gain calibration of large prototypes
DESCRIPTION
Gain Calibration of Large Prototypes. CMS GEM Upgrade Workshop III Jeremie MERLIN ( University of Strasbourg * ). April 20,2012. * Also at Telecom Physique Strasbourg. Gain Calibration of Large Prototypes. Introduction. Proto I. GE1/1 - Full-size Prototypes : Proto I : - PowerPoint PPT PresentationTRANSCRIPT
Gain Calibration of Large Prototypes
CMS GEM Upgrade Workshop III
Jeremie MERLIN(University of Strasbourg*)
* Also at Telecom Physique Strasbourg April 20,2012
Gain Calibration of Large Prototypes
Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III
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)
Introduction Proto I
Proto II
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Gain Calibration of Large Prototypes
Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III
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
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Gain Calibration of Large Prototypes
Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III
Calibration Procedure
GE1/1 – prototype I
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Gain Calibration of Large Prototypes
Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III
Pulse Height Spectrum Acquisition
Bremsstrahlung effect from the Aluminum sheet (covering the chamber)
8 keV
5 keV
From Laura Franconi (2011)
Triple GEM Proto GE1/1-I (3/2/2/2) Ar/CO2 – 70/30
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Gain Calibration of Large Prototypes
Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III
3800 3900 4000 4100 4200 4300 4400 4500 4600 4700 48000
500
1000
1500
2000
2500
3000
3500
4000
Rate
Sector 2-3
Count Rate Measurement
Hz
HV (V)
Triple GEM Proto GE1/1-I (3/2/2/2) Ar/CO2 – 70/30
Operating Region
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Gain Calibration of Large Prototypes
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4250 4350 4450 4550 4650 47501000
10000
100000
Sector 2-3
Sector 1-3
Sector 1-2
Sector 2-2
Sector 2-4
Sector 1-4
Sector 2-1
Sector 1-1
Effective Gain
HV (V)
Gain CalibrationTriple GEM Proto GE1/1-I (3/2/2/2) Ar/CO2 – 70/30
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Gain Calibration of Large Prototypes
Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III
Calibration Procedure
GE1/1 – prototype II
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Gain Calibration of Large Prototypes
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GE1/1-II
Sectors
Pulse Height Spectrum AcquisitionTriple GEM Proto GE1/1-II (3/1/2/1) Ar/CO2/CF4 – 45/15/40
11/16ADC Chanels
Coun
ts
8 keV
5 keVBremsstrahlung
Gain Calibration of Large Prototypes
Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III
GE1/1-II
Sectors
Count Rate MeasurementTriple GEM Proto GE1/1-II (3/1/2/1) Ar/CO2/CF4 – 45/15/40
3800 3900 4000 4100 4200 4300 4400 4500 46000
100
200
300
400
500
600
700
800
900
Sector 3-7Sector 2-7Sector 1-7Sector 1-8Sector 2-8Sector 3-8Sector 3-6Sector 2-6Sector 3-5Sector 1-6Sector 2-5Sector 1-5Sector 2-3Sector 2-4Sector 2-2Sector 2-1
Operating Region
HV (V)
Hz Rate
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87
65
43
21
1E+03
1E+04
1E+05
1
2
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Gain Calibration of Large Prototypes
Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III
GE1/1-II
Sectors
Triple GEM Proto GE1/1-II (3/1/2/1) Ar/CO2/CF4 – 45/15/40
Gain Calibration
3800 3900 4000 4100 4200 4300 4400 4500 4600100
1000
10000
100000 Sector 3-7Sector 2-7Sector 1-7Sector 1-8Sector 2-8Sector 3-8Sector 3-6Sector 2-6Sector 1-6Sector 3-5Sector 2-5Sector 1-5Sector 2-3Sector 2-4Sector 2-2Sector 2-1
HV (V)
Effective Gain
Secto
rs
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Gain Calibration of Large Prototypes
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Gain Stability GE1/1-II
Sectors
From Laura Franconi (2011)
From Laura Franconi (2011)
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Gain Calibration of Large Prototypes
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Ongoing projectsGE1/1 – 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 …
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Thank you
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