evan.hall@LIGO.ORG - posted 22:55, Wednesday 19 November 2014 - last comment - 01:46, Thursday 20 November 2014(15188)
Refcav alignment fixed
Sheila, Nic, Evan
The refcav power has steadily declined over the last 10 days. Tonight it got so low that the modecleaner could not maintain lock for longer than a few minutes.
Sheila and Nic have realigned the pointing to the refcav in order to recover the power.
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Sheila and Evan measured the FSS path AOM efficiency.
Power levels:
Before the AOM: 64mW
First pass through AOM: 52mW
Second pass: 38mW
First pass efficiency: 81%
Second pass efficiency: 73%
Total efficiency: 59%
here is a trend of the ref cav trans and PSL temperature, its not clear if temperature caused the problem.
This is sheila
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