BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Study of some aspects of straw tube detectors for CBM-MuCh DTSTART;VALUE=DATE-TIME:20170302T053000Z DTEND;VALUE=DATE-TIME:20170302T055000Z DTSTAMP;VALUE=DATE-TIME:20261014T231454Z UID:indico-contribution-194-1589@indico.inp.nsk.su DESCRIPTION:Speakers: Saikat Biswas (Bose Institute)\nThe Compressed Baryo nic Matter (CBM) experiment at the future Facility for Antiproton and Ion Research (FAIR) in Darmstadt\, Germany is designed to explore the QCD phas e diagram in the region of moderate baryon densities. This will only be po ssible with the application of advanced instrumentation\, including highly segmented and fast gaseous detectors. Keeping in mind the high interactio n rate at FAIR\, the Muon Chamber (MuCh) detector in CBM will use Gas Elec tron Multiplier (GEM) chambers in the first two stations and straw tubes a re the candidates for the 3rd and 4th stations.\n\nWe have carried out R&D with one small straw tube detector and the efficiency and gain have been studied with premixed gas of Ar/CO2 70/30. The count rates are measured wi th different radioactive sources. The attenuation of signal and the variat ion of gain with rate are also measured. The details of the measurement pr ocess and the experimental results will be presented.\n\nhttps://indico.in p.nsk.su/event/8/contributions/1589/ LOCATION: URL:https://indico.inp.nsk.su/event/8/contributions/1589/ END:VEVENT BEGIN:VEVENT SUMMARY:Study on a new design of a GEM-based technology detector for the C MS experiment DTSTART;VALUE=DATE-TIME:20170302T022000Z DTEND;VALUE=DATE-TIME:20170302T024000Z DTSTAMP;VALUE=DATE-TIME:20261014T231454Z UID:indico-contribution-194-1608@indico.inp.nsk.su DESCRIPTION:Speakers: Martina Ressegotti (University and INFN Pavia (IT))\ nThe muon system of the Compact Muon Solenoid (CMS) experiment at the LHC is currently uninstrumented at pseudorapidity higher than |η|= 2.4. There fore\, the installation of a chamber in that position would allow track re construction beyond the calorimeter at higher pseudorapidity\, increasing the muon system's acceptance and improving the tagging of high-eta muons\, besides improving muon trigger. Main challenges to such installation are the high particle flux to be substained\, high radiation tolerance\, and f itting a multi-layered detector in a reduced available space (less than 30 cm). Micropattern Gaseous Detectors (MPGDs) show promising performances r esponding to the most severe constraints posed by High Energy Physics (HEP ) experiments. They use small amplification regions - of the order of tens of microns - allowing for a high rate capability\, a very good spatial re solution and radiation tolerance. Lots of MPGDs with different geometries have been developed and tested. An example is the Gas Electron Multiplier (GEM) detector\, using copper clad kapton foils on which microscopic holes \, hundreds microns apart\, have been chemically etched. The cathode and t he anode electrodes close the foils that are conveniently spaced to create drift\, transfer and induction gaps. A new configuration – back to back - of such a device is presented with the aim of developing a compact size multi-GEM detector. It is composed by two independent stacked triple GEM detectors\, positioned with the anodes toward the outside. In this wa y\, they can share the same cathode\, placed at the center of the system\, allowing to reduce the total detector's thickness since a single cathode and a single external frame are used. A first prototype has been produced and characterized with an X-Ray source and muon beams. First results on it s performance will be presented.\n\nhttps://indico.inp.nsk.su/event/8/cont ributions/1608/ LOCATION: URL:https://indico.inp.nsk.su/event/8/contributions/1608/ END:VEVENT BEGIN:VEVENT SUMMARY:The cylindrical GEM detector of the KLOE-2 experiment DTSTART;VALUE=DATE-TIME:20170302T055000Z DTEND;VALUE=DATE-TIME:20170302T060500Z DTSTAMP;VALUE=DATE-TIME:20261014T231454Z UID:indico-contribution-194-1638@indico.inp.nsk.su DESCRIPTION:Speakers: Di Cicco Alessandro (ROMA TRE UNIVERSITY)\nThe KLOE- 2 experiment started its data taking campaign in November 2014 with an upg raded tracking system at the DAΦNE electron-positron collider at the Fras cati National Laboratory of INFN. The new tracking device\, the Inner Trac ker\, operated together with the KLOE-2 Drift Chamber\, has been installed to improve track and vertex reconstruction capabilities of the experiment al apparatus.\n\nThe Inner Tracker is a cylindrical GEM detector composed of four cylindrical triple-GEM\ndetectors\, each provided with an X-V stri ps-pads stereo readout. Although GEM detectors\nare already used in high e nergy physics experiments\, this device is considered a frontier detector due to its fully-cylindrical geometry: KLOE-2 is the first experiment bene fiting of this novel detector technology.\n\nAlignment and calibration of this novel detector will be presented together with its operating\nperform ance and reconstruction capabilities.\n\nhttps://indico.inp.nsk.su/event/8 /contributions/1638/ LOCATION: URL:https://indico.inp.nsk.su/event/8/contributions/1638/ END:VEVENT BEGIN:VEVENT SUMMARY:Large Area Resistive Micromegas for the Upgrade of the ATLAS Muon Spectrometer DTSTART;VALUE=DATE-TIME:20170302T043000Z DTEND;VALUE=DATE-TIME:20170302T045000Z DTSTAMP;VALUE=DATE-TIME:20261014T231454Z UID:indico-contribution-194-1655@indico.inp.nsk.su DESCRIPTION:Speakers: Giovanni Maccarrone (INFN Laboratori Nazionali di Fr ascati)\nLarge size resistive Micromegas (MM) detectors will be employed f or the first time in high-energy physics experiments for the phase-1 Muon Spectrometer upgrade of the ATLAS experiment at CERN / LHC. \nThe current innermost stations of the muon endcap system\, the Small Wheel\, will be u pgraded in 2019 to retain the good precision tracking and trigger capabili ties in the high background environment expected with the upcoming luminos ity increase of the LHC.\nAlong with the small-strip Thin Gap Chambers (sT GC) the “New Small Wheel” will be equipped with eight layers of MM det ectors arranged in multilayers of two quadruplets\, for a total of about 1 200 m$^2$ detection planes. All quadruplets have trapezoidal shapes with s urface areas between 2 and 3 m$^2$. The MM system will provide both trigge r and tracking capabilities.\nA transverse momentum resolution of about 15 % for 1 TeV muon is required\, as a consequence\, each MM plane must achie ve a spatial resolution of the order of 100 $\\mu$m independent of the tra ck incidence angle. To keep systematics under control a challenging mechan ical precision is required in the construction\; the position of the reado ut elements (the strips) of the assembled module must be known with an acc uracy of 30 $\\mu$m along the precision coordinate and 80 $\\mu$m perpendi cular to the plane. The detector will operate in a very challenging enviro nment: an inhomogeneous magnetic field (B \n\nhttps://indico.inp.nsk.su/ev ent/8/contributions/1655/ LOCATION: URL:https://indico.inp.nsk.su/event/8/contributions/1655/ END:VEVENT BEGIN:VEVENT SUMMARY:Construction and Quality Assurance of Large Area Resistive Strip M icromegas for the Upgrade of the ATLAS Muon Spectrometer DTSTART;VALUE=DATE-TIME:20170302T051000Z DTEND;VALUE=DATE-TIME:20170302T053000Z DTSTAMP;VALUE=DATE-TIME:20261014T231454Z UID:indico-contribution-194-1667@indico.inp.nsk.su DESCRIPTION:Speakers: Philipp Loesel (LMU Munich)\nTo cope with the increa sed background induced hit rate of up to ~15 kHz/cm$^2$ in the innermost\ nstations of the muon endcap system of the ATLAS experiment after the high -luminosity upgrade of the\nLHC\, the currently used precision detectors w ill be replaced by resistive strip Micromegas in 2019. In\nthe "New Small Wheel" the Micromegas will be arranged in two times four detection layers built of\ntrapezoidally shaped quadruplets of four different sizes.The Mic romegas quadruplets will consist of 5\npanels\, 3 drift panels and 2 reado ut panels\, made of aluminum honeycomb core sandwiched by printed\ncircuit boards (PCBs).\n\nTo achieve 15% transverse momentum resolution for 1 TeV muons and thus a spatial resolution in a\nsingle plane of about 100 $\\ mu$m\, each active plane has to have an accuracy of 80 $\\mu$m\nperpendi cular to the plane and the alignment of the readout strips on the individu al PCBs and\nparticularly the alignment within a quadruplet must fulfill a challenging precision of 30 $\\mu$m. The\nrequired mechanical precision f or the production of the components and their assembly is a key point\nand must be controlled during construction and integration. The readout strip s are etched on PCB\nboards using classical photolithographic processes ac companied by comprehensive quality control.\nDepending on the type of the module 3 or 5 PCB boards need to be joined and precisely aligned to\nform a full readout plane. The precision in the alignment is reached either by use of precision\nmechanical holes as reference for precision pins or by o ptical alignment of masks\, both referenced to\nthe strip pattern. Assembl y procedures have been developed to build the single panels with the requi red\nmechanical precision. The assembly of a quadruplet includes exact str etching and mounting on very\naccurate frames of the four stainl ess steel micro-meshes. Methods to confirm the precision o f\ncomponents and assembly are based on precise optical de vices and X-ray or cosmic muon\ninvestigations.\n\nWe will repor t on the construction procedures for the Micromegas quadruplets\, on the q uality control\nprocedures and results\, and on the assembly and calibrati on methods\n\nhttps://indico.inp.nsk.su/event/8/contributions/1667/ LOCATION: URL:https://indico.inp.nsk.su/event/8/contributions/1667/ END:VEVENT BEGIN:VEVENT SUMMARY:High resolution micro-pattern gas detectors for particle physics\, developments at the Budker INP DTSTART;VALUE=DATE-TIME:20170302T024000Z DTEND;VALUE=DATE-TIME:20170302T030000Z DTSTAMP;VALUE=DATE-TIME:20261014T231454Z UID:indico-contribution-194-1669@indico.inp.nsk.su DESCRIPTION:Speakers: Lev Shekhtman (Budker Institute of Nuclear Physics)\ nMicro-pattern gaseous detectors (MPGDs) allow operation at very high back ground particle flux with high efficiency and spatial resolution. This com bination of parameters determines the main application of these detectors in particle physics experiments: precise tracking in the areas close to th e beam and in the end-cap regions of general purpose detectors. \nMPGDs of different configurations have been developed and are under development fo r several experiments in the Budker INP. The system of 8 two-coordinate de tectors based on cascade of Gas Electron Multipliers (GEM) is working at t he KEDR experiment at the VEPP-4M collider in the tagging system that dete cts electrons and positrons\, lost their energy in two-photon interactions and taken out of the equilibrium orbit by a dedicated magnetic system. \n Another set of cascaded GEM detectors is developed for the almost-real Pho tons Tagging System (PTS) of the DEUTRON facility at the VEPP-3 storage ri ng. The PTS contains 3 very light detectors (material content is about 0. 2% of radiation length) with very high spatial resolution (below 50 um). A t present the system is completed and the detectors are under tests at the extracted electron beam facility at the VEPP-4M collider. \nDedicated det ectors based on cascaded GEMs are developed for the extracted electron bea m facility at the VEPP-4M collider. These devices will allow precise parti cle tracking with minimal multiple scattering having very low material con tent (about 0.2% of radiation length). The readout structure of these dete ctors has 0.25 mm strip pitch in X and Y directions\, and spatial resoluti on below 50 um is expected from them according to the simulation studies. The last results from the first detector of this series will be presented at the Conference.\nAn upgrade of the coordinate system of the CMD-3 detec tor at the VEPP-2000 collider is proposed on the basis of the resistive mi cro-WELL (mu-rWELL). This structure is in fact the GEM lying at the resist ive surface that have readout structure below the resistive layer. If a hi gh voltage is applied between the top GEM electrode and the resistive laye r\, the gas amplification occurs in the GEM holes (wells) and such structu re works as a surface with distributed amplification. An advantage of such approach in comparison with cascaded GEMs system is that there is only on e active surface and\, thus\, a detector with curved (i.e. cylindrical) su rface can be easier to manufacture. We propose to make a thin cylindrical chamber based on mu-rWELL and thin end-cap disc detectors based on the sam e technology. A research activity on this subject is starting.\n\nhttps:// indico.inp.nsk.su/event/8/contributions/1669/ LOCATION: URL:https://indico.inp.nsk.su/event/8/contributions/1669/ END:VEVENT BEGIN:VEVENT SUMMARY:Discharge and stability studies for the new readout chambers of th e upgraded ALICE TPC DTSTART;VALUE=DATE-TIME:20170302T032000Z DTEND;VALUE=DATE-TIME:20170302T034000Z DTSTAMP;VALUE=DATE-TIME:20261014T231454Z UID:indico-contribution-194-1683@indico.inp.nsk.su DESCRIPTION:Speakers: Alexander Deisting (GSI Helmholtzzentrum für Schwer ionenforschung GmbH\; Physikalisches Institut\, Ruprecht-Karls-Universitä t Heidelberg)\nALICE (A Large Ion Collider Experiment)\, taking data at th e CERN Large Hadron Collider (LHC)\, uses a Time Projection Chamber (TPC) to provide tracking and particle identification of charged particles in th e central barrel. This TPC is the largest TPC built so far (almost $90\\te xtrm{m}^3$ volume) and - while operated in a 0.5T magnetic field - provide s a momentum resolution of $\\textrm{d}p/p=1\\%$ (at the multiple scatteri ng limit) as well as a $\\textrm{d}E/\\textrm{dx}$ resolution of $5$-$7\\% $. The readout chambers are Multi Wire Proportional Chambers (MWPCs)\, emp loying a gating grid to prevent ions\, which are produced during the gas a mplification\, from moving into the drift volume. Hence there is a maximal readout rate of about 3kHz - given by the closing time of the grid ($\\si m 250\\textrm{ms}$) and the electron drift time through the whole TPC ($\\ sim 90\\textrm{ms}$).\n\nAfter the long shut-down 2 (from 2021 onwards) th e LHC will provide lead-lead collisions at interaction rates of 50kHz. In order to cope with these rates the TPC needs to be upgraded with new reado ut chambers\, which allow for continuous read-out and preserve the energy and momentum resolution of the current MWPCs. Therefore the amount of ions in the drift volume can only be as big as $1\\%$ of the ions produced dur ing the gas amplification. Hence the ion back flow from the chambers has t o be small. It was found that chambers with a stack of four Gas Electron M ultipliers (GEMs) fulfil these requirements\, if the voltages applied to a ll the GEMs are tuned properly. In addition the chambers must be stable wh ile being operated at the LHC. Hence studies of the discharge behaviour wi th small prototypes (equipped with only one or two GEMs) as well as stabil ity studies with full readout chambers have been performed. During these s tudies the phenomenon of "secondary discharges" was observed. This special kind of discharge occurs after an initial discharge in a time between 0 t o several $10\\textrm{ms}$\, if the electric field above or below the GEM is high enough.\n\nIn this talk we will give an overview of the ALICE TPC upgrade and of the current design status of the GEM based readout chambers . We will focus on the studies of the chamber stability and present our cu rrent knowledge on the observed "secondary discharges" and our measures on how to avoid them. This includes our considerations of the high voltage s upply schema. In addition we'll give a short outlook on the challenges of the mass production of the new readout chambers.\n\nhttps://indico.inp.nsk .su/event/8/contributions/1683/ LOCATION: URL:https://indico.inp.nsk.su/event/8/contributions/1683/ END:VEVENT BEGIN:VEVENT SUMMARY:The micro-RWELL detector DTSTART;VALUE=DATE-TIME:20170302T041000Z DTEND;VALUE=DATE-TIME:20170302T043000Z DTSTAMP;VALUE=DATE-TIME:20261014T231454Z UID:indico-contribution-194-1684@indico.inp.nsk.su DESCRIPTION:Speakers: Giovanni Bencivenni (LNF - INFN)\nThe R&D on the mic ro-Resistive-WELL (μ-RWELL) detector technology aims in developing a new scalable\, compact\, spark-protected\, single amplification stage Micro-Pa ttern Gas Detectors (MPGD) for large area HEP applications as tracking and calorimeter device as well as for industrial and medical applications as X-ray and neutron imaging gas pixel detector. The novel micro-structure\, exploiting several solutions and improvements achieved in the last years f or MPGDs\, in particular for GEMs and Micromegas\, is an extremely simple detector allowing an easy engineering with consequent technological transf er toward the photolithography industry. Large area detectors (up 1x2 m2) can be realized splicing μ-RWELL_PCB tiles of smaller size (about 0.5x1 m 2 – typical PCB industrial size). The detector\, composed by few basic e lements such as the readout-PCB embedded with the amplification stage (thr ough the resistive layer) and the cathode defining the gas drift-conversio n gap has been largely characterized on test bench with X-ray and with bea m test\n\nhttps://indico.inp.nsk.su/event/8/contributions/1684/ LOCATION: URL:https://indico.inp.nsk.su/event/8/contributions/1684/ END:VEVENT BEGIN:VEVENT SUMMARY:Precise Calibration of Large Area Micromegas Detectors Using Cosmi c Rays DTSTART;VALUE=DATE-TIME:20170302T045000Z DTEND;VALUE=DATE-TIME:20170302T051000Z DTSTAMP;VALUE=DATE-TIME:20261014T231454Z UID:indico-contribution-194-1708@indico.inp.nsk.su DESCRIPTION:Speakers: Maximilian Herrmann (LMU Munich)\nCurrently m$^2$-si zed micropattern detectors with spatial resolution better than 100 $\\mu$m and online trigger capability are of big interest for many experiments. \ nLarge size in combination with superb spatial resolution and trigger capa bility implicates that the construction of these detectors is highly sophi sticated and imposes strict mechanical tolerances. \nWe developed a method to survey assembled and working detectors on potential deviations of the micro pattern readout structures from design value as well as deformations of the whole detector\, using cosmic muons in a tracking facility.\n\nThe LMU Cosmic Ray Facility consists of two 8 m$^2$ ATLAS Monitored Drift Tub e chambers (MDT) for precision muon reference tracking and two segmented t rigger hodoscopes with sub-ns time-resolution and additional 10 cm positio n information along the wires of the MDTs. \nIt provides information on ho mogeneity in efficiency and pulse height of one or several micropattern de tectors installed in between the MDTs.\nWith an angular acceptance of $-30 ^\\circ$ to +30$^\\circ$ the comparison of the reference muon tracking wit h centroidal position determination or time projection chamber like track reconstruction in the micropattern detector allows for calibration in thre e dimensions. \n \nWe present results of a m$^2$-sized one-dimensional resistive strip Micromegas detector consisting of two readout boards with in total 2048 strips\, read out by 16 APV25 front-end boards.\nThis 16-fol d segmentation along the precision direction in combination with a 10-fold segmentation in orthogonal direction by the resolution of the trigger hod oscope\, allows for very detailed analysis of the 1 m$^2$ detector under s tudy by subdivision into 160 partitions\, each being analyzed separately.\ n\nWe are able to disentangle deviations from the readout strip straightne ss and global deformation due to the small overpressure caused by the Ar:C O$_2$ gas flux. \n\nWe introduce the alignment and calibration procedure\ , report on homogeneity in efficiency and pulse height and present results on deformation and performance of the m$^2$-sized Micromegas.\n\nhttps:// indico.inp.nsk.su/event/8/contributions/1708/ LOCATION: URL:https://indico.inp.nsk.su/event/8/contributions/1708/ END:VEVENT BEGIN:VEVENT SUMMARY:A new technique for assembling large-size GEM detectors and its ex perimental results DTSTART;VALUE=DATE-TIME:20170302T030000Z DTEND;VALUE=DATE-TIME:20170302T032000Z DTSTAMP;VALUE=DATE-TIME:20261014T231454Z UID:indico-contribution-194-1738@indico.inp.nsk.su DESCRIPTION:Speakers: Wenhao You (University of Science and Technology of China)\nGEM detectors have been successfully used in modern nuclear and pa rticle physics experiments. The key to the GEM application at large-scale experiments is cost-effective realization of large-size detectors\, in whi ch development of GEM detector assembly techniques plays a key role. The d etector group at the University of Science and Technology of China (USTC) has been conducting intensive R&D on large-size GEM detectors\, particular ly on assembly techniques of GEM detectors\, since 2013. The main aim is t o build up technology for constructing the tracking detector at the SoLID experiment proposed for the 12-GeV upgrade program at JLab.\n\nWe started large-size GEM R&D by implementing the self-stretching GEM assembly techni que developed at CERN for the CMS Muon GEM upgrade project\, and gained a great deal of experience with the self-stretching technique through large- size GEM detector prototyping. \n\nFrom our implementation and practice of the self-stretching technique\, we found a major disadvantage of the tech nique in application for very large GEM detectors with size larger than 1m . When GEM foil size reaches over 1m\, the overall foil extension of a tri ple-GEM under tension of ~ 5N/cm can be as large as ~2.5mm. This was preci sely measured by a dedicated GEM stretching test station. The screws used to stretch foils would then be pulled by the inner frames and tilted towar ds the GEM stretching direction\, and finally exceed the tolerance of the screw hole size and get blocked. This would result in partial application of stretching force to the foils and improper setting of O rings in the sc rew holes which could further cause gas leakage. In view of these problems \, we have developed a new GEM stretching technique called “sliding self -stretching” based upon the original self-stretching technique. In this new technique\, the nuts are fixed by the main frame which forces the stre tching screws to keep vertical to the side-plane of the mainframe\, and th e GEM foils can move freely up to 5mm with respect to the main frame. With this sliding self-stretching technique\, GEM foils as large as ~1m can st ill be stretched very uniformly while gas tightness is ensured. A large-s ize GEM prototype (1m×0.5m) has been successfully built with this new tec hnique\, demonstrating the advantage of the sliding self-stretching techni que over the original one in large-size GEM assembly. The GEM prototype wa s thoroughly tested in terms of uniformity and effective gain. In order to test the spatial resolution of the prototype\, we have built a GEM readou t system based on APV25. As the first step\, we tested a 30 cm×30 cm GEM detector with the readout system\, and obtained a good result.\n\nThis rep ort presents the details of the sliding self-stretching technique for larg e-size GEM assembly and test results of a large-size GEM prototypes built with the technique. The performance of the GEM prototypes is also compare d to that of large-size GEM detectors built with other techniques.\n\nhttp s://indico.inp.nsk.su/event/8/contributions/1738/ LOCATION: URL:https://indico.inp.nsk.su/event/8/contributions/1738/ END:VEVENT BEGIN:VEVENT SUMMARY:The new Cylindrical GEM Inner Tracker of the BESIII experiment: te st beam results of two prototypes. DTSTART;VALUE=DATE-TIME:20170302T020000Z DTEND;VALUE=DATE-TIME:20170302T022000Z DTSTAMP;VALUE=DATE-TIME:20261014T231454Z UID:indico-contribution-194-1764@indico.inp.nsk.su DESCRIPTION:Speakers: Lia Lavezzi (INFN and IHEP)\nA cylindrical GEM detec tor is under development\, to serve as an upgraded inner tracker at the BE SIII spectrometer. It will consist of three layers of cylindrically-shaped triple GEMs surrounding the interaction point. The experiment is taking d ata at the e$^{+}$e$^{-}$ collider BEPCII in Beijing (China) and the GEM t racker will be installed in 2018. \nTests on the performances of triple GE Ms in strong magnetic field have been run by means of the muon beam availa ble in the H4 line of SPS (CERN) with both planar chambers and the first c ylindrical prototype. Efficiencies and resolutions have been evaluated usi ng different gains\, gas mixtures\, with and without magnetic field.\nThe obtained efficiency is larger than 95%\, in many operational arrangements. \nThe spatial resolution for planar GEMs has been evaluated with two dif ferent algorithms for the position determination: the charge centroid and the micro time projection chamber (TPC) methods. The two modes are complem entary and are able to cope with the asymmetry of the electron avalanche w hen running in magnetic field\, and with non-orthogonal incident tracks. \ nWith the charge centroid\, a resolution lower than 100 microns has been r eached without magnetic field and lower than 200 microns with a magnetic f ield up to 1 T. The micro TPC mode showed to be able to improve those resu lts. \nIn the first beam test with the cylindrical prototype\, the detecto r had a very good stability under different voltage configurations and par ticle intensities. The resolution evaluation is in progress.\n\nhttps://in dico.inp.nsk.su/event/8/contributions/1764/ LOCATION: URL:https://indico.inp.nsk.su/event/8/contributions/1764/ END:VEVENT END:VCALENDAR