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.
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OMC length loop
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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).
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I/Q dmod phase.
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The current demod phase of 110 deg give us a I/Q separation by two orders of magnitude. Good enough.
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This was tested by injecting a 10 Hz excitation in pzt2.
The attached is the measured open loop from this morning.