While Corey and company were working on the TCS chiller this morning (30037), I took this opportunity to do a quick health-check on OMC with a single-bounce beam. So far things seem good.

• OMC length loop
  • Seems fine. With the nominal locking settings, the UGF was found to be around 6 Hz which is a factor of two higher than it had been in this past February (25605).
• I/Q dmod phase.
  • The current demod phase of 110 deg give us a I/Q separation by two orders of magnitude. Good enough.
  • This was tested by injecting a 10 Hz excitation in pzt2.

The attached is the measured open loop from this morning.