Kara Merfeld, T. Shaffer

To plan for DI.PROJ39 "Add alignment control and sensing system for vertex HWS", we needed to get the power of the ALS beams that make it onto the table. We locked the arms in green and then went on table with a power meter and measured before and after the top periscope mirror. Like LLO (LLOalog47455), we have a few other ghost beams that make it out of the viewport, but there is one that is clearly the brightest for each arm. The beam for the Y misses the top periscope mirror, so we were unable to get the power anywhere else, but it is very close to what we see at X.