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Gain Calibration of Large Prototypes

This document summarizes the proceedings of the CMS GEM Upgrade Workshop III held on April 20, 2012, at the University of Strasbourg. Led by Jeremie Merlin, the workshop focused on gain calibration techniques for large prototypes, specifically for configurations GE1/1 Proto I and Proto II. The calibration procedures addressed measurement of count rates, pulse height spectra, and gain stability using various gas mixtures. The workshop presented insights into the development and evaluation of full-size prototypes and the effects of different setups on performance metrics.

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Gain Calibration of Large Prototypes

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  1. Gain Calibration of Large Prototypes CMS GEM Upgrade Workshop III Jeremie MERLIN (University of Strasbourg*) April 20,2012 * Also at Telecom Physique Strasbourg

  2. Gain Calibration of Large Prototypes Introduction Proto I • GE1/1 - Full-size Prototypes : • Proto I : • - 99x(22-45) cm2 active area • - Single mask technology • - gaps : 3/2/2/2 (mm) • - 8 read-out sectors • - 1024 channels • - Strip pitch: 0.8 – 1.6 (mm) • Proto II : • - 99x(22-45) cm2 active area • - Single mask technology • - gaps : 3/1/2/1 (mm) • - 24 read-out sectors • - 3076 channels • - Strip pitch: 0.6 – 1.2 (mm) Proto II 2/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  3. Gain Calibration of Large Prototypes Calibration Procedure • Count rate measurement • Pulse height spectrum acquisition • Output current measurement • Gain stability • Setup : • Different mixtures : Ar/CO2 - 70/30 • Ar/CO2/CF4 – 45/15/40 • Xray (copper target) : 8 keV – 20 kV – 5 mA • collimator 2mm 3/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  4. Gain Calibration of Large Prototypes Calibration Procedure GE1/1 – prototype I 4/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  5. Gain Calibration of Large Prototypes 5/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  6. Gain Calibration of Large Prototypes Pulse Height Spectrum Acquisition Triple GEM Proto GE1/1-I (3/2/2/2) Ar/CO2 – 70/30 8 keV From Laura Franconi (2011) Bremsstrahlung effect from the Aluminum sheet (covering the chamber) 5 keV 6/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  7. Gain Calibration of Large Prototypes Count Rate Measurement Triple GEM Proto GE1/1-I (3/2/2/2) Ar/CO2 – 70/30 Hz Operating Region HV (V) 7/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  8. Gain Calibration of Large Prototypes 8/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  9. Gain Calibration of Large Prototypes Gain Calibration Triple GEM Proto GE1/1-I (3/2/2/2) Ar/CO2 – 70/30 HV (V) 9/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  10. Gain Calibration of Large Prototypes Calibration Procedure GE1/1 – prototype II 10/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  11. Gain Calibration of Large Prototypes Pulse Height Spectrum Acquisition Triple GEM Proto GE1/1-II (3/1/2/1) Ar/CO2/CF4 – 45/15/40 Counts GE1/1-II 8 keV 5 keV Sectors Bremsstrahlung ADC Chanels 11/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  12. Gain Calibration of Large Prototypes Count Rate Measurement Triple GEM Proto GE1/1-II (3/1/2/1) Ar/CO2/CF4 – 45/15/40 GE1/1-II Rate Hz Operating Region Sectors HV (V) 12/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  13. Gain Calibration of Large Prototypes Gain Calibration GE1/1-II Triple GEM Proto GE1/1-II (3/1/2/1) Ar/CO2/CF4 – 45/15/40 Effective Gain Sectors HV (V) Sectors 13/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  14. Gain Calibration of Large Prototypes Gain Stability GE1/1-II From Laura Franconi (2011) Sectors From Laura Franconi (2011) 14/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  15. Gain Calibration of Large Prototypes Ongoing projects GE1/1 – prototype III From Laura Franconi (2011) • No spacers in active area • Assembly time : 2 hours • No gluing, no soldering • Re-opening possible • GEM exchange possible • No stretch degradation with time • Stretching more intense • Frames less than 10 mm Coming soon … 15/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

  16. Gain Calibration of Large Prototypes Thank you 16/16 CMS GEM Upgrade Workshop III April 20,2012 Jeremie MERLIN

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