Jenne, Sheila, Thomas

We went back into HAM6 this afternoon after the PSL came back and we convinced ourselves that we couldn't find the beam on the OMC QPDs.  

• When we got back in the chamber, we placed the fast shutter in the beam and saw that we had less clearance between the beam from HAM5 and teh shutter structure than we expected (it was less than 1 cm of clearance.)  
• We decided to move OM2 1 cm in the -X direction, to give us a little better clearance on fast shutter structure, we then rotated OM1 to center on OM2.  
• We moved OM3 about 1 cm closer to the OMC along the narrow direction of the cage (translation of the optic).  
• We removed one panel of the OMC shroud, but this was not really helpful. 
• We rotated OM3 until we saw a beam coming out of the OMC REFL path.  The refl beam was fairly well aligned to the beam dump, and we were able to see some light on the OMC A QPD. 
• We measured that the beam enters HAM6 60 mm from the -x edge of the septum window. 
• We moved the beam dump behind OM2 so that it should catch the transmitted beam, although we weren't able to see any transmission.

Fast shutter:

• We attempted to follow the fast shutter wire dressing described in 37301, but we did not have a bolt that would fit in the threaded hole on the top of the fast shutter structure.  From the drawing (here) we think we need a 10-32 bolt, between 1 quarter and 3/8th inches long.  After a long search by many people, a bolt was found, but we aren't sure it's thread is right.

Still to do:

• Find a bolt and fix fast shutter wires.
• We need to move the shutter a little bit towards the OMC to center the beam on it, and make sure that the reflection hits the copper tube.
• Move the offsets on the OMs to center the beam on the OMC QPDs and check that we do not need to offload any more alignment.
• Check that the beam is centered on all the optics in the AS_C path
• Check the AS WFS path
• Check the AS air beam using the viewpoint simulator.
• Replace OMC shroud panel.