Reports until 10:07, Tuesday 21 August 2018
H1 SQZ (SQZ)
nutsinee.kijbunchoo@LIGO.ORG - posted 10:07, Tuesday 21 August 2018 (43557)
Set up for a single bounce test

seed/pump Co-resonance temperature set to 41 C. Double checked with seed transmission scan using the homodyne. The manual flipper weren't flipped up before LVEA went laser safe so we have no camera to look at the transmitted seed beam.

Pump laser has to be taken off PSL due to an on-going work that would trip off the laser locking constantly. Cranked up OPO common path gain to 0 to tighten the loop a bit. This left us with 13 deg phase margin. So much for that idea. High peak around UGF. Back to -18dB as usual.

I also went out and unplugged the fast PZT output from TTFSS as it produces 232 Hz harmonics when TTFSS is not locked so the PZT doesn't get overdriven. Forgot to post an alog about this investigation.

Seed fluctuates a lot. At least 40% fluctuation or so.

Images attached to this report