TJ, Marie, Danny, TVo

During the maintenance period, we tried to fine tune the alignment of the CO2 laser by using the single bounce interferometer beam on SRM and look at the deflection at the AS port sensors (AS_A_DC and AS_B_DC) to overlap the CO2 with the IFO beam.  Our rough alignment was simply getting the beam centered on the viewport and centered on the first mirror in chamber, and hope that this is close enough to only adjust the top periscope mirror.

First, we had an issue with getting the suspensions to locally damp so there wasn't any light at the AS port, Jim and Corey tracked this down to a computer error in H1IOPSUSB123.

After that, we tried to align the SRM CO2 alignment into the chamber and found that we were able to get pitch relatively easily with the top periscope mirror but yaw was much more painful because as soon as we started to get close to overlapping the interferometer beam, it would start clipping either on the first mirror or the input hole of the SRM AR baffle.  For reference, I've attached a drawing from Corey A. showing the nominal beam path.  We then tried walking the beam with the top and bottom periscope mirrors but it wasn't helpful.  The next step may be to move the table and walk the beam with the top periscope mirror but we ran out of time.