Reports until 04:58, Tuesday 12 April 2016
H1 PSL (PSL)
peter.king@LIGO.ORG - posted 04:58, Tuesday 12 April 2016 (26540)
Frequency stabilisation status
The transfer function measurement of the frequency stabilisation servo are attached.
The unity gain frequency is ~180 kHz with a phase margin of ~25 degrees.  Recall that
because of the way the readout monitor ports are, the unity gain should read at -10dB.

The measured values are a little lower than what was measured with just the front end
laser running.  Although not too far off.

Not quite sure what the dip in the magnitude around 25.5 kHz is but it might be related
to the injection locking electronics.

The current gain slider settings are fast gain = 22 dB, common gain = 16 dB.  The output
of the RF photodiode is 50-60 mV locked, 230-320 mV unlocked.


Jason, Peter
Images attached to this report