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GEM Upgrade in Muon Endcap for CMS: Increasing Redundancy and Improving Tracking Capability

This project aims to install additional GEM detectors in the high-η muon endcap region of CMS to enhance muon triggering, reconstruction, and identification capabilities.

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GEM Upgrade in Muon Endcap for CMS: Increasing Redundancy and Improving Tracking Capability

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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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