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MUST2
SAMURAI_2018
S3-LEB-LPC
SUPERNEMO
MUGAST
EXPAND
SCALP
GALATRON
HiCARI
VELO
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Message ID: 5956
Entry time: Thu Feb 4 18:16:47 2021
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| Author: |
Franco |
| ExpNbr: |
TEST |
| Type: |
GRIT |
| Category: |
Hardware |
| Status: |
Fixed |
| Target-Source: |
3-alpha |
| Subject: |
Problems with the annular persist |
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We opened the chamber to verify the connections of the kaptons but they were all well connected. We checked with the tester the conductivity of the kapton YA5 and it was fine so we excluded any problem related to the kapton. The boards are working properly (the pulser is well seen). We have to conclude that the problem comes from the detector. We made another alpha source run and indeed the result is the same as yesterday -> 5 sectors working on Y. We also tried to rise the HV of the annular up to 95V instead of the nominal 80V: the current went to 19 uA but no new sector appeared in the spectra.
Apart from the usual spectra, attached are also the pedestals of MG11, the alpha spectrum for ch48 of MG11_Y (one of the working sectors). The HV were the same as yesterday. |
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