Reports until 10:15, Thursday 13 December 2018
H1 SQZ (SQZ)
nutsinee.kijbunchoo@LIGO.ORG - posted 10:15, Thursday 13 December 2018 (45903)
SQZ pump transmission to SQZT6 dropped to ~20%

In alog45288 we measured 44% transmission from ISCT6 fiber coupler into chamber. Attached a plot showing transmission dropped over two days from Nov 30 to Dec 2. SHG launch shows somewhat constant power going into the fiber coupler while OPO REFL dropped 40% to 23%. Also attached another plot over 20 days. Terry also recovered ISCT alignment so we now have 83% transmission to the end of 5m fiber (alog45871). We've never recovered 40% level of transmission.

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