Nutsinee, Elli

We have aligned EX HWS to within ~+/-5cm from the ETMX image plane.  This is as good as we can get with the current level of motion in the HWS images.  To locate the image plane more acurately, the next step is to understand why there is this variation in the HWS images.

The distances on the HWS path are now:

L1-L2: 610mm (unchanged)

L2-L3: 877mm

L3-HWS:  1593mm

To do this we applied a 0.05mHz, 2microrad yaw excitation to the M0 optic align filter bank, and looked at the motion of the x centroid in the HWS images.  We moved L3 51mm towards L2, the HWS 57mm away from L3, and mirrors M7 and M8 each 80mm to the right to the lengthen L3 to HWS path.  We also adjusted the pitch of ALS-BS 1 to lower the beam on HWS-M1, which was clipping slightly.