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The Preliminary Test and Plansof GEM Detector in Tsinghua
Rensheng Wang (王仁生 )Tsinghua U. (清华大学 )
The Third Workshop on Haron Physics in China and Opportunities with 12GeV JLab
Collaborators: Zhi-Gang Xiao, Zhao Zhang, Wei-Hua Yan, Han Yi, Ai-Xing Wang
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Outline:Brief introduction to GEM detectorThe set up of testSome results of testNear future plansSummary
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GEM at Tsinghua• TPC read-out based on GEM (See Talk by
Yulan LI)• 16 channel CSA and shaping amplifier (by
Zhi Deng)• … …
To start with a small GEM prototype, trying to study the energy resolution, space resolution and signal properties (like cluster size and broadening) varying with the high voltage, strip width and gas mixture. By comparing these measurements with the large prototype in the next step, we will know the effect of the large readout board size on the signal propagation.
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Brief introduction to GEM detector
-HV
Drift /Sensitive(~1-3kv/cm)
Transfer(~1-3kv/cm)
Induction(~1-3kv/cm)
Cathode
GEM1(300v-500v)
GEM2(300v-500v)
Anode/Readout strip
~2-30 mm
~1-2mm
~1-6mm
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The set up of testGEM foil (CERN):50mm*50mm
300um
400um
100um
200um
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The set up of test
Operating conditions:1,Atomosphere pressure;2,Active gases: Ar&Co2 : 75/25—90/10
Drift /Sensitive
Transfer
Induction
Cathode
GEM1
GEM2
Anode/Readout strip
2.625mm
2.25mm
1.625mm
-HV(1300V-1900V)1MΩ
13MΩ
20MΩ22MΩ20MΩ
16MΩ
… …
Charge-SensitivePreamplifier(16 channels)
Main Amplifier ADC
CFD
DAQ
Logical ORfoutGG8020
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The result of testThis test includes two sections:
16 in 1 : 16 adjacent strips are connected to one input, to test: energy resolution, effective gain;16 in 16 : 16 adjacent strips are connected individually with 16 preamplifiers input, to test:
Diagnose spectrum of signal;the energy resolution;the signal characters, such as the cluster size, high central moment … …
… …… …
Charge Amplifier
Charge Amplifier
… …
… …
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16 in 1
… …… …
Charge Amplifier
Fe55
Homemade
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16 in 1
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Charge Amplifier
… …
… …
Fe55
16 in 16
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16 in 16
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16 in 16Energy Resolution:
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16 in 16Cluster size of signal of main peak
-HV
1710
1750
Ar 75 80 85
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16 in 1616
i ii=1
16
ii=1
x ax =
a
16
2i i
2 i=116
ii=1
( ) a[ ]
a
x xE x
Therein: is the position of fired strip; is the amplitude of signal; is the position, calculated from centroid; xixia
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16 in 16Second central moment/Variance
-HV
1710
1750
Ar 75 80 85
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Near Future PlansFurther detailed test, such as :
Beam test at Jlab?A prototype for SoLID
Space resolution;VME DAQ (1024 channels-ordered) ;Simulation;Timing performance;Proportionality of signal;… …
GEM
Silicon strip
Cosmic raySource
~45cm~48cm
~20cm
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SummaryGEM-Detector prototype test has been started in Tsinghua; The performance of the tested prototype is consistent with literature report : 1),energy resolution is about 20%-30% for Fe55 depending notably on read-out strip parameters, insignificantly on gas-mixture or HV; 2), 2nd Moment of the signal distribution, increasing slightly with decreasing quenching gas, is larger for the 400um strip space configuration; Next step is to build a prototype for SoLID;
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Thanks!