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| laser spectroscopy on Be-like Kr |
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Message ID: 37
Entry time: Thu Feb 27 10:52:32 2025
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| Author: |
Rodolfo |
| Category: |
Detectors |
| Subject: |
Taking PMTs into operation |
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PMT Nord the power supply (CH0) is giving an alarm already by an applied voltage of -1707 V (operation voltage is -2450 V). It is leaking to much current, larger than the set value of 310 uA. See attached picture 20250227_105411.jpg .
- 10:50 I am trying to identify the issue.
- 14:00 I increased the current limit Iset to 500 uA and the PMT was working OK by an applied voltage of -2500 V. After few minutes the HV power supply showed again an alarm. Afterwards the HV power supply CH0 is not giving any voltage anymore :-/
- 14:15 We Danyal and me, tried to get the PMT working using an alternative power supply. By a voltage of -2500 V the PMT does not show any signal.
- 16:50 I tested the HV power supply (CH0). It is working again.
Once the cave is opened, we will check this PMT in situ
PMT Mitte It is working fine by an applied voltage of -2450 V (current of 144.6 uA). See attached picture 20250227_143518.jpg. Its dark count rate is < 10 Hz by a threshold of -26 mV measured in the oscilloscope. |
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