chandra.romel@LIGO.ORG - posted 14:13, Friday 10 January 2020 - last comment - 15:14, Thursday 30 January 2020(54409)
possible air leak at EX
While RGA manufacturer was on site testing Labview-based RGA software, we noticed a significant AMU 28 peak at EX, towering water signature, suggesting an air leak. The total pressure is 1.9e-9 Torr and the trend is relatively flat, so no urgent concern. I suspect this is due to the failed annulus ion pump on GV20. We may have an inner o-ring leak on GV20 in addition to diffusion through o-rings.
AIP has been off for over a week as EX has been inaccessable due to tumbleweed blockages.
EY scan is also attached for comparison.
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90 day pressure trends at EX and EY attached (log scale).
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There is a typo in file name of original alog entry. The file name with 1000 V should be EY (not EX).