aLIGO LHO Logbook

H1 General

jeffrey.bartlett@LIGO.ORG - posted 23:03, Thursday 12 November 2015 - last comment - 23:27, Thursday 12 November 2015(23362)

Lockloss - Environmental

   Lockloss at 06:03 (22:02) – Probably due to high winds (in the high 20s to mid 30s with gusts over 40mph) and increasing microseism (centered at 0.8um/s with high at plus 1.0um/s). Attempting to relock. 

   The wind has dropped a bit, but microseism is increasing. Switched the ETM-X Y and ETM-Y X dof from Quite90 to 45mHz to see if this will help with locking. ETM ISI CPSs are not rung up.

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jeffrey.bartlett@LIGO.ORG - 23:27, Thursday 12 November 2015 (23363)

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   The wind has come back up and microseism has risen to be centered at 1.0um/s. Could rarely move past LOCKING_ALS and never past DRMI_1F. The ETM-X ST1 CPS had also started to ring up. 

   Put the IFO into DOWN to wait for conditions to improve. I returned the ETM-X and ETM-Y blends back to Jim's Odd Blends, and the ETM-X ST1 CPS quickly returned to a quite state. Will leave these set as they are.

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