PePPO NaI PositronDetector 4 JLab

Detector setup for a NaI positron detector for PePPO

NaI detector

The PMT is powered by a HV supply which should have a DC ripple less than 200 mV peak-to-peak at 3kV/3mA. A DC ripple will change the gain of the PMT and cause the energy resolution to deteriorate.

The Linearity of the detector system is another way to reduce the energy resolution. The measured PMT output should be linear with the input signal when the gain is constant. This linearity can be measured using 2 radiation sources.

Input HV: +1085 V Input Current: 2.362 mA

Readout

F250

JLab's F250 flash ADC will be used to measure the NaI output

Na-22 source tests

Positrons#Experiments