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Reports until 16:44, Wednesday 03 December 2014
H1 SUS
betsy.weaver@LIGO.ORG - posted 16:44, Wednesday 03 December 2014 (15418)
HAM 5 info

Sheila was asking about extra glinting showing up in HAM5 somewhere between the SRM and SR3 suspensions which sit almost side-by-side when viewed face-on from HAM4.  I've dug through the log and have reposted below some HAM5 pics which confirm that

1) the SR3 HR baffle location and orientation look to match the L1 HAM5 position, and the specified mechanical layout drawings of HAM5 (phew)

lho log 12599 pic

2) the baffle does not appear to completely block the line-of-sight to the left edge of the SR3 suspension cage which appears to be light up

llo log 7180 HAM5 pic

 

I also confirmed that according to E1200145, the SRM, SR2, and SR3 optics all have a vertical wedge, so no secondary back reflections in the cavity should be propogating from the SR optics along the yaw axis.

 

Although she was specifically asking about light just to the left of the SR3 optic, there are light splashes above the optic on the SUS cage and below the optic on the HAM table, outside of the baffle frame.  It is difficult to see the right edge of the baffle and cage with the existing camera view.  I supect this is just the low power, non-gaussian tail of the beam which the cameras are very sensitive to.  Will have to watch to see if this correlates to anything bad the commissioners see twitching around in the cameras.

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