Reports until 13:47, Wednesday 01 July 2026
H1 SUS (SUS)
rahul.kumar@LIGO.ORG - posted 13:47, Wednesday 01 July 2026 (90803)
In-air TF measurements taken for ITMX and ITMY (main and reaction chain) - looks healthy

Attached below are the screenshots of the transfer function measurements for ITMX and ITMY (main and reaction chain - all 6 dof.), I can confirm that they look healthy.

The templates are stored at the following location.

/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/SAGM0/Data

2026-06-29_2000_H1SUSITMX_M0_WhiteNoise_L_0p01to50Hz.xml
2026-06-29_2000_H1SUSITMX_M0_WhiteNoise_P_0p01to50Hz.xml
2026-06-29_2000_H1SUSITMX_M0_WhiteNoise_R_0p01to50Hz.xml
2026-06-29_2000_H1SUSITMX_M0_WhiteNoise_T_0p01to50Hz.xml
2026-06-29_2000_H1SUSITMX_M0_WhiteNoise_V_0p01to50Hz.xml
2026-06-29_2000_H1SUSITMX_M0_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/SAGR0/Data

2026-06-29_2100_H1SUSITMX_R0_WhiteNoise_L_0p01to50Hz.xml
2026-06-29_2100_H1SUSITMX_R0_WhiteNoise_P_0p01to50Hz.xml
2026-06-29_2100_H1SUSITMX_R0_WhiteNoise_R_0p01to50Hz.xml
2026-06-29_2100_H1SUSITMX_R0_WhiteNoise_T_0p01to50Hz.xml
2026-06-29_2100_H1SUSITMX_R0_WhiteNoise_V_0p01to50Hz.xml
2026-06-29_2100_H1SUSITMX_R0_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMY/SAGM0/Data

2026-06-30_1500_H1SUSITMY_M0_Mono_WhiteNoise_L_0p02to50Hz.xml
2026-06-30_1500_H1SUSITMY_M0_Mono_WhiteNoise_P_0p02to50Hz.xml
2026-06-30_1500_H1SUSITMY_M0_Mono_WhiteNoise_R_0p02to50Hz.xml
2026-06-30_1500_H1SUSITMY_M0_Mono_WhiteNoise_T_0p02to50Hz.xml
2026-06-30_1500_H1SUSITMY_M0_Mono_WhiteNoise_V_0p02to50Hz.xml
2026-06-30_1500_H1SUSITMY_M0_Mono_WhiteNoise_Y_0p02to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/SAGR0/Data

2026-06-30_2000_H1SUSITMY_R0_WhiteNoise_L_0p01to50Hz.xml
2026-06-30_2000_H1SUSITMY_R0_WhiteNoise_P_0p01to50Hz.xml
2026-06-30_2000_H1SUSITMY_R0_WhiteNoise_R_0p01to50Hz.xml
2026-06-30_2000_H1SUSITMY_R0_WhiteNoise_T_0p01to50Hz.xml
2026-06-30_2000_H1SUSITMY_R0_WhiteNoise_V_0p01to50Hz.xml
2026-06-30_2000_H1SUSITMY_R0_WhiteNoise_Y_0p01to50Hz.xml

Since the ISI is locked, we see some cross coupling and peaks around 7Hz on some dof. I discussed it with Jeff K and he said its okay to ignore it for now. I will take another measurements later when the ISI is floating and damped.  

The suspensions has been restored to ALIGNED state after the measurements were complete.

Non-image files attached to this report