gain calibration of large prototypes

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 III5/16

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

Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III8/16

Gain Calibration of Large Prototypes

Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III

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

Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III

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

Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III

Gain Stability GE1/1-II

Sectors

From Laura Franconi (2011)

From Laura Franconi (2011)

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Gain Calibration of Large Prototypes

Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III

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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Gain Calibration of Large Prototypes

Jeremie MERLIN April 20,2012CMS GEM Upgrade Workshop III

Thank you

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