gabriele.vajente@LIGO.ORG - posted 13:08, Thursday 10 November 2016 - last comment - 14:06, Thursday 10 November 2016(31394)
BruCo scan
Here's the report of a BruCo scan for last night's lock
https://ldas-jobs.ligo.caltech.edu/~gabriele.vajente/bruco_lho_1162821617/
Some interesting results:
-
in the 10-20 Hz region there is coherence with
- WFS signals (ASC-REFL_A_RF9_I_PIT, fig. 1),
- ASC signals (ASC-CHARD_P_OUT, fig. 3, ASC-MICH_Y, fig. 5, ASC-CHARD_Y_OUT, fig. 6, some CSOFT too, fig. 7)
- but more interesting with HPI signals (for example HPI-HAM1_SCSUM_IPS_IN_Z, but others too, fig. 2)
- and with RM signals (SUS-RM2_M1_OSEMINF_UR_OUT fig. 4)
- at 70 Hz PEM-EX_MAG_EBAY_SUSRACK_Z
- not much between 40 and 120 Hz
- usual jitter peaks above 100 Hz (fig. 8 for an example, lot of coherence with IMC WFS too), coherence well visible in the IMC MCL signals ad ISS signals too
A question for commissioners, should I exclude channels like SUS-ETMY_L2_FASTIMON_* ??
_FASTIMON
Images attached to this report
Comments related to this report
Correlation between HPI-HAM1 and the REFL mirror RM2 has been seen before - See series of logs on Oct 24. https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=30790 Note that HPI-HAM1 is different than all the other HPI-HAMs (2-6) because HAM1 is the only chamber without an ISI.