rahul.kumar@LIGO.ORG - posted 13:59, Friday 16 January 2026 - last comment - 09:49, Wednesday 21 January 2026(88788)
HAM7 - ZM4 physically moved in Yaw
Sheila, Karmeng, Rahul
This morning we physically moved ZM4 (since the sliders were saturating the DAQ output) in YAW to better align it with ZM5 and ZM6. More details (including health check results) will be posted later.
ZM4 is now dogged down to its new position.
I ran a quick transfer functions on ZM4, a few things to note. The suspension is in air so I changed the Coil Driver state from 2 to 1 (reverted once I was done) as the wiki suggested, the ISI is also tripped but the damping was engaged on the suspension. We were also slightly shaking due to an 6.1 earthquake from near Japan.
The suspension is looking healthy.
/ligo/svncommon/SusSVN/sus/trunk/HXDS/H1/ZM4/SAGM1/Data/
2026-01-21_1700_H1SUSZM4_M1_WhiteNoise_L_0p01to50Hz.xml
2026-01-21_1700_H1SUSZM4_M1_WhiteNoise_P_0p01to50Hz.xml
2026-01-21_1700_H1SUSZM4_M1_WhiteNoise_Y_0p01to50Hz.xml