aLIGO LHO Logbook

H1 SUS (SEI, SUS)

joshua.freed@LIGO.ORG - posted 15:07, Thursday 19 December 2024 (81914)

SR3,SRM OSEM Noise Injections

J. Freed,

SRM M1 stage bosems (speciffically T2, T3) show strong coupling below 10Hz. SR3 M1 had some on LF, RT bosems between 10-15Hz

Today I did damping loop injections on all 6 BOSEMs on the SR3 and SRM M1. This is a continuation of the work done previously for ITMX, ITMY, PR2, PR3, PRM, SR2. As with PRM, gains of 300 and 600 were collected for SR3 (300 is labled as ln or L). Only a gain of 600 was collected for SRM due to time constraints. Calibration lines were on for SR3.

The plots, code, and flagged frequencies are located at /ligo/home/joshua.freed/bosem/SR3/scripts. While the diaggui files are at /ligo/home/joshua.freed/bosem/SR3/data for SR3. I used Sheila code located under /ligo/home/joshua.freed/bosem/SR2/scripts/osem_budgeting.py to produce the sum of all contributions as well as the individual plots.

SRM.png Shows SRM M1 bosems contribution to DARM at 600 amplitude on each bosems excitation channel. Only T2 and T3 seem to have a noticible effect.

SR3.png Shows SR3 M1 bosems contribution to DARM at 600 amplitude. Besides the bounce mode at 9Hz, SR3 only had some coupling from 10-15Hz on the LF and RT BOSEMs. Might have more behind the calibration lines

main.png Shows the current version of the sum of the BOSEM contributions. Only PR3, PRM, SR2, SR3, SRM are included so far.

Side note:

Screenshot_60Hz_background.png Shows SRM M1 T3 out channel is giving an unusual strong 60Hz signal during quiet time. All BOSEM on SRM were giving this signal. Unsure if this is a continuous issue. Unlikely to have affected this measurment but worth pointing out.

reference number in diaggui files for SR3

Background time: (ref0 DARM, ref1 LF_out, ref2 RT_out, ref3 SD_out, ref4 T1_out, ref5 T2_out, ref6 T3_out)
LFL time:                (ref7 DARM, ref8 LF_out)
LF time:                (ref9 DARM, ref10 LF_out)
RTL time:           (ref11 DARM, ref12 RT_out)
RT time:             (ref13 DARM, ref14 RT_out)
SDL time:      (ref15 DARM, ref16 SD_out)
SD time:          (ref17 DARM, ref18 SD_out)
T1L time:            (ref19 DARM, ref20 T1_out)
T1 time:            (ref21 DARM, ref22 T1_out)
T2L time:          (ref23 DARM, ref24 T2_out)
T2 time:                (ref25 DARM, ref26 T2_out)
T3L time:             (ref27 DARM, ref28 T3_out)
T3 time:             (ref29 DARM, ref30 T3_out)

reference number in diaggui files for SRM

Background time: (ref0 DARM, ref1 LF_out, ref2 RT_out, ref3 SD_out, ref4 T1_out, ref5 T2_out, ref6 T3_out)
LF time:                (ref7 DARM, ref8 LF_out)
RT time:             (ref9 DARM, ref10 RT_out)
SD time:          (ref11 DARM, ref12 SD_out)
T1 time:            (ref13 DARM, ref14 T1_out)
T2 time:                (ref15 DARM, ref16 T2_out)
T3 time:             (ref17 DARM, ref18 T3_out)

Images attached to this report