[Matthew Ball, Jenne]

We are looking at HWS images that compare our status at 2W versus the status at 1000 sec after powering up to 37W for times before and after we changed our global alignment of the interferometer.  Attached are 2 screenshots, one for the 22nd of July (old alignment), and one for today with the new alignment.  Each screenshot has all 4 test masses, although in both screenshots it's clear that the ETMY HWS isn't working so well, and so we cannot trust any of the data from that HWS.

Recall that it's tricky to compare then-vs-now HWS images, since the color bars are different.  Both Xarm test masses seem to have lower overall wavefront distortion in the August screenshot than they did in July.  ETMX's Aug image looks like we're illuminating a point absorber, but it's possible that that absorber is just being drowned out in the July image by the larger wavefront distortion in the lower left of the ETMX image.

THe ITMY image looks like the overall distortion is higher now than in July.  We seem to be illuminating the main point absorber more strongly now, and are illuminating the secondary absorber that is higher up a little less.  This is consistent with our understanding that before the new alignment, we were straddling those two absorbers on ITMY, but now we are on the low side of the main absorber. 

TBD: See if the spot moving to find the good buildups with our new alignment was slow enough that we are able to make meaningful HWS images, or if I was moving faster than the optics would have thermalized.  If it was slow enough, we should look at equivalent HWS images for various times during that lock.