LIGO Document G1800345-v1

ITM03 LHO ITMx post O2 inspection - LVC Presentation

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The Hanford ITMx was removed after O2 due to a high absorption spot. The optic had been examined and cleaned in-chamber, May 2017. The absorption persisted.

A feature was found at the location predicted by TCS. This feature is highly absorbing. A feature at this location was present in the scatter scans of the optic as received from the coater. Several other post-coating absorbers over 20 ppm were found in the center 60 mm of the optic.

LIGO-E1000766: ITM03 Characterization
LIGO-T1700193: ITM03 inspection at LHO and investigation of circular features

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