georgia.mansell@LIGO.ORG - posted 12:43, Wednesday 08 August 2018 (43328)
Beam dumps on corner Hartmann table periscope
Peter K, Georgia M
We installed anodised aluminium beam dumps behind the top mirrors of the X and Y periscopes on the corner station Hartmann table.
This dumps the ALS transmitted beam that passes through the frosted backs of the top mirrors.