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GEMs for CMS Upgrade

GEMs for CMS Upgrade. Muons are quite central to most of the Physics that would unfold from “C M S” Triggering and tracking with muons , is therefore a challenging task : Detector R&D (Hardware techniques) Instrumentation and Trigger generation (Software development)

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GEMs for CMS Upgrade

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  1. GEMs for CMS Upgrade • Muons are quite central to most of the Physics • that would unfold from “CMS” • Triggering and tracking with muons, is therefore • a challenging task : • Detector R&D (Hardware techniques) • Instrumentation and • Trigger generation (Software development) • Muon detectors are in the peripheral regions • of the calorimeter, they tend : • to be large sized in areas ( 1 to 2 m2) • to have a larger granularity in the forward region • with excellent timing capabilities •  wide acceptance and robust triggering India CMS Meeting, BARC, 28 July 2011

  2. Physics for high eta region • Standard Model precision measurement : • high-η : Z production for backward-forward asymmetry studies (important for pdf) • precise measurements of electroweak processes where barrel is not enough (low-pT : J/ψ, Υ) • Exotica (new physics at 7-8 TeV mass scale) : • Heavy-resonances (with possible multi-leptons signatures) • New heavy HSCP which may need precision timing India CMS Meeting, BARC, 28 July 2011

  3. Initial RPC end-cap system Reduced RE system |η| < 1.6 η =2.4 η=2.4 Scenario with a double GE1/1 and a single GE2/1 station in each endcap India CMS Meeting, BARC, 28 July 2011

  4. Forward Muon RPC Trigger system CMS GE1/1 ?? The Forward Muon RPC trigger system is equipped with detectors at η < 1.6, the high η region of CMS is presently vacant and presents an opportunity to instrument it with a detector technology that could sustain the environment and be suitable for operation at the LHC and its future upgrades. India CMS Meeting, BARC, 28 July 2011

  5. The harsh environment India CMS Meeting, BARC, 28 July 2011

  6. 3 GEM layers on either side  = 1.6  = 2.1 GE 1/1 Double station 20o chambers 2 x 18 = 36 GE 1/1 Double station 20o chambers 2 x 18 = 36 72 + 8 spares = 80 GE 2/1 Single station 10o chambers 1 x 36 = 36 GE 2/1 Single station 10o chambers 1 x 36 = 36 72 + 8 spares = 80 Total 160 chambers @ 7 kCHF India CMS Meeting, BARC, 28 July 2011

  7. Cost of GEM based upgrade 160 GEMs in 3 layers () 1 kCHF Rs. 50,000/- Total Cost : 5 MCHF  Rs. 25 Crore This is in additional to 65 MCHF total given in the upgrade technical proposal India CMS Meeting, BARC, 28 July 2011

  8. The GEM collaboration • The GEM collaboration currently comprises • 76 collaborators • 14 institutions Bari (INFN & Univ.), Beijing, CERN, Delhi, Florida Tech, Frascati, Gent, Islamabad (NCP), Kolkata, Mumbai (BARC & TIFR), Napoli, INFN Pisa/Siena, Warsaw, and Wayne State • 7 countries (plus CERN) Belgium, China, India, Italy, Pakistan, Poland, USA + CERN • Additional groups are interested in joining: • ULB Brussels, Belgium (Gilles De Lentdecker) • Tsinghua U., China (ChunhuaJian) • Panjab University, India (Jasbir B. Singh) • KODEL, Seoul, Korea (Sung Park) India CMS Meeting, BARC, 28 July 2011

  9. Present need for resources • In the present project stage resources are needed/used for : • construction of small and large prototypes • (mechanics, electronics, HV dividers, detector mockup ...) • lab equipment and consumables • instrumentation and running during test beam campaigns India CMS Meeting, BARC, 28 July 2011

  10. GEM double mask vs. single mask Base material : Polyimide 50 µm + 5 µm Cu on both sides • Double mask • Single mask • Base material • Hole patterning in Cu • Polyimide etch • Bottom electro etch • Second Polyimide Etch • limited to 40 cm x 40 cm • mask precision • limited to 2 m x 60 cm India CMS Meeting, BARC, 28 July 2011

  11. Present GEM foil : 1.2 m x 0.6 m Future GEM foils : 2m x 0.6 m India CMS Meeting, BARC, 28 July 2011

  12. Proposed Indian contribution  = 1.6 GE 2/1, Single station, 10o chambers, 1 x 36 = 36 Cost : 1125 kCHF (22% of the projected cost) :  Rs. 6 Crore Institutes : NPD-BARC, PU-Chandigarh, SINP, ?, ? Cost / Institute : Rs. 2 Crore [12th plan (2012-2017); 13th plan] Other Indian : cost per institute reduces or Institutes : one could take up extra layers Joining  = 2.1 India CMS Meeting, BARC, 28 July 2011

  13. NPD-BARC and GEMs : 1 of 4 NPD-BARC has expressed its interest (EoI) : Sep 2010 workshop on MPGDs at CERN The necessary infrastructure exists at NPD-BARC for handling the project 3. BARC, as a whole, is planning to join the RD51 collaboration (procedures in the pipeline) 4. A triple GEM (10 cm x 10 cm) procured from CERN is being configured in RPC Lab., at NPD-BARC 5. Gas mixing system arranged for the GEM (Ar:CO2 :: 70:30) 6. Reactive Ion Etching of polymide surface being studied with RF plasma in a local industry 7. Clean volume for GEM operation being augmented 8. Linkages to the existing programmes : RPCs for CMS India CMS Meeting, BARC, 28 July 2011

  14. NPD-BARC and GEMs : 2 of 4 200 X magnification of a GEM foil • Rejected Gem foil • Cu etched on one side • Polyamide film visible • within the circles • Hole diameter  70 µm • Pitch  140 µm • Equilateral triangle • symmetry • The surface quality of GEM does not appear to be good Cu 70 µm 140 µm India CMS Meeting, BARC, 28 July 2011

  15. NPD-BARC and GEMs : 3 of 4 Preparations for dry etching of GEM foils RIE machine for dry etching of polymide surface between the etched copper in a local industry India CMS Meeting, BARC, 28 July 2011

  16. NPD-BARC and GEMs : 4 of 4 • GEMs active area: 10 x 10 cm2 • Double mask triple GEM • 1D readout (128 ch on X) • Strip pitch = 0.8mm • Gas mixture : Ar/CO2(70/30) • Gas flow : 5 litres per hour • Test with an X-ray source To do : Triple GEM to be configured for tests Drift Drift gap 3.00 mm GEM3T • Manpower • Scientist : 2 • Assistant : 1 • Need student : 1 GEM3B T1 1.00 mm GEM2T GEM2B 1.00 mm T2 GEM1T GEM1B Induction gap 1.00 mm Anode India CMS Meeting, BARC, 28 July 2011

  17. Assembly procedures : 2-3 hours GEM foil with the protection resistors Read-Out board, bottom plane Read-Outboard, top plane, connector Frame for stretching Placing the foil Mounting the frame and stretching Stretched GEM foil Placing the Read-Out India CMS Meeting, BARC, 28 July 2011

  18. Slides sent by Supratik from SINP GEMs for CMS Saha Institute of Nuclear Physics India CMS Meeting, BARC, 28 July 2011

  19. Slides sent by Supratik from SINP Fields of Interest • Experiment • Optimization of design parameters: spacer and drift electrode • Measurement of detector dynamics: gain, ion back-flow, gas flow • Simulation • Characteristic responses: gain and signal in magnetic field • Dynamics related issues: transparency, efficiency, ion back-flow, efficiency, charging up, gas flow • Effect of design parameters: spacer, driftelectrode • Gas composition In-Beam Tests Data Analysis India CMS Meeting, BARC, 28 July 2011

  20. Slides sent by Supratik from SINP Resources • Expertise • Experiment:experience of working in both low energy and high energy nuclear physics experiments at various national and international accelerator facilities, operation and testing of detectors (gaseous, solid state, scintillator), fluid dynamics, data analysis • Programming and simulation:development of electrostatic field solver (neBEM), interface of neBEM with GARFIELD (RD51 collaboration WG4), detailed field and response simulation of MPGDs, fluid dynamics • Infrastructure: • MPGD laboratory with necessary gas flow unit and electronics, XYZ precision positioning system • Blade servers, high-end work stations • Personnel (current status) • Faculty: 3 • Student: 1 • Technician: 2 India CMS Meeting, BARC, 28 July 2011

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