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takafumi.ushiba - 13:17 Tuesday 03 November 2026 (37793) Print this report
ETMX MN OpLev glitches

During the initial alignment, we observed ETMX large motion, which causes lockloss of X arm.
As shown in fig1, MN TILT OpLev SUM signals are jumpping, so it is likely due to the OpLev glitches.

Since we will start RSE commissioning soon, this glitch issue should be fixed soon.

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takaaki.yokozawa - 8:04 Wednesday 04 November 2026 (37795) Print this report
I also checked the glitch in ETMX this morning.
Xarm lock can be kept 1 hour, but ETMX MN TILT glitch frequently happened and I confirmed TM P had large glitch.
We need to treat the oplev source ETMX MN TILT.
(But why only TILT happened?)
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takaaki.yokozawa - 9:15 Wednesday 04 November 2026 (37797) Print this report
During this check, I noticed that the RMS of ETMX MN TILT oplev signal was larger than ITMX one.
I checked spectrum and found 58.375 peak was larger.
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