[Matthew, Camilla, Sheila]

ALS was having trouble locking X, so in light of us moving around spots on PR2 and pitching PR3, Sheila tried pitching PR3 up temporarily to see if that helped (it did). Instead of leaving that we went out to ISCT1 and added two thin shims to the DCPD post, and this returned the signal to previous values.

Attached are photos of the shims on the DCPD post.

We are missing the beam-dump a little on reflection of the DCPD, but it's low power so we may be able to ignore it...if we see excess scatter for some reason we can check.