Sheila, Kar Meng, Elenna, Jim
Yesterday Jim and I went to the chamber in the morning to work on cables. We got a solution for the cables after some work, but one peek zip tie luanched itself across the chamber. We spent a few hours searching for this; I climbed into the chamber on the -X side and could them see it on the bottom of the +Y door where Jim was able to reach through the port and retreive it.
In the afternoon Kar Meng and I went back to the chamber and found that the beam was blocked on the cable clamp that Jim and I had added earlier. The previous cable routing is shown here, the peek cable clamp is on the bottom of the pillar so that it doesn't block the beam. We removed the new alumium clamp and I tried to move it lower, the second from the top bolt hole is not the right size so we need to place this in the 3rd from the top hole. I found that difficult to reach and eventually decided to leave it for another day or ask for help from someone with longer reach.
After this we saw that our beam did arrive on AS_C in HAM6 but wasn't aligned onto AS_A or AS_B.
This morning Elenna, Kar Meng and I went to the chamber to see if we could improve the alignment. We walked B:M3 to align onto the second iris on SQZT7, and B:M4 to align onto the iris in front of ZM4, which seems degenerate with the iris at the bottom of the SQZT7 periscope. This worked well and we could see light on AS_B and AS_C although nothing on AS_A. We then went to the control room and moved ZM6 to center on AS_C better, then we could engage the AS centering loops.
This afternoon Kar Meng and I had another look at alignment from the control room. We have set the OMs back to their alignments during the run, and we still have the beams on AS_C, AS_A and AS_B although we are using a lot of the range on ZM6.
Still to do before finishing in HAM7:
