshu-u.ac.jp> OGAWA, Tomohisa (Shinshu University) <ogawa(a)azusa.shinshu-u.ac.jp> Dr. OOTANI, Wataru (ICEPP, University of Tokyo) <wataru(a)icepp.s.u-tokyo.ac.jp> Prof. TAKESHITA, Toru (Shinshu University (JP)) <tohru(a)azusa.shinshu-u.ac.jp> TEH, Lloyd (Shinshu University) <lloyd(a)azusa.shinshu-u.ac.jp> TSUZUKI, Takuya (Shinshu University) <tsuzuki(a)azusa.shinshu-u.ac.jp> Co-authors: Abstract presenters: TEH, Lloyd Track classification: Sensors: 1a) Calorimetry Presentation type: --not specified-- Comments:

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

28 Jan '14

The following email has been sent to WISHER, Ian: === Dear Ian Wisher, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/userAbstracts.py?confId=192695>. Status of your abstract: <https://indico.cern.ch/abstractDisplay.py?abstractId=59&confId=192695>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: WISHER, Ian Submitted on: 28 January 2014 23:51 Title: Design and Performance of the HAWC DAQ Abstract content The High Altitude Water Cherenkov (HAWC) Observatory, located on the Sierra Negra plateau (4100m a.s.l.) in central Mexico, is currently under construction and scheduled for completion at the end of summer 2014. The detector is comprised of tightly-packed optically-isolated water tanks, each 5m tall and 7.3m in diameter, which are instrumented with 4 Hamamatsu photomultiplier tubes. This allows the PMTs detect the secondary charged particles that are produced when high energy (100 GeV - 100 TeV for HAWC) gamma rays and cosmic rays interact with the atmosphere. Though the detector is under construction, the DAQ has been operating and expanding with the detector as tanks are added. The DAQ is designed to handle a final event trigger rate of >15 kHz with high uptime (>99%) and low latency (<5 s), while also analyzing events with multiple triggers and reconstruction algorithms in real time. This is achieved using a modular system based on inexpensive hardware components and open source technology for transferring data (ZeroMQ). This flexible framework is agnostic to the type of data that is transferred and it could easily be applied to other experiments. We will explain the motivation for this design, describe the DAQ in detail, and present the performance of the detector. Summary Primary Authors: Mr. WISHER, Ian (University of Wisconsin - Madison) <iwisher(a)icecube.wisc.edu> Co-authors: COLLABORATION, Hawc (The HAWC Observatory) <miguel(a)psu.edu> Abstract presenters: Mr. WISHER, Ian Track classification: Experiments: 2b) Astrophysics and Space Instrumentation Data-processing: 3b) Trigger and Data Acquisition Systems Presentation type: --not specified-- Comments:

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

28 Jan '14

The following email has been sent to QIAN, Sen: === Dear Sen Qian, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/userAbstracts.py?confId=192695>. Status of your abstract: <https://indico.cern.ch/abstractDisplay.py?abstractId=58&confId=192695>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: QIAN, Sen Submitted on: 28 January 2014 22:52 Title: The Status of the MCP-PMT R&D in China Abstract content The JUNO (Jiangmen Underground Neutrino Observatory) designed to build an underground lab on the location of JiangMen in south China as a generic underground national lab for many applications. The new promising neutrino programs request the higher performance of the detectors. It is proposed to increase the photoelectron detection efficiency of the PMT used in neutrino experiment. The researchers in IHEP designed a new type of MCP-PMT. The small MCP unit instead of the large Dynode, the transmission photocathode and the reflection photocathode were assembled in the same glass shell to form nearly 4 pai photocathode effective area to enhance the efficiency of the photoelectron detecting. Some researchers and engineers in institutes and companies in China come together to manufacture and research this type of PMT based on the MCPs. After two years R&D work, several 8 inch prototypes were produced and there performance was carefully tested in our Lab. The MCP-PMT performance test system was built in our Lab for better performance test. The characteristics of the photocathode were carefully researched by testing the I-V curve, the QE, and the QE-map for the 8 inch area photocathode uniformity. Also we measured the charge spectrum to confirm its ability for the single photoelectron spectrum. More simulation and experiment work have already done to develop an 8 inch prototype module for the MCP-PMT designed in IHEP, and the detailed will be described in this formal manuscript. Summary Primary Authors: QIAN, Sen (I) <qians(a)ihep.ac.cn> Co-authors: Abstract presenters: QIAN, Sen Track classification: Sensors: 1d) Photon Detectors Presentation type: --not specified-- Comments:

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

28 Jan '14

The following email has been sent to DANNHEIM, Dominik: === Dear Dominik Dannheim, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/userAbstracts.py?confId=192695>. Status of your abstract: <https://indico.cern.ch/abstractDisplay.py?abstractId=57&confId=192695>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: DANNHEIM, Dominik Submitted on: 28 January 2014 22:00 Title: Vertex-Detector R&D for CLIC Abstract content The CLIC vertex detector must have excellent spatial resolution, full geometrical coverage extending to low polar angles, extremely low mass, low occupancy facilitated by time-tagging, and sufficient heat removal from sensors and readout. These considerations, together with the physics needs and beam structure of CLIC, push the technological requirements to the limits and imply a very different vertex detector than the ones currently in use elsewhere. A detector concept based on hybrid planar pixel-detector technology is under development for the CLIC vertex detector. It comprises fast, low-power and small-pitch readout ASICs implemented in 65 nm CMOS technology (CLICpix) coupled to ultra-thin sensors via low-mass interconnects. The power dissipation of the readout chips is reduced by means of power pulsing, allowing for a cooling system based on forced gas flow. In this talk, the CLIC vertex-detector requirements are reviewed and the current status of R&D on sensors, readout and detector integration is presented. Summary Primary Authors: DANNHEIM, Dominik (CERN) <dominik.dannheim(a)cern.ch> Co-authors: Abstract presenters: DANNHEIM, Dominik Track classification: Sensors: 1b) Semiconductor Detectors Presentation type: --not specified-- Comments: Talk will be given on behalf of the CLIC detector and physics study (CLICdp).

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

28 Jan '14

The following email has been sent to : === Dear , The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/userAbstracts.py?confId=192695>. Status of your abstract: <https://indico.cern.ch/abstractDisplay.py?abstractId=56&confId=192695>. 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 January 2014 21:45 Title: COORDINATE-SENSITIVE MICROELECTRONIC DETECTOR Abstract content The term "Coordinate-sensitive microelectronic detector" means a device for one dimentional simultaneous detection of separated in the space electron flow, falling on the working surface of the detector. Laser mass spectrometry is one of the most beneficial applications of this detector, but these detectors can be successfully used in other areas where one-dimensional spatial detection of charged and neutral particles is required. In general dimensions and resolving capacity of the detector are determined by collector’s number which collects the electrons charge, its dimension and pitch. Each collector has its own charge to digit converter completed bodily on one semiconductor chip. Charge to digit conversion mechanism is defined by direct calculating charge’s portions (number of electrons) drops to collector. To ensure that sensitivity allows registering of individual ions, the detector has an integrated assembly of two microchannel plates arranged in front of the surface of the receiving electrodes. Structurally, the detector is designed as a ceramic-based monoblock, which is mounted on the chip detector assembly of microchannel plates and the necessary interface connectors. Overall dimensions of the detector assembly is 40x25x5mm. Size of the sensitive area is 2x10mm. Summary Primary Authors: Dr. NAGORNYY, Dmitry (Institute of Applied Physics, NAS of Ukraine) <dimon(a)obloha.cz> Co-authors: Dr. EREMENKO, Viktor (Institute of Applied Physics, NAS of Ukraine) <dimongs(a)obloha.cz> Abstract presenters: Dr. NAGORNYY, Dmitry Track classification: Sensors: 1b) Semiconductor Detectors Presentation type: --not specified-- Comments:

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

28 Jan '14

The following email has been sent to BALAGURA, Vladislav: === Dear Vladislav Balagura, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/userAbstracts.py?confId=192695>. Status of your abstract: <https://indico.cern.ch/abstractDisplay.py?abstractId=55&confId=192695>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: BALAGURA, Vladislav Submitted on: 28 January 2014 20:30 Title: Development of technological prototype of silicon-tungsten electromagnetic calorimeter for ILD. Abstract content The best jet energy resolution required for precise physics measurements at ILC is achievable using a Particle Flow Algorithm (PFA) and highly granular calorimeters. As it was shown by CALICE international R&D collaboration, the silicon-tungsten imaging electromagnetic calorimeter provides the best granularity and jet resolution. After proving the PFA concept with physical prototypes in 2006-2011, an emphasis is now moved to building a technological prototype satisfying challenging physical, mechanical, electronic and thermal requirements. All chosen technologies should be reliable and scalable for a mass production of a future detector. We report on the current status of R&D, in particular, on beam, cosmic and charge injection tests of the technological prototype and on the tests of ECAL mechanical structure with embedded fiber Bragg grating optical sensors. We also report on our plans to build a realistic almost full-scale prototype detector of 1-1.5 m length and test it together with an existing 600 kg carbon fiber - tungsten mechanical structure in 2015 at CERN beams. Summary Primary Authors: CORNAT, Remi Jean Noel (Ecole Polytechnique (FR)) <remi.cornat(a)in2p3.fr> Dr. ANDUZE, Marc (LLR) <anduze(a)llr.in2p3.fr> BALAGURA, Vladislav (Ecole Polytechnique (FR)) <vladislav.balagura(a)cern.ch> Co-authors: ON BEHALF OF ALL ILD SIW ECAL GROUP, . (.) <balagura(a)llr.in2p3.fr> Abstract presenters: BALAGURA, Vladislav Track classification: Sensors: 1a) Calorimetry Sensors: 1b) Semiconductor Detectors Data-processing: 3a) Front-end Electronics Data-processing: 3b) Trigger and Data Acquisition Systems Presentation type: --not specified-- Comments:

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[Tipp2014] [Indico] New abstract submission: FUENTES ROJAS, Cristian Alejandro
by noreply-indico-team＠cern.ch 28 Jan '14

28 Jan '14

The following email has been sent to FUENTES ROJAS, Cristian Alejandro: === Dear Cristian Alejandro Fuentes Rojas, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/userAbstracts.py?confId=192695>. Status of your abstract: <https://indico.cern.ch/abstractDisplay.py?abstractId=54&confId=192695>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: FUENTES ROJAS, Cristian Alejandro Submitted on: 28 January 2014 17:07 Title: A power-pulsing scheme for the CLIC vertex detector and its 3D integration Abstract content The vertex detector is the innermost detector at the proposed CLIC linear electron-positron collider. It is composed of several layers of pixel sensors and readout ASICs, and the barrel region is made of “ladders”. The precision physics requirements limit the material budget for sensors, readout, support, cooling and cabling to less than 0.2% of a radiation length (X0) per detection layer. However, the power consumption of the readout electronics strongly impacts the required low material budget of the detector. To reduce the cable and cooling material, the average power per unit area has to be small (<50 mW/cm^2). The collision at CLIC will occur in bunch crossings every 0.5 ns during a bunch train of 156 ns. The time between consecutive trains is approximately 20 ms. Turning on the readout ASICs during the bunch trains and keeping them idle in the other part of the cycle will therefore significantly reduce the average power dissipation. The use of this beam duty cycle to reduce the average power is known as power-pulsing. The use of a power-pulsing scheme implies that the ASIC current consumption has to change suddenly from its idle value (few hundreds of mA) to full load (more than 40 Amps for a single ladder composed of 24 ASICs) within a few microseconds, then remain constant for enough time to record and process the events (few tens of microseconds) and finally drop back to the idle current value. During the bunch train, the power consumption is at its maximum and constant, and the supplied voltage for the analog components has to remain within 5% of the nominal voltage in order to allow for a correct functioning of the readout ASICs. The latter is particularly challenging, considering the big transient that takes place before the readout process. The analog and digital components of the ASICs have different constraints and therefore will be powered separately. A power-pulsing scheme based on a controlled current source allows achieving a material contribution of 0.1% of X0, which is expected to be reduced as the silicon capacitors technology improves. It consists of a controlled back-end current source that charges silicon capacitors in the ladder with low current during the idle time. In this way, the charging current is reduced to less than 100 mA for a whole ladder. The charge accumulated in these capacitors is then delivered to the ASICs during the bunch crossing time and the voltage is regulated using Low Dropout Regulators (LDOs). A prototype of this back-end current source was implemented using an FPGA. A dummy load emulating the power consumption of the analog and digital components has been implemented. In order to consolidate the proposed scheme the integration of such a system was studied. This implementation requires the use of through silicon vias, silicon capacitor die structures, and 3D connections to an LDO and a low mass interconnection cable. This talk will present the proposed powering scheme and the possible solutions of the 3D integration problem. Summary Primary Authors: BLANCHOT, Georges (CERN) <georges.blanchot(a)cern.ch> FUENTES ROJAS, Cristian Alejandro (CERN) <cristian.alejandro.fuentes.rojas(a)cern.ch> Co-authors: Abstract presenters: FUENTES ROJAS, Cristian Alejandro Track classification: Experiments: 2a) Experiments & Upgrades Presentation type: --not specified-- Comments:

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[Tipp2014] [Indico] New abstract submission: MARINAS PARDO, Carlos
by noreply-indico-team＠cern.ch 28 Jan '14

28 Jan '14

The following email has been sent to MARINAS PARDO, Carlos: === Dear Carlos Marinas Pardo, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/userAbstracts.py?confId=192695>. Status of your abstract: <https://indico.cern.ch/abstractDisplay.py?abstractId=53&confId=192695>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: MARINAS PARDO, Carlos Submitted on: 28 January 2014 15:18 Title: Ultra-transparent DEPFET pixel detectors for future electron- positron experiments Abstract content The DEPFET Collaboration develops highly granular, ultra-thin pixel detectors for outstanding vertex reconstruction at future collider experiments. A DEPFET sensor, by the integration of a field effect transistor on a fully depleted silicon bulk, provides simultaneously position sensitive detector capabilities and in-pixel amplification. The characterization of the latest DEPFET prototypes has proven that a comfortable signal to noise ratio and excellent single point resolution can be achieved for a sensor thickness of 50 micrometers. The close to final auxiliary ASICs have been produced and found to operate a DEPFET pixel detector of the latest generation with the required read-out speed. A complete detector concept is being developed for the Belle II experiment at the new Japanese super flavor factory. DEPFET is not only the technology of choice for the Belle~II vertex detector, but also a solid candidate for the ILC. Therefore, in this paper, the status of DEPFET R&D project is reviewed in the light of the requirements of the vertex detector at a future electron-positron collider. Summary Primary Authors: Dr. MARINAS, Carlos (University of Bonn) <cmarinas(a)uni-bonn.de> Co-authors: Abstract presenters: Dr. MARINAS, Carlos Track classification: Experiments: 2a) Experiments & Upgrades Presentation type: --not specified-- Comments:

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[Tipp2014] [Indico] New abstract submission: DELLA PIETRA, Massimo
by noreply-indico-team＠cern.ch 28 Jan '14

28 Jan '14

The following email has been sent to DELLA PIETRA, Massimo: === Dear Massimo Della Pietra, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/userAbstracts.py?confId=192695>. Status of your abstract: <https://indico.cern.ch/abstractDisplay.py?abstractId=52&confId=192695>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: DELLA PIETRA, Massimo Submitted on: 28 January 2014 13:42 Title: Deformation Monitoring of a Tracking Particle Detector using Fiber Bragg Grating sensors. Abstract content The frontier evolution of a gaseous tracking particle detector technology has been moved in developing Micro-Pattern Gas Detectors that can achieve unprecedented spatial resolution, high rate capability and large sensitive area. However, also the geometry of such kind of tracking detector, in spite of the particular technology used, has to be known with a precision of the order of few tens of μm. The relative position of each detector with respect to a reference system is usually measured through optical sensor elements (CCDs, lenses, light sources), but also any deformation (bending, strain, torsion) with respect to its ideal shape has to be monitored as well. From this consideration, a real-time sensing technology capable to detect any curvature and deformation of a detector with a resolution of few tens of μm is desirable. However any sensor to be integrated with the detector itself should ideally comply with many requirements in terms of radiation hardness, insensitivity to magnetic field, and so on. Fiber Bragg gratings (FBGs) seem to provide a suited solution. In fact, the fiber itself can tolerate very high levels of radiations, is insensitive to magnetic field and electromagnetic noise, and FBGs are intrinsic strain and temperature sensors with wavelength-encoded information, offer high multiplexing capability with reduction of cabling complexity and linear output. In this work FBG technology is proposed as suitable sensing solution for the real-time deformation monitoring of a tracking particle detector. As a demonstrative target, some FBG sensors have been integrated with a miniature detector support panel in order to investigate their potentialities/capabilities in detecting local strain and thus bending. Preliminary experimental results are presented and discussed. Summary Our case of study is to use an FBG sensors with a micromegas (an abbreviation for “micro mesh gaseous structure” (MM)), that is a micro patter gas detector. One mandatory issue for the correct operation of the MM detector is a precise monitoring of its panels’ flatness/deformation. The basic idea, proposed here for the first time, relies with the development of a deformation monitoring system based on FBG technology, where several FBG strain sensors are surface attached to both detector support panels. Measuring strain on both sides of the panel it is possible to obtain its local curvature that is related to the second derivatives of the shape described by the bent surface. Actually, if a planar surface is bent, a positive strain (tensile) is induced on a side and a negative strain (compressive) is induced on the other one: curvature is proportional to the their relative difference. On the contrary, if a same sign strain is measured on the two sides of the surface, a longitudinal deformation of the surface can be derived. Following this idea, the whole surface of the support panels can be subdivide into a proper number of elements that undergo simple deformation. Each element will be monitored by using FBGs attached to the surface of the panel. A mechanical Finite Element Method analysis of a full size support panel is necessary in order to determine the number and the dimension of these elements, taking into account the mechanical properties of the panel and performance requirements. The sensing principle of a fiber Bragg grating can be expressed as 〖∆λ〗_B/λ_B =S_ε ε+S_T ∆T where λB is the original Bragg wavelength under strain free and initial temperature condition, ΔλB is the variation in Bragg wavelength due to applied strain ɛ and temperature variation ΔT, and Sɛ and ST are the sensitivity coefficients to strain and temperature, respectively. It is worth noting that in order to measure the strain of an host material, temperature compensation of the FBG sensor is required. The resolution of these technology is of the order of 1 με , suitable for the physical requirements on the detector geometry. The obtained results prove that the proposed approach has the potentialities to permit a continue monitoring of the deformation and bending of the detector. Primary Authors: Dr. DELLA PIETRA, Massimo (Engineering Dept, University of Naples “Parthenope” and INFN) <massimo.della.pietra(a)cern.ch> Co-authors: Prof. CAMPOPIANO, Stefania (Engineering Dept, University of Naples “Parthenope”) <stefania.campopiano(a)uniparthenope.it> Prof. IADICICCO, Agostino (Engineering Dept, University of Naples “Parthenope”) <agostino.iadicicco(a)uniparthenope.it> Abstract presenters: Dr. DELLA PIETRA, Massimo Track classification: Sensors: 1c) Gaseous Detectors Emerging technologies: 4e) Precision engineering Presentation type: --not specified-- Comments: Our first choice on the track classification is "Emerging technologies: 4e) Precision engineering", the second one is Sensors: 1c) Gaseous Detectors

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

28 Jan '14

The following email has been sent to SCHWEGLER, Philipp: === Dear Philipp Schwegler, The submission of your abstract has been successfully processed. Abstract submitted: <https://indico.cern.ch/userAbstracts.py?confId=192695>. Status of your abstract: <https://indico.cern.ch/abstractDisplay.py?abstractId=51&confId=192695>. See below a detailed summary of your submitted abstract: Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics Submitted by: SCHWEGLER, Philipp Submitted on: 28 January 2014 12:51 Title: High-Rate Properties of Drift Tube Chambers for HL-LHC Abstract content The Monitored Drift Tube (MDT) chambers of the ATLAS experiment provide muon track reconstruction with a spatial resolution of about 35 µm and efficiency of almost 100% up to the maximum expected background rates at nominal LHC luminosity. For much higher background rates, as they are anticipated for LHC luminosity upgrades (HL-LHC), sMDT chambers with 15 mm tube diameter, which is half the diameter of the MDT chambers, have been developed. Compared to MDT chambers, they suffer much less from space charge caused by background hits and provide more redundancy due to the higher packing density of the drift tubes. In the existing MDT front-end electronics, bipolar shaping is used to eliminate the long signal tail caused by the slowly drifting ions and to guarantee baseline stability at high rates. The undershoot of the bipolar shaping causes, however, signal pile-up of fast successive pulses. The impact of signal pile-up is equivalent to a higher discriminator threshold for the subsequent pulse and implies additional time slewing and degradation of the detection efficiency. A technical solution consists in an active baseline restorer. We present measurements of (s)MDT chambers under irradiation with the existing front-end electronics and with an alternative front-end chip featuring active baseline restoration and compare the performance. We also report on the development of a new version of the MDT front-end chip as a replacement for the existing one and with the option of a baseline restorer for future electronics upgrades. Summary The ATLAS Monitored Drift Tube (MDT) chambers consist of aluminum tubes with 30 mm diameter and a central sense wire with 50 µm diameter set to a potential of +3080 V. The drift tubes are operated with Ar/CO₂ (93/7) gas mixture at 3 bar absolute pressure, resulting in a gas amplification of 2×10⁴. The maximum electron drift time for hits near the tube wall is approximately 700 ns, ions can drift for several milliseconds causing long tails in the corresponding pulse shapes. The existing ASD (Amplifier-Shaper-Discriminator) front-end chip has been optimized for typical pulses of muon and background hits at rates of up to a few hundred kHz per channel. Bipolar shaping is used for baseline restoration, compensating partly the long ion tails. The typical time needed to arrive at the baseline after a hit is approximately 500 ns which is sufficient for the referred rates and the typical lengths of the MDT pulse trains. For the high luminosity upgrade of the LHC (HL-LHC), new drift tube chambers (sMDT) with reduced tube diameter - 15 mm instead of 30 mm - have been developed. They are operated with the same gas mixture and amplification as the 30 mm MDTs, leading to an operating voltage of 2730 V. As the drift velocity in the gas decreases with increasing drift radii, the maximum drift time is reduced from about 700 to 185 ns, resulting in considerably shorter pulse trains. This allows to operate the sMDT chambers at much higher rates with high efficiency. Measurements of sMDT chambers equipped with the existing ASD chip under photon and proton irradiation at rates of up to 1.5 MHz per channel show a considerable gain in the 3σ efficiency of sMDTs compared to MDTs with 30 mm diameter at high background rates. The improvement is limited, however, by the undershoot of the bipolar shaping and the long baseline restoration time of approximately 500 ns, respectively. Simulations suggest that reducing the baseline restoration time has the potential to improve the efficiency at rates of 1.5 MHz per channel from ~61% to ~76%. With increasing rates the yield is even higher. A possible approach for faster baseline restoration has been implemented in the front-end chip of the ATLAS Transition Radiation Tracker (TRT), the ASDBLR chip, with active baseline restorer (BLR). We present measurements and simulations of such a chip with active baseline restoration on sMDT and MDT chambers and evaluate the possible improvement on the efficiency and spatial resolution. A new version of the ASD chip is in development as a replacement for the existing one, with the option of a baseline restorer for future electronics upgrades. First simulation results with the new ADC chip will be shown. Primary Authors: SCHWEGLER, Philipp (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D) <philipp.schwegler(a)cern.ch> Co-authors: KORTNER, Oliver (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D) <kortner(a)mppmu.mpg.de> KROHA, Hubert (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D) <kroha(a)mppmu.mpg.de> NOWAK, Sebastian (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D) <sebastian.nowak(a)cern.ch> OTT, Sebastian (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D) <sebastian.ott(a)cern.ch> RICHTER, Robert (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D) <robert.richter(a)cern.ch> Abstract presenters: SCHWEGLER, Philipp Track classification: Sensors: 1c) Gaseous Detectors Presentation type: --not specified-- Comments:

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tipp2014 January 2014