[Thomas, Aidan]

Thomas and I tracked the source of clipping on the Hartmann sensor beam. The return beam from the ETM was hitting the edge of one of the mirrors in the back corner of the ALS table (see attached diagram). We tweaked the alignment so that the beam was centered on that optic.

The new beam profile on the HWS is attached. There is no sign of clipping now, but the beam quality is a poor Gaussian. There also appears to be horizontal fringes on the beam.