Gain Adjustments

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Gains for each PMT/base combination to be used for the beamtest have been tested. Our method was to place two triggers on top of each other, and count the coincidence rate of cosmic rays as we vary the HV on the trigger we want to test. The other trigger was kept at 1700 V. Below are plots for the gain adjustments. There are 10 trigger scintillators, and 1 remote trigger.

The gains were fit with a "turnon function", the same we use for the PMT tests, and the central value of the turnon curve (V0) was obtained. The nominal HV values for each PMT/base combination is V0+100 [V].

Figure of Gains

  • Triggers:

  • Remote Trigger:
remote trigger

Table of Gains


position base ID V0 V0+100
H1 0x732c79 1421.96 1521.96
H2 0x72c932 1413.45 1513.45
H3 0x72360e 1446.51 1546.51
H4 0x738545 1493.05 1593.05
H5 0x733d10 1483.08 1583.08
V1 0x733e06 1451.23 1551.23
V2 0x72dacc 1477.14 1577.14
V3 0x72bb3f 1365.49 1465.49
V4 0x72579b 1442.73 1542.73
V5 0x738516 1436.49 1536.49
remote 1489.09 1589.09

main detector

These values were measured with the PMT tester, so there should be a strong correlation between the numbers shown here and the set HV, but they are not exactly the same.

position base ID PMT ID V0 V0+100
row 1 column 1 (bottom left) 0x72e92e 01583 1452.22 1552.22