Reports until 10:53, Tuesday 01 December 2015
H1 CDS (CDS, PEM)
keita.kawabe@LIGO.ORG - posted 10:53, Tuesday 01 December 2015 (23857)
CER temperature got slightly lower

After yesterday's report that CER temperature was high (alog 23826), Bubba made some adjustment of the diverter(???) for CER yesterday, which made the temperature go down by 0.5 C, and RF output level got somewhat higher.

The second attachment shows that the temperature jump on 27/Nov in CER (red vertical lines) didn't coinside with the time they made the adjustment to the air handler (blue vertical lines). Though we don't understand why the temperature went up at that timing, since no catastrophy was observed, and since the temperature seems to be well regulated, I guess we need to operate like this.

Note that the PEM temperature screen is reporting many out-of-tolerance errors including CER and Sup. It doesn't prevent us from going observation, but when we figure out that the current temperature is good, I think we'd better update eiither the tolerance or the nominal temperature.

Images attached to this report