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MUST2
SAMURAI_2018
S3-LEB-LPC
SUPERNEMO
MUGAST
EXPAND
SCALP
GALATRON
HiCARI
VELO
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| MUGAST |
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 Wed Feb 12 09:32:17 2020, mugast, TEST, RUN, General, Fixed, 3-alpha, Run 500 - 3alpha - mugast standalone 
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 Fri Feb 14 10:49:22 2020, Marlène & Franco, TEST, RUN, General, Fixed, 3-alpha, MG11 issues
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Message ID: 5564
Entry time: Fri Feb 14 10:49:22 2020
In reply to: 5561
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| Author: |
Marlène & Franco |
| ExpNbr: |
TEST |
| Type: |
RUN |
| Category: |
General |
| Status: |
Fixed |
| Target-Source: |
3-alpha |
| Subject: |
MG11 issues |
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We analyzed the behaviour of the annular. We realized that the 4-peaks behaviour on X was already present last year but only on one sector, now it's on two sectors. We noticed that there is a correlation between the malfunctioning sectors and the missing strips on Y. Last year there was only a missing strip on Y, affecting only one sector on X; now 3 strips are missing on Y, affecting 2 sectors on X. We believe that the fact that the boundings are missing have an impact on the grounding, therefore the sectors are not always biased properly, resulting in an oscillation of the pedestal. We estimate that this will cause a loss of efficiency of ~25% for the annular (from ~90% to ~67%).
| mugast wrote: | RUN 500
start: 11/02/2020 @ 19h00
stop: 12/02/2020 @ 10h00
alpha source test - cooling 14°C
Remarks:
- The two new detectors (MG2 and 6) seem functional;
- MG11 annular, ok for sectors (Y) but many rings have double peaks;
- MM1 current was oscillating yesterday evening with values around 3 uA, this morning it was stable at ~0.55 uA. |
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