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CMS R&D Project: GEM Upgrade in Muon Endcap Marcus Hohlmann Florida Institute of Technology (for the CMS GEM Collaboration) USCMS Collaboration Meeting,

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Presentation on theme: "CMS R&D Project: GEM Upgrade in Muon Endcap Marcus Hohlmann Florida Institute of Technology (for the CMS GEM Collaboration) USCMS Collaboration Meeting,"— Presentation transcript:

1 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)

2 Premise for Project 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 2 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

3 GEM Endcap Chambers 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 3 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 GE3/1 GE4/1 GE1/1 in YE1 nose GE2/1 on back of YE1

4 Rate Environments 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 4 RegionLHC (10 34 cm 2 /s) High Luminosity LHC (2-3 × LHC) Phase II (10 35 cm 2 /s) Forward Rates [Hz/cm 2 ] ME,RE 1,2,3,4 | 30Few 100~ kHz (tbc) Expected accumulated charge in10 years 0.05 C/cm C/cm 2 ~ C/cm 2 Forward Rates [Hz/cm 2 ] GE 1,2,3,4 | Few kHz/cm 2 Few 10s of kHz/cm 2 Expected accumulated charge in10 years (0.05-1) C/cm 2 few C/cm 2 several C/cm 2 GEM Detectors are proven high-rate detectors with little propensity for aging under accumulated charge

5 Initial Reconstruction & Trigger Studies & Potential Physics Impact 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 5 M. Maggi (Bari) – GEM Wkshop 3 # GEM strips / # RPC strips per orig. TDR Acceptance impact: distribution of 4 muons in H ZZ 4µ Expected gains in momentum resolution at high-p T Paolo Giacomelli (Bologna) & Markus Klute (MIT) – GEM Wkshop 3 1.6< <2.4 Simulated L1 RPC muon pattern trigger turn-on curves RE1/1-4/1 only With GE1/1 + GE2/1 (8× strips) (Warsaw) – TP

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 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 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 6

7 R&D Project Milestones contd 2012 –Internal Technical Proposal for two stations GE1/1 & 2/1 in LS2 submitted to Upgrade Mgmt. (Feb, CMS IN , 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) 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 7 –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) … …

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 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 8 CMS GEM Collaboration (institutes signing 2012 TP) Good spectrum of tasks for USCMS institutions

9 Gas Electron Multiplier 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 9 μ-μ- e-e- GEM foil under electron microscope V=const. ~400 V Gas Gain ~ O (10 4 ) GEM detector is a Micro Pattern Gaseous Detector (MPGD) F. Sauli, NIM A 386 (1997) M.C Altunbas, et al., NIM A 515 (2003)

10 GE1/1: Prototypes, Design, Installation 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 10 Integration studies show there is enough space to insert overlapping sandwiches of two Triple-GEM detectors (Super-Chambers) GE1/1 positioning in YE1 nose Framed GEM foil for GE1/1 prototype I Assembled GE1/1 prototype Current GE1/1 production design w/ FE electronics & cooling

11 GEM Production: CERN & Industry 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 11 CERN: Currently located in building 102; well suited for prototyping & small series productions; new machines in 2011/12 Next year the workshop will be capable of processing GEM foils of sizes up to 2m × 0.6m (0.6m imposed by raw material) TE-MPE-EM F. Formenti / R. De Oliveira Expected rate for 2012 : 250 GEMs / year Will move to new building w/ better infrastructure: 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 Gain comparison CERN vs. New Flex GEMs Need O (1000 m 2 ) GEM foils for project CERN

12 Baseline Electronics Design 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 12 Effort led by Paul Aspell, CERN Radial readout strips: 3 columns 10 rows (new chip designs; 64 or 128 ch.) Implementation targeted for 2015 Components for GE1/1 10 o super-chamber (2 ch.): Design based on GigaBit Transceiver (GBT) architecture (CERN-wide DAQ R&D project on data transfers with multi-Gbps speed for SLHC experiments)

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 –90 o 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 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 13

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 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 15

16 Single-mask GEM foil production 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 16 Base material 50 µm polyimide foil copper clad Photoresist lamination, masking, exposure, development Chemical etching of copper Top Polyimide etching in 2 steps Electrochemical etching of copper Bot etched Polyimide etching to transform hole geometry Photoresist lamination, masking, exposure, development to define electrodes Chemical etching of copper Top and Bot, Cleaning and electrical test Chemical Polyimide etching Copper electro etching Stripping Reality R. De Oliveira S. Ferry

17 GEM Rate Capabilities & Aging 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 17 Gain of 2x10 4 Total integrated charge of 13 C/cm 2 expected in 10 years of tracker operation in LHCb 50 MHz/cm 2 X-rays, in 10 days a total charge of 20 C/cm 2 was integrated; Less than 5% change in the chamber gain CMS high- : maximum integrated charge LHCb M. Alfonsi, et al. 2004

18 CMS GE1/1 Aging Tests 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 18 Proto II lead shield Jeremie MERLIN Christopher ARMAINGAUD Long-term test ( 6 months) is about to start at CERN GIF

19 Frontend Electronics Options 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 19 P. Aspell

20 Electronics Planning 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 20 P. Aspell

21 GE1/1 Mechanical Design 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 21 New position of HV Divider New Cooling Pipe and copper Sheets DC-DC Converters Electronic GBTs A. Conde Garcia, CERN

22 Exploded GE1/1 View 5/17/2012 USCMS Coll. Meeting - M. Hohlmann 22 Cover VFAT Connectors & Hybrids now rotated 90° A. Conde Garcia, CERN


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