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Entry  Fri Sep 20 11:39:04 2019, gautam, Update, Optical Levers, ETMX Oplev HeNe Dead ETMX_OLdead.png
    Reply  Sun Sep 29 16:08:25 2019, gautam, Update, Optical Levers, ETMX Oplev HeNe replaced OLRIN_20190929.pdf
Message ID: 14902     Entry time: Fri Sep 20 11:39:04 2019     Reply to this: 14911
Author: gautam 
Type: Update 
Category: Optical Levers 
Subject: ETMX Oplev HeNe Dead 

While working on recovering interferometer alignment, I noticed that the ETMX Oplev SUM channel reported 0 counts. Attachment #1 shows the 200 day trend - despite the missing data, the accelerating downward decay is evident. I confirmed that there is no light coming out of the HeNe by walking down to EX. The label on the HeNe says it was installed in March 2017, so the lifetime was ~30 months. Seems a little short? I may replace this later today.

Attachment 1: ETMX_OLdead.png  29 kB  Uploaded Fri Sep 20 12:42:18 2019  | Hide | Hide all
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