LIGO Document E1400060-v2

ITM03 and ITM11 coating defect analysis

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E - Engineering documents
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ITM03 and ITM11 have roughly 50 and 30 coating defects respectively, counted over the entire surface. These defects were not spotted at LMA because they elected to not perform the micromap measurement before shipment to LIGO. The visual inspection by LIGO finds 2 defects in the center 50 mm of ITM11 and 3 defects in the center 50 mm of ITM03. Analysis shows that these defects should not cause loss in excess of our budget due to the small height.
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