Sheila, Terry, Nutsinee

This is a late alog of work done last Thursday afternoon.   The main message is that we don't think we are close to clipping with the squeezer beam in the interferometer alignment used for the squeezing injection test on Tuesday. 

Checking the range on SRM alignments:

• For our first test we ran the SRC alignment according to the way the initial alignment guardian does it: with SRY locked, feedback AS_C to SR2+SRM and AS WFS to SRM, then we misaligned SRM and ran and offloaded the DC centering loops from AS_A and AS_B to OM2+OM2.  We also tried moving SRM, OM1+OM2 to their positions during the squeezing test using the osem readbacks, this was a slightly different alignment.  We injected a seed beam and engaged the DC loops that Haocun commissioned to actuate on the ZMs and center on AS A and AS B diodes.  We then moved SRM sliders letting the servos follow with ZM1+2, and watched the sum on AS_A and AS_B for signs of clipping.  We were able to move SRM quiet far compared to the normal range that it moves from lock to lock without seeing clipping; the ZM actuators actually saturated before we saw clipping.  We were able to move SRM sliders from 2183 to 1370 for pit, and from -1975 to -3796 for yaw.  
• For the next test, we kept the servos running to ZM1 and ZM2 and left SRM at it's nominal position, and moved each OM in each direction until we saw signs of clipping.  We returned each OM to it's starting position before trying a different degree of freedom.  We were able to see clipping for ZM slider values of:

• 	ZM1	ZM2
  OM1 P -633	-790 P	-410 P
  positive OM1P saturated ZMs before clipping
  OM1 Y -1434	1532 Y	1337Y
  positive OM1 Y saturated ZMs before clipping
  OM2 P negative saturated ZMs before clipping
  OM2 P -705	-372P	-1690P
  OM2 Y -312	1912Y	2267Y
  OM2Y -1870	2912Y	747Y

  During the squeezing injection test our ZM sliders were at ZM1 P -198 Y 2499 ZM2 P -301 Y -8825