GEM Fission IAC 11082013

Runlist

Run	Conditions
6588	Run GEM detector in Hall at V_gem= 2650 V_cath=2950 Shutter Open! Signal on ADC5 at about 1000 channels, CFD threshold at 84 mV, 10 Hz clock in scaler channel 5, rate was 7 Hz
6589	same as run 6588 except, V_gem = V_cath = 2650 and lowered CFD threshold to 64 mV because there were no triggers, rate was 2 kHz, noise was at 1000 channels as well, a lot of pileup but histogram seems representative of noise. increase GEM gain
6593	Run GEM detector in Hall at V_gem= 2700 V_cath=3150, CFD threshold at 88 mV, 10 Hz clock in scaler channel 5, rate was 27 Hz,
6594	V_gem= 2750 V_cath=3150, CFD threshold at 88 mV, 10 Hz clock in scaler channel 5, rate was 27 Hz,
6595	Shutter Closed now V_gem= 2750 V_cath=3150, CFD threshold at 88 mV, 10 Hz clock in scaler channel 5, rate was 27 Hz, 33 min 29 sec,
6596	Shutter Open now V_gem= 2800 V_cath=3100, CFD threshold at 88 mV, 10 Hz clock in scaler channel 5, rate was 31 Hz,
6597	Shutter Closed now V_gem= 2800 V_cath=3100, CFD threshold at 88 mV, 10 Hz clock in scaler channel 5, rate was 27 Hz,
6598	Decreased Post amp from x6 to x1 Shutter Closed V_gem= 2800 V_cath=3100, CFD threshold at 21 mV, 10 Hz clock in scaler channel 5, rate was 22 Hz,
6599	same as run 6598 V_gem= 2800 V_cath=2800, CFD threshold at 21 mV, rate was 79 Hz,
6600	Decreased Post amp from x6 to x1 Shutter Closed V_gem= 2800 V_cath=3100, CFD threshold at 15 mV, 10 Hz clock in scaler channel 5, rate was 79 Hz,
6601	Decreased Post amp from x6 to x1 Shutter Open V_gem= 2800 V_cath=3100, CFD threshold at 15 mV, 10 Hz clock in scaler channel 5, rate was 114 Hz,
6603	added attenuator, changed CFD post amp no longer differentiating signal, Shutter Closed V_gem= 2800 V_cath=3100, 10 Hz clock in scaler channel 5, rate was 114 Hz,

TGEMS#GEM_fission_chamber_tests