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PEM (Center)
takaaki.yokozawa - 14:54 Tuesday 24 December 2019 (12283) Print this report
Turned off the FFU about 1hour

This is just a memo.

The oplev signal trend when we turned off the FFU for about 1hour.

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tomotada.akutsu - 16:56 Tuesday 24 December 2019 (12287) Print this report

About SR3's oplev signals, it would be nice to check if the local sensors for IPs (such as geophones or LVDTs?) as well, as they might be sensitive to the temperature change. And also their legs are on the outer frame, which might be also deform due to the temperature change; actually the outer frame is also the base for the oplev QPDs, but as the light-source side is just fixed to the base of the outer frame, it might not be more sensitive than the other components.

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