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E0052_2025
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| Nuclear hyperfine mixing in 229Th89+ 2025 |
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Message ID: 4
Entry time: Wed Jun 4 16:18:57 2025
In reply to: 1
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| Author: |
Rodolfo, Simon |
| Category: |
Detectors |
| Subject: |
PMT dark count rates |
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I adjusted the offsets of the amplifiers in the cave and measured the dark count rates :
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PMT | Model | | Operation Voltage | Count rate (Hz)
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South | ET9422B | Broadband | -1500 V | 1300
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Middle | ET9423B | Smallband | -2650 V | 20
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North | ET9423B | Smallband | -2650 V | 30
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Also the MCP anode of the XUV detector is now connected to the amplifiers and fed to the data cable of "PMT Cu".
| Quote: | This is the arrangement of the photomultipiers at the optical detection region at ESR for Thorium 2025
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PMT | Model | SN | | Operation Voltage | Threshold
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South | ET9422B | 1042 | Broadband | -1500 V |
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Middle | ET9423B | 653 | Smallband | -2650 V | 10 (preliminary)
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North | ET9423B | 652 | Smallband | -2650 V | 12 (preliminary)
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