Reports until 17:56, Wednesday 25 April 2012
H2 ISC
daniel.hoak@LIGO.ORG - posted 17:56, Wednesday 25 April 2012 (2699)
ALS table work (Alberto, Frank, Dan, Aidan on the phone)
We got the alignment of the ALS table, including the various Hartmann wavefront sensor paths, into an almost-final state.

We discovered that one of the lenses in the TCS pickoff from the returning ALS beam was converging instead of diverging.  This has been temporarily swapped for a correct, but 1064-coated, lens from the optics lab.  A lens coated for 532nm is on its way.  With a correctly-shaped lens in the path, the beam on the HWS is now about the right size.  (A quick beamscan made us think it's a little larger than it's supposed to be; we'll let experts wrestle with it at a later date.)

After considering the periscopes for quite a while, and thinking about drilling holes in various places, we decided the most elegant solution to the ALS/HWS periscope problem was to swap the vertical periscope mounts, so we would have more screw holes to work with.  This allows us to mount the ALS periscope baseplate as intended, and kludge a HWS beam periscope below that.  Pictures attached (from my iPhone - d'oh!).

Modulo some further tweaking, the table layout and alignment should now reflect D1100607-v7.
Images attached to this report