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Reports until 17:24, Monday 24 April 2023
H1 SQZ
naoki.aritomi@LIGO.ORG - posted 17:24, Monday 24 April 2023 - last comment - 12:50, Tuesday 25 April 2023(68962)
Bug of TTFSS autolock

Naoki, Camilla

We found that the TTFSS autolock did not work while the IMC was locked as shown in the attached ndscope and guardian log. The two cursors in the ndscope show when the SQZ MANAGER guardian checked the IMC. Although the IMC was locked, the SQZ MANAGER guardian thought that the IMC is not locked and kept waiting. We manually turned off the ramp and turned on the booster on the fast path and then TTFSS recovered. 

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camilla.compton@LIGO.ORG - 12:50, Tuesday 25 April 2023 (68996)

We think we fixed this in snv commit #25404. There was a small typo that stopped the fiber enable being toggled and made the guardian incorrectly report "IMC unlocked". IFO has not been in a state to test the fix yet. 

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