camilla.compton@LIGO.ORG - posted 14:25, Friday 13 June 2025 - last comment - 11:24, Monday 16 June 2025(85022)
Bruco Ran
Yesterday we ran a bruco on Francisco's post-vent SQZ time from 84996. Link to bruco here.
Command used: python -m bruco --ifo=H1 --channel=GDS-CALIB_STRAIN_CLEAN --gpsb=1433758866 --length=600 --outfs=4096 --fres=0.1 --dir=/home/camilla.compton/public_html/brucos/1433758866 --top=100 --webtop=20 --plot=html --nproc=20 --xlim=7:2000 --excluded=/home/elenna.capote/bruco-excluded/lho_DARM_excluded.txt
Links to to a few coherences, although I haven't done a deep dive: SRCL (some 100-250Hz), PRCL, MICH (bad 2-4Hz), PSL ISS 2nd loop, can see the jitter peaks in IMC WFS
The high coherence with CHARD P is probably coming from excess noise in CHARD P from HAM1, 84863. Jim is set to do further HAM1 ISI tuning tomorrow, so we can recheck this coherence later. We also have plans to rerun the noise budget injections to check if the CHARD coupling has changed.
We could do an iterative feedforward to take care of the residual LSC coherence, which mainly seems to be coming from MICH LSC.
We should also determine how much the MICH ASC coherence is limiting DARM and maybe change the loop design again.
Much of the other coherence seems to be jitter.