edmond.merilh@LIGO.ORG - posted 10:55, Wednesday 17 April 2019 - last comment - 10:07, Friday 19 April 2019(48571)
FSS TPD changes vs Relative Humidity Changes
Maybe, there is some correlation between laser/diode room humidity levels and the FSS tpd movement?
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I've attached a 10-day minute trend and a 2-day minute trend. On the 2-day trend, it can be seen that the PSL enclosure humidity begins rising at ~15:00 UTC (8:00 PDT) yesterday, 4/18/2019, with no real change in the FSS TPD. Once the humidity gets to ~30%, the FSS RefCav TPD begins to decrease. Conversely, near the start of the 10-day trend it can be seen that the FSS RefCav TPD begins to increase once the enclosure humidity drops below ~30%. Also on the 10-day trend, while the humidity varies between 20% and 30% the FSS RefCav TPD appears to follow the changes, but with some delay. We're continuing to monitor this.
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