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A High Eta Forward Muon Trigger & Tracking detector for CMS

UPDATE AT RD51 COLLABORATION MEETING BARI. Beam Test Facilities Working Group - WG7. A High Eta Forward Muon Trigger & Tracking detector for CMS. Archana Sharma For CMS High Eta Upgrade Team (CMS, GDD and RD51) Oct 8-11, 2010. CMS - Redundant Muon System.

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A High Eta Forward Muon Trigger & Tracking detector for CMS

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  1. UPDATE AT RD51 COLLABORATION MEETING BARI Beam Test Facilities Working Group - WG7 A High Eta Forward Muon Trigger & Tracking detector for CMS ArchanaSharma For CMS High Eta Upgrade Team (CMS, GDD and RD51) Oct 8-11, 2010

  2. CMS - Redundant Muon System

  3. Initial RE system –tailored to budget Reduced RE system |h| < 1.6 h 2.4 h=2.4 STAGED

  4. Estimated Particle rates in Forward CMS

  5. Test Beam setup @ RD51 H4 Prevessin 5 CMS High Eta MPGD - Workshop, 30 September 2010

  6. Prototype Description 1/3 Triple GEM (standard) • GEMs active area: 10 x 10 cm2 • Double mask standard GEM • 1D readout • Gas mixture: • Ar/CO2 (70/30, 90/10) • Ar/CO2/CF4 (45/15/40, 60/20/20) • Gas flow: ~ 5 l/h Drift Drift gap 3.00 mm GEM3T GEM3B 1.00 /2.00 mm T1 GEM2T GEM2B T2 2.00 mm GEM1T GEM1B 1.00 /2.00 mm Induction gap Anode CMS High Eta MPGD - Workshop, 30 September 2010

  7. Prototype Description 2/3 Triple GEM (honeycomb) The GEM containing honeycomb worked without any problem during the data taking. Honeycomb will allow to avoid GEM foil stretching! CMS High Eta MPGD - Workshop, 30 September 2010

  8. Prototype Description 3/3 Triple GEM (single mask) • GEMs active area: 10 x 10 cm2 • Single mask GEM • 2D readout • Gas mixture: • Ar/CO2 (70/30, 90/10) • Ar/CO2/CF4 (45/15/40, 60/20/20) • Gas flow: ~ 5 l/h Drift Drift gap 3.25 mm GEM3T GEM3B 2.215 mm T1 GEM2T GEM2B T2 2.215 mm GEM1T GEM1B 2.15 mm Induction gap Anode This technlogyhas been used for large size detector and mass production!

  9. Data Analysis CMS High Eta MPGD - Workshop, 30 September 2010

  10. Data Analysis: Timing Studies Reached time resolution of 4ns () Ed=2KV/cm Et1= Et2 =3.0 KV/cm Ei=3KV/cm Et1= Et2 =3.0 KV/cm CMS High Eta MPGD - Workshop, 30 September 2010

  11. Data Analysis: Efficiency Studies Efficiency Plateau High achievable gain! CMS High Eta MPGD - Workshop, 30 September 2010

  12. Data Analysis: Honeycomb Honeycomb will allow to avoid GEM foil stretching! Efficiency=50% (data taking affected by grounding problem) Efficiency=70% GEOMETRIAL FACTOR rough est. 65% For RPC spacers take up more than 5% area (1cm circular spacer every 10cm) Efficiency=70% Efficiency loss will reduce with bigger cell size CMS High Eta MPGD - Workshop, 30 September 2010

  13. VFAT chip: Introduction The VFAT(TOTEM) is a digital on/off chip for tracking and triggering with an adjustable threshold for each of the 128 channels; it uses 0.25m CMOS technology and its trigger function provides programmable “fast OR” information based on the region of the sensor hit. • VFAT chip layout • Turbo board layout ANALOG AND ASYNCRONOUS DIGITAL AND SYNCRONOUS For prototype testing we used electronics developed by INFN (Siena and Pisa), based on the TOTEM VFAT chip. Without synchronous signal the VFAT introduces a jitter in the digital output ..for more details see Paul slides.. CMS High Eta MPGD - Workshop, 30 September 2010

  14. VFAT chip: clock issue VFAT output digital signals are synchronous to VFAT clock (40Mhz, 25ns), therefore the chip is introducing a jitter to the detector signal. This is especially critical when MSPL=1. Considering MSPL=1 (25ns) a gaussian time resolution with rms=5ns will work at full efficiency, the convoluted distribution no! 25ns CMS High Eta MPGD - Workshop, 30 September 2010

  15. Simulating LHC conditions In order to remove the VFAT jitter the clock of the chip and LHC should be synchronized to achieve fully efficiency. Considering MSPL=1 (25ns) a Gaussian time resolution with rms=5ns will work at full efficiency, the convoluted distribution no! CMS High Eta MPGD - Workshop, 30 September 2010

  16. High Gain Final Considerations Single mask technology • The TestBeams (June and August) demonstrated that prototype detectors fulfill all requirements: Good time resolution High Efficiency Good performance@LHC Fast electronics • The single mask GEM has been characterized with good performances. • The honeycomb detector demonstrated to work without problem, good candidate once reached better efficiency performances . • The detector+electronics works without issues. CMS High Eta MPGD - Workshop, 30 September 2010

  17. OUTLOOK FOR OCTOBERBEAM TEST Test the large area CMS prototype for: Gain uniformity, efficiency, noise, electronics ... Test small prototype in magnetic field CMS High Eta MPGD - Workshop, 30 September 2010

  18. GE1/1 Status and Plans

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