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takaaki.yokozawa - 9:09 Thursday 16 June 2022 (21153) Print this report
ITMX MN oplev glitch investigation (Temperature change)
Unfortunately(Fortunately??) because the IY cooler was stopped during last weekend, the temperature of center are changed, so I checked the ITMX MN oplev noise with changing the temperature.
Fig.1. showed the 10 days trend of oplev SUM and temperature.
As you can see, the glitch is continuously appeared with this temperature change.
Fig.2. showed the expanded graph, if there are gradient of the temperature, the glitch became smaller? but I couldn't judge.
Fig.3. showed the effect of oscillation, from this figure, some instrument ON/OFF affect to small temperature change and QPD SUM?
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