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PEM (Center)
takaaki.yokozawa - 10:39 Monday 20 March 2023 (24467) Print this report
Vacuum monitor unstable again
The unstable readout of vacuum monitor became unstable again (Maybe after the ion pump work last Friday)
(BS and EXC and TMSX)
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takaaki.yokozawa - 6:54 Thursday 23 March 2023 (24503) Print this report
STILL UNSOLVED.
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takaaki.yokozawa - 12:06 Thursday 23 March 2023 (24510) Print this report
And the vacuum level of EXC gradually up in current two days, we need to see the vacuum level carefully.
nobuhiro.kimura - 14:58 Friday 24 March 2023 (24531) Print this report

Attached are graphs of residual gas measurements for IXC and EXC.
The pressure gauge nearest the cryostat is a Q-mass attached to the cryostat.
The tendency of fluctuation of the total pressure is small, and I consider it to be within the margin of error.

I assume that the pressure fluctuation in EXA (EXC?) is due to the effect of stopping the vacuum pump system of EXT.

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nobuhiro.kimura - 8:21 Wednesday 29 March 2023 (24581) Print this report

Attached are five plots of the change in residual gas components for inner pressure of BS, IXC, IYC, EXC and EYC from December 1, 2022 to March 29, 2023.
The effect of the TMPs shutdown on March 27, 2023 are small, and no tand of rapid increase in "Total Pressure (Pa)" have been observed.

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