LIGO Document E1300930-v1
- This document summarizes the tests done to validate the HEPI L1 ITMY (BSC1) assembly. As all L1 HEPI BSC, it had been installed since 2004 at Livingston. However, it had been grounded for the 2 to 3 years of aLIGO install. All electronics has been updated since, and more importantly, the position of the ITMY support tubes (i.e. the position of the 4 HEPI ITMY boots), but not the one of the housings, were adjusted to accommodate the position needed for aLIGO alignment. Note that when HEPI was first released, we subsequently found out that there was some constant rubbing between the boot and the housing, due to some of the moves done for Initial Alignment. The boot assembly was adjusted to provide clearanceThose adjustments were completed in July 2013.
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