Reports until 20:39, Thursday 09 August 2012
H2 ISC
bram.slagmolen@LIGO.ORG - posted 20:39, Thursday 09 August 2012 (3793)
OAT locked for the night.

The Arm is locked, as off 03:24:00 UTC (20:24h local time).

The various controls are in the state listed below.

Channel of interest is 'H2:ALS-Y_ARM_LONG_IN1_DQ' and has units of nm (and is sampled at 16k).

HPI State:

All running fine. The cavity feedback (off load) at low frequencies to HPI ETMY, with a UGF of ~1 mHz. ETMY_ISCINF_LONG has a a 250k nm limit on the output (I got an effective limit of 200k nm on the output of the signal ISC sends into the RFM).

ISI State:

Stage 1, (ITM/ETM) X/Y 250mHz blend other at 750mHz blend

Stage 2: (ITM/ETM) XY 100mHz other 750mHz blend.

Quad Sate:

ETM: M0 damping on, L1 L/P damping only, L2 no damping (watch dog off), L3 no damping

ITM: M0 damping on, L1 L/P damping only, L2 no damping (watch dog off), L3 no damping (watch dog off)

 

Attached is an initial spectrum .... the frequency noise has dropped nicely! (due to 3791)

Images attached to this report