Threshold & HV study

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Overview

A series of triggered CF-252 runs are conducted at various detector PMT high voltages and discriminator thresholds. A TDC spectrum is acquired using daq2 so that a neutron cut can be applied. These data provides us with a relationship between neutron detection rate and PMT HV/threshold.

Setup

A CF-252 source and trigger scintillation is placed at the geometric center of the neutron detector array.

results

Detector [math]n_{0}[/math] rate noise run # PMT
threshold
HV
D30 ? ?? r5242 25 1700
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5239 30
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5240 35
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5241 40
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5243 25 1650
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5244 30
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5245 35
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5246 40
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5247 25 1600
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5248 30
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5249 35
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5250 40
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5251 25 1550
D90 ? ??
D150 ? ??
D225 ? ??
D30 ? ?? r5252 30
D90 ? ??
D150 ? ??
D225 ? ??