aLIGO LHO Logbook

H1 PSL

peter.king@LIGO.ORG - posted 05:54, Wednesday 13 April 2016 - last comment - 06:08, Wednesday 13 April 2016(26561)

Changed FSS Autolocker settings

As a test I changed the FSS autolocker settings.

MIN [K] from -0.2000 to -0.0150
MAX [K] from 0.0000 to 0.0100

A fringe occurred when the NPRO crystal temperature was somewhere between -0.0130 and -0.0140.
I reduced the autolocker temperature search ramp range so that hopefully the autolocker won't
spend so much time hunting for the fringe.  Engaging the autolocker did not knock the FSS out
of lock.

It might be that over time the NPRO crystal temperature will exceed -0.0150, in which case the
autolocker settings may need to be changed.

Comments related to this report

peter.king@LIGO.ORG - 06:08, Wednesday 13 April 2016 (26562)

Link

Attached is a plot of the NPRO crystal temperature for when the FSS was locked.  So it might be that the
minimum temperature can be set to -0.035 in case the autolocker cannot find the fringe with the current
(ie modified) settings.

/* standard disclaimer */
Past performance is not an indicator of future results.

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