Reports until 13:34, Saturday 06 June 2026
LHO General (SEI)
alexandra.mitchell@LIGO.ORG - posted 13:34, Saturday 06 June 2026 (90519)
HAM3 CRS assembly complete
Friday June 5th we completed the assembly for the CRS that is going in HAM3. 

First thing we checked the alignment of the HoQIs, Fringe visibility: SN005 86% SN007 85%

We swapped out the photodiodes and cables in SN007 due to damage in one of the cables which meant the wire was exposed risking grounding issues should this touch any of the metal parts. The fringe visibility after this was at 72%. 

The HoQIs were completed with the baffles and top cover. SN007 cover is incorrect and the correct parts were not out of C&B so the wrong cover is on it at the moment this will be switched when we have the clean part. 

They were fixed to the CRS and aligned to it. SN007 is on the right and SN005 is on the left. Fringe visibility with the CRS fixed was as follows
SN007 sin 82% cos 80% mcos 82% SN 005 sin 83% cos 75% mcos 83%
The CRS was released and the fringe visibility for both left and right was checked, they were >80%, not all PDs were recorded but eg SN007 mcos was 82%