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Reports until 11:28, Wednesday 14 December 2011
H2 SUS
angus.bell@LIGO.ORG - posted 11:28, Wednesday 14 December 2011 (1910)
ETMY monolithic mode measurements
The modal frequencies of the ETMY monolithic section were measured yesterday.
	frequency (Hz)	     uncertainty
Longitudinal	0.651	     0.002
Pitch	        1.101	     0.002
Yaw	        1.092	     0.002
Vertical	6.72	        0.03
Roll (?)	9.66	        0.1

Fibre HR right	508.6	
fibre HR left	513.7	
fibre AR right	508.4	
fibre AR left	512.5	

The pitch and yaw modes are very close together. The feature at 9.7 Hz was guessed to be the roll mode. The violin mode measurement did not give a response as clear as normal but there are sharp features at the expected frequency and they make some sense in that the differential tension would indicate about 1/2 a mrad of excess pitch and we see 1 mrad 
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