Aidan. Greg.

We removed the yellow viewport covers on HAM4 by the Hartmann sensor table (the acrylic covers are still in place). As expected, there was a leakage of the green ALS-X beam coming out of the HWSX and HWSY viewports (the HWSY green beam comes from the reflection of the ALS-X beam from the 50/50 surface of the beamsplitter, the HWSX green beam from the reflection of the ALS-X beam from the AR surface of the BS). The beams are incident on the apertures in the HWS table.

The beams are not centered on the apertures. However, due to the proximity of the HWS table to the H1-TCS-R1 rack (there's about 3"  and a lot of cables between them), and due to adequate clearance of the green beams (~2") from the edge of the apertures, I elected not to move the table any closer to the rack to center the beams more than they already are.

HWSX:

HWSY: