HM 2014

9/16/14

Condition of above results

Shutter is Open

Red is Cf-252 source ON Run 7724

Green is Cf-252 source OFF run 7726

HV_GEM= -2930 Volts HV_Cathode=-3400 Volts

Gas Flow rate = 0.1 ft^3/hr

Goal

Can the Cf-252 source ON signal be changed?

Change the Cathode voltage to try and turn off the signal when the source is on.

Result

Yes, when the cathode voltage decreased to -3200V, QDC histogram does not show a difference in in the collected charge as the shutter is open and the source is on, and when shutter is open without the source the source on it.

Neutron_TGEM_Detector_Abdel