After much of the day was spent for recovery from maintenance, we wanted to make green WFS wider band, for which we need to redo penultimate mass to final mass pit to pit and yaw to yaw measurement, and since we're using OLs, and since OL whitening were bad but are now good, and since ISI is performing much better than the beginning of the HIFO_X, we decided to calibrate OL using baffle PDs again. And since we might want to use TMS for alignment we also did the calibration measurement for TMS.
We only had time for TMS and ITMX for today.
TMS:
Used H1:AOS-ITMX_BAFFLEPD_1_POWER and 3_POWER (3 is actually connected to PD4). Also recorded H1:SUS-ETMX_M0_DAMP_P_IN1 and H1:SUS-ETMX_M0_DAMP_Y_IN1 and used tdsavg.
"delta claimed" is the TMS rotation measured as the difference of bias offsets between PD4 and PD1, "delta physical" is derived from baffle diode drawing and the arm length of 4000m (see the drawing in this alog: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=9087).
Positive PIT means the beam points down. Positive YAW means the beam rotates counter-clockwise viewed from the top.
| ITMX baffle PD1 | ITMX baffle PD4 (channel name is PD3) | delta claimed | delta physical | correction factor | |
| TMS bias slider (P, Y) | (203.3, -228.1) | (272.7, -289.7) | (69.4, -61) | (71.8, -72.0) | (1.035, 1.180) |
| TMS BOSEMs | (286.46 470.24) | (396.13, 415.91) | (109.67, -54.33) | (71.8, -72.0) | (0.654, 1.325) |
| power on baffle PD (mW) | 0.22 | 0.24 |
ITMX:
Used H1:AOS-ETMX_BAFFLEPD_1_POWER and H1:AOS-ETMX_BAFFLEPD_4_POWER. Also recorded H1:SUS-ITMX_L3_OPLEV_PIT_OUT and H1:SUS-ITMX_L3_OPLEV_YAW_OUT.
"delta reality" is half the angle formed by PD4, ETM and PD1 as the beam rotates twice the angle of the ETM.
Positive PIT means that the optic points down. Positive YAW means the beam rotates counter-clockwise viewed from the top. OL has different sign convention from SUS for PIT here.
| ETMX baffle PD1 | ETMX baffle PD4 | delta claimed | delta reality | Correction factor | |
| ITM bias slider (P, Y) | (34.6, -74.9) | (66.9, -42.2) | (32.3, 32.7) | (37.34, 37.37) | (1.156, 1.143) |
| ITM OLs | (8.643, -3.20) | (-11.115, 14.845) | (-17.94, 16.34) | (37.34, 37.37) | (-2.081, 2.287) |
| ITM top BOSEMs | (246.65, -386.038) | (349.14, -358.02) | (102.49, 28.02) | ||
| PM BOSEMs | (-2736.5, 193.8) | (-2709.41, 224.14) | (27.09, 30.34) | ||
| power on baffle PD (mW) | 0.65 | 0.65 |
Didn't have time to do ETMX.
ETM OL calibration was done using red beam while red team was doing red things.
Unlike ITMX, the OL PIT sign convention of ETMX is consistent with SUS convention, but OL YAW convention is inconsistent.
Also, unlike ITMX, ETMX OL amplitude doesn't seem to have a factor of 2 error.
Sign convention of SUS is: Positive P = pointing down. Positive Y = counter clockwise viewed from the top.