1. Characterizations of GEM detector prototype
Rajendra Nath Patra3, Amit Nanda1, Sharmili Rudra4, P. Bhattacharya1, Sumanya Sekhar Sahoo1, S. Biswas1 ∗, B. Mohanty1, T. K. Nayak3,
P. K. Sahu2, S. Sahu2
1School of Physical Sciences, National Institute of Science Education and Research, Bhubaneswar , Odisha, India
2Institute of Physics, Sachivalaya Marg, P.O: Sainik School, Bhubaneswar , Odisha, India
3Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Kolkata , West Bengal, India
4Department of Applied Physics, CU, 92, APC Road, Kolkata , West Bengal, India
Summary
GEM related activities started at NISER-IoP
Materials for 5 triple GEM detectors are obtained from CERN
One 10 cm×10 cm GEM detector prototype is built
Variation of count rate is observed with flow rate
Relative gain is measured with applied voltage
Long term stability term is performed with Sr90 source for about 335 hours
No aging is observed after an accumulation charge of ~0.05 mC/cm2
Effect of gas flow rate on count rate

2. Long-term test Normalized |anode current| Vs. |Anode current| Vs. T/p
Long term stability test is done with Sr90 source (0.1 μCurie)
Gas: Ar/CO2 70/30
Constant applied voltage to the divider: V
Anode current is measured with and without source continuously
Temperature, pressure and relative humidity are measured continuously with time stamp
Measurement of anode current using 6485 Keithley picoammeter
|Anode current| Vs. T/p
Normalized |anode current| Vs.