LIGO Document E1300676-v1

ECR - Extraction of PSL beam in HAM1 through central viewport

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E - Engineering documents
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The HIFO-Y test showed that it is beneficial to extract the ALS and PSL beams from HAM1 through the same top mirror of the periscope on ISCT1 in order to minimize the noise in the green beat note used to lock the arm cavity. This will reduce the relative frequency noise between the green and red beams which sense the arm cavity length, thus facilitating the interferometer lock acquisition process.

Relevant LHO log entry:

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Notes and Changes:
9/13/2013 approved by Valera Frolov, Peter Fritschel & Dennis Coyne
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