Displaying report 1-1 of 1.
Reports until 10:26, Monday 25 August 2025
H1 ISC
sheila.dwyer@LIGO.ORG - posted 10:26, Monday 25 August 2025 (86545)
A2L script ran, is decoupling well

It has been a while since we ran our A2l decoupling script, so I ran it this morning.  I also took before and after tranfer funstion measurements for the HARD loops to DARM, the script did improve things overall.  The templates used for these measuerments are in userapps/asc/h1/templates/CHARD and DHARD.  I've loaded these changes into ISC lock.  I had planned to check if it is possible to do better than the script by adjusting ITMs in common and differential by hand, but based on these measurements that doesn't seem worth doing, as the only one close to DARM around 20 Hz is CAHRD P where the decoupling looks quite good at 20 Hz

Optic   DOF    Initial  Final  Diff
ETMX   P         3.18   3.07 -0.11
ETMX   Y         4.89   4.79 -0.1
ETMY   P         5.53   5.54  0.01
ETMY   Y         1.33   1.42  0.09
ITMX   P        -0.53  -0.45  0.08
ITMX   Y         3.25   3.16 -0.09
ITMY   P         0.08   0.19  0.11
ITMY   Y        -2.82  -2.75  0.07
Images attached to this report
Displaying report 1-1 of 1.