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USCMS Collaboration Meeting, Boulder, CO, May 17, 2012 (via EVO)

CMS R&D Project: GEM Upgrade in Muon Endcap Marcus Hohlmann Florida Institute of Technology (for the CMS GEM Collaboration). USCMS Collaboration Meeting, Boulder, CO, May 17, 2012 (via EVO). Premise for Project. CMS was designed to have a highly redundant m uon system

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USCMS Collaboration Meeting, Boulder, CO, May 17, 2012 (via EVO)

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  1. CMS R&D Project: GEM Upgrade in Muon EndcapMarcus HohlmannFlorida Institute of Technology(for the CMS GEM Collaboration) USCMS Collaboration Meeting, Boulder, CO, May 17, 2012 (via EVO)

  2. Premise for Project • CMS was designed to have a highly redundant muon system • CMS currently has the least redundancy in the most challenging muon region at high η(|η| > 1.6) (because RPCs originally planned there were descoped) • Long-term functioning of the muon system into LHC Phase II is of vital interest for CMS • The high-η muon region in particular needs robust and redundant tracking and triggering capability in the long run; •  Additional robust muon detectors with high spatial and temporal resolution installed in the high-η endcap region can bring benefits in muon triggering, reconstruction, and ID for the medium and long term USCMS Coll. Meeting - M. Hohlmann

  3. GEM Endcap Chambers The currently un-instrumented high- RPC region of the muon endcaps presents an opportunity for instrumentation with a detector technology that could sustain the radiation environment long-term and be suitable for operation at the LHC and its future upgrades into Phase II: GEM Detectors GE1/1 in YE1 nose GE3/1 GE4/1 GE2/1 on back of YE1 USCMS Coll. Meeting - M. Hohlmann

  4. Rate Environments GEM Detectors are proven high-rate detectors with little propensity for aging under accumulated charge USCMS Coll. Meeting - M. Hohlmann

  5. Initial Reconstruction & Trigger Studies & Potential Physics Impact Expected gains in momentum resolution at high-pT Acceptance impact:  distribution of 4 muons in H  ZZ  4µ 1.6<<2.4 M. Maggi (Bari) – GEM Wkshop 3 Paolo Giacomelli (Bologna) & Markus Klute (MIT) – GEM Wkshop 3 Simulated L1 RPC muon pattern trigger turn-on curves With GE1/1 + GE2/1 (8× strips) RE1/1-4/1 only # GEM strips / # RPC strips per orig. TDR (Warsaw) – TP USCMS Coll. Meeting - M. Hohlmann

  6. R&D Project Milestones • 2009 • Small prototypes, bench tests; picked GEMs among MPGDs for further study • Established that 4 ns time resolution achievable • Large-area GEM foils become available • 2010 • First large-area GE1/1 prototype; beam test • Workshop 1 • SLHC R&D proposal 10.02 submitted to CMS • 2011 • Second redesigned GE1/1 prototype (smaller gaps b/w GEMs) • “GEM Collaboration (GEMs for CMS)” constitutes itself in May CMS week (76 collaborators from 15 inst.) • Summer beam tests (including first test in CMS test magnet) • Established 100µm (300µm) res. with analog (binary) r/o chip • “Self-stretch” GEM foil assembly technique w/o spacers • Preliminary electronics design starts • Workshop 2 & Project presented to Muon Institution Board USCMS Coll. Meeting - M. Hohlmann

  7. R&D Project Milestones cont’d • 2012 • Internal Technical Proposal for two stations GE1/1 & 2/1 in LS2 submitted to Upgrade Mgmt. (Feb, CMS IN 2012-001, 104 pp., 35 inst., 176 signatories) • Internal peer review organized by CMS Upgrade Project Office (March) • Much interest in technology • Concerns raised about projected project cost (~ 6.5M CHF, mainly in electronics) • Suggestion: scaled-down “demonstrator system” in context of overall CMS muon upgrade strategy • Workshop 3 (April; 3 days) • Formally approved as R&D project of interest to CMS: RD10.02 (April 20) … … http://cmsdoc.cern.ch/cms/electronics/html/elec_web/docs/slhcusg/proposals/proposal_list.htm • Construction of 4 production-style GE1/1 prototypes (May) • 5 weeks of beam test for 3 GE1/1 with RD51 coll. at SPS (June-July) USCMS Coll. Meeting - M. Hohlmann

  8. GEM Collaboration & USCMS Participation by USCMS groups • Fl. Tech: detector R&D and production, beam tests, mgmt. • Wayne State: beam tests & electronics • Texas A&M: interest in trigger studies • Purdue Calumet: interest in simulations • U. Virginia (tbc): interest in detector R&D • Northwestern: interest in muon reconstruction and physics studies CMS GEM Collaboration (institutes signing 2012 TP)  Good spectrum of tasks for USCMS institutions USCMS Coll. Meeting - M. Hohlmann

  9. Gas Electron Multiplier GEM detector is a Micro Pattern Gaseous Detector (MPGD) V=const. GEM foil under electron microscope ~400 V μ- e- F. Sauli, NIM A 386 (1997) 531-534. M.C Altunbas, et al., NIM A 515 (2003) 249-254. Gas Gain ~ O(104) USCMS Coll. Meeting - M. Hohlmann

  10. GE1/1: Prototypes, Design, Installation Framed GEM foil for GE1/1 prototype I GE1/1 positioning in YE1 nose Assembled GE1/1 prototype CurrentGE1/1 production design w/ FE electronics & cooling Integration studies show there is enough space to insert overlapping sandwiches of two Triple-GEM detectors (Super-Chambers) USCMS Coll. Meeting - M. Hohlmann

  11. GEM Production: CERN & Industry • INDUSTRY:New Flex, Seoul, S. Korea • Technology transfer from CERN ongoing • Small-size foils produced and tested with good results: • Large-size foils being tried gradually CERN:Currently located in building 102; well suited for prototyping & small series productions; new machines in 2011/12 Will move to new building w/ better infrastructure: TE-MPE-EM F. Formenti / R. De Oliveira Gain comparison CERN vs. New Flex GEMs Expected rate for 2012 : 250 GEMs / year CERN Need O(1000 m2) GEM foils for project  Next year the workshop will be capable of processing GEM foils of sizes up to 2m × 0.6m (0.6m imposed by raw material) USCMS Coll. Meeting - M. Hohlmann

  12. Baseline Electronics Design Radial readout strips: 3  columns 10  rows (new chip designs; 64 or 128 ch.) Design based on GigaBit Transceiver (GBT) architecture (CERN-wide DAQ R&D project on data transfers with multi-Gbps speed for SLHC experiments) Components for GE1/1 10o super-chamber (2 ch.): Implementation targeted for 2015 Effort led by Paul Aspell, CERN USCMS Coll. Meeting - M. Hohlmann

  13. Plans Hardware • Near-term: To be established in summer 2012 beam test: • Viability of self-stretched, spacerless, large-area GE1/1 chambers • 4ns time resolution in large-area GE1/1 chambers with optimized E-fields • Spatial resolution of zigzag strip readout & reduced channel count (cost saver!) • Medium-term: Installation of 4-6 GE1/1 production chambers in CMS during LS1 is under investigation with help from TC • Window for full installation in YE1 nose looks very tight due to ME1/1 work • Installation of dummies in GE1/1 region to practice installation procedure • Alternative chamber installation on “blockhouse” • Targeting readout with first prototype of final DAQ using GBT and µTCA • Long-term: Installation of a demonstrator system in LS2 • 90o sector in all 4 muon stations in one endcap Software • Develop G4 simulation tools for GEM system and integrate into CMSSW • Detailed muon reconstruction and physics studies of expected performance USCMS Coll. Meeting - M. Hohlmann

  14. Thank you! P.S. Planning on presenting more details on the GEM Upgrade Project at FNAL LPC in July (Topic of the Week)

  15. Backup slides USCMS Coll. Meeting - M. Hohlmann

  16. Single-mask GEM foil production 1 Base material 50 µm polyimide foil copper clad Chemical Polyimide etching 2 Photoresist lamination, masking, exposure, development 3 Chemical etching of copper Top Copper electro etching 4 Polyimide etching in 2 steps 5 Stripping Electrochemical etching of copper Bot etched 6 Polyimide etching to transform hole geometry R. De Oliveira S. Ferry 7 Photoresist lamination, masking, exposure, development to define electrodes 8 Chemical etching of copper Top and Bot, Cleaning and electrical test Reality USCMS Coll. Meeting - M. Hohlmann

  17. GEM Rate Capabilities & Aging • Gain of 2x104 • Total integrated charge of 13 C/cm2 expected in 10 years of tracker operation in LHCb • 50 MHz/cm2 X-rays, in 10 days a total charge of 20 C/cm2 was integrated; Less than 5% change in the chamber gain LHCb M. Alfonsi, et al. 2004 CMS high-h: maximum integrated charge USCMS Coll. Meeting - M. Hohlmann

  18. CMS GE1/1 Aging Tests Proto II lead shield Jeremie MERLIN Christopher ARMAINGAUD Long-term test (≥ 6 months) is about to start at CERN GIF USCMS Coll. Meeting - M. Hohlmann

  19. Frontend Electronics Options P. Aspell USCMS Coll. Meeting - M. Hohlmann

  20. Electronics Planning P. Aspell USCMS Coll. Meeting - M. Hohlmann

  21. GE1/1 Mechanical Design New position of HV Divider New Cooling Pipe and copper Sheets DC-DC Converters Electronic GBT’s A. Conde Garcia, CERN USCMS Coll. Meeting - M. Hohlmann

  22. Exploded GE1/1 View Cover VFAT Connectors & Hybrids now rotated 90° A. Conde Garcia, CERN USCMS Coll. Meeting - M. Hohlmann

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