Took some health check transfer functions for the BBSS in vacuum for the first time. I took a set with damping ON and then a set with damping OFF. These measurements were taken in HEALTH_CHECK, but with the opticalign sliders back on and damping settings appropriate for the measurement type. There was no difference in the measurements when the offsets were on vs off so I just left them on.

In-Chamber in-air vs in-vacuum with Damping OFF vs ON comparison:
/ligo/svncommon/SusSVN/sus/trunk/BBSS/Common/Results/allbbss_20260720_BBSS_InVac_DampingONvsOFF/allbbsss_20260720_BBSS_InVac_DampingONvsOFF_ALL_TFs.pdf
r13071

DAMP OFF

Matches with the last measurement we took in-air on July 6th (90925).

Settings
- BS in HEALTH_CHECK but with:
    - OPTICALIGN OFFSETS ON (they don't make a difference with these TFs)
- HEPI and ISI are in their nominal ISOLATED states (ISI no ST2 boost)

Data
/ligo/svncommon/SusSVN/sus/trunk/BBSS/H1/BS/SAGM1/Data/2026-07-20_2100_tfs/2026-07-20_2100_H1SUSBS_M1_WhiteNoise_{L,T,V,R,P,Y}_0p02to50Hz.xml
r13070
Results
/ligo/svncommon/SusSVN/sus/trunk/BBSS/H1/BS/SAGM1/Results/2026-07-20_2100_tfs/2026-07-20_2100_H1SUSBS_M1_ALL_TFs.pdf
r13070

DAMP ON

Damping is working pretty well for most peaks, but there are a few peaks that end up shifting quite a bit - most noteably the highest Pitch peak shifts from 2.1 Hz to 2.6 Hz.

Settings
- BS in HEALTH_CHECK but with:
    - DAMP ON
    - OPTICALIGN OFFSETS ON (although they don't make a difference with these TFs)
- HEPI and ISI are in their nominal ISOLATED states (ISI no ST2 boost)

Data
/ligo/svncommon/SusSVN/sus/trunk/BBSS/H1/BS/SAGM1/Data/2026-07-20_1800_tfs/2026-07-20_1800_H1SUSBS_M1_WhiteNoise_{L,T,V,R,P,Y}_0p02to50Hz.xml
r13068
Results
/ligo/svncommon/SusSVN/sus/trunk/BBSS/H1/BS/SAGM1/Results/2026-07-20_1800_tfs/2026-07-20_1800_H1SUSBS_M1_ALL_TFs.pdf
r13069