GEM progress from Chinese collaboration Yuxiang Zhao University of Science and Technology of China Aug 20, 2013 1.

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Presentation transcript:

GEM progress from Chinese collaboration Yuxiang Zhao University of Science and Technology of China Aug 20,

News from Chinese collaboration list is set up – – Monthly phone meeting will be held later every Wednesday in the last week of each month 8:30am-10:30am(US time) A new faculty is on board at USTC – Jianbei Liu ( Shandong University shows their interest in GEM R&D 2

3 Updates from Yi Zhou

Foil assembling by using NS2 technology(30cmx30cm) 4

Air-tightness test Gas in Also gas in No bubbles in both tubes  Air-tightness is good 5

HV discharge problem & solution Etching it out and then Seal the divider with glue 6

First signal for the 30cmx30cm Chamber 7

Energy resolution test(MCA, 8keV X-ray) Energy resolution is defined as: FWHM/Peak_location 8kev Peak~25% NOTE: First data taking without good calibration 8

Uniformity test by looking at energy resolution Energy resolution for 8KeV X-ray NOTE: First data taking without good calibration 9

To to list A new set of 30cmX30cm foil is ordered from CERN System calibration for the gain measurement Set up a cleaning system for GEM foil – See next page 10

Ultrasonic bath for detector clean 11

12 Updates from Xiaomei Li

GEM foil R&D Doing lamination and exposure of dry film photoresist, copper etching to get the optimized working condition Order a kapton etching machine, and will do the kapton etching in the next few months 13

14 Updates from Zhigang Xiao

Foil stretching(40cmX50cm) IMP 15

Readout board design ~ um Rate and multiplicity is lower in lab test So we use strip readout 16

New electronics CASAGEM Charge Amplifier and Shaping Amplifier for GEM Function: 16 channels for each, Amplification + Shaping Developed by Prof. Zhi Deng from the Dept. Engin. Phys., THU 17

CASAGEM Parameters Gain2~40mV/fC Dynamic Range0~1000fC Shaping time20~80ns INL<1% Power10mW/ch (Anode channel), 11mW/ch (Cathode channel ) ENC<2000e (Anode channel, Input Cap: 50pF), <3000e (Cathode channel, Input Cap: 100pF) 18

Near Future Work I Ensure that the CASAGEM is working properly with GEM detector Next: study inter foil distance effect For large foil, the inter-foil distance is hard to be completely homogeneous, particularly when it is running with high current in B field Cathode GEM1 GEM2 Anode/Readout strip d1 d2 -HV Make d2>d1 to see the effect. 19

Near Future Work II  To see first correct signals  What is the performance in cosmic ray test?  What is the performance in beam test?  What is the performance in a perpendicular B field? When the large GEM detector is ready: 20