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MUST2
SAMURAI_2018
S3-LEB-LPC
SUPERNEMO
MUGAST
EXPAND
SCALP
GALATRON
HiCARI
VELO
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Message ID: 865
Entry time: Tue Jul 10 07:16:16 2018
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| Author: |
Shumpei, Valérie |
| ExpNbr: |
e738 |
| Type: |
RUN |
| Category: |
General |
| Status: |
Fixed |
| Target-Source: |
Cryo-LH2 |
| Subject: |
RUN 326 |
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Run 326 start: 6h59
Beam: 9C
All Triggers: T1 to T8, CATS1% CATS2% PLASTIC%
Divisions: CATS1, CATS2 3. 10**4 ; Plastic% 10**4
Dead time between 8 and 15%
CATS2 X19 strip not running since Run 322
Total beam I 1.3 to 1.5 10**5 pps in CATS1, CATS2.
CATS2 700V 0.14 ľA.
I ~ 1.8uA to 2.0 ľA primary beam
We asked PCP to reduce to 1.7 ľA in order to avoid CATS1 tripping.
But CATS1 is continuously tripping even when we decrease the HV from 670 V to 660V then to 650V.
2 minutes ok see scalers at 7h18.
At 7h20 we try CATS1 HV 640V. Tripping.
At 8h02 we try again to put ON HV on CATS1. 640V ok, with I ~ 0.04 ľA (low value) for beam around 10**5 on CATS2.
It is running... (see un326_BeamTracksAt8h09.png )
With low efficiency, but at least we can check the beam trajectories. See Run326_BeamTracksAt8h09.png
Trip at 8h13. |
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