Reports until 12:28, Sunday 24 March 2019
H1 SQZ
daniel.sigg@LIGO.ORG - posted 12:28, Sunday 24 March 2019 - last comment - 13:12, Sunday 24 March 2019(47820)
Squeezer Issues

Issue 1: The polarization from the PSL fiber has changed which results in too much power on the broadband PD used for the squeezer beat note. At too much power this PD saturates and squashes the beat note which was found at -14dBm (should be -1dBm). The SQZ-FIBER _TRANS_PD_POWER should be between 10 and 30µW. New limits have been set. If the laser locking complains with the error message "Fiber Trans PD Error", the waveplates  names "SQZ PSL FIBR HWP/QWP/HWP" should be adjusted to bring the normalized power back to 1, or roughly 20µW.

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nutsinee.kijbunchoo@LIGO.ORG - 13:12, Sunday 24 March 2019 (47822)

Attached a screenshot of where you will find this error.

In the future if people encounter squeezer locking issue please attached following screenshots to the alog so we have a glimpse of what's going on. The main SQZ screen can be access via SITEMAP >> SQZ Overview

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