Corey, Keita, Kiwamu,

We conituned working on the remaining tasks for the TMSX in chamber (see alog 19157 from yesterday).

[Strain Relief for QPDs]

This morning we installed the strain reliefs for the two QPDs in which we had a difficulty inserting a screw due to bad threading. Today, we brought 10-32 screws so that the screw can go all the way through to the back without any interference from the bad threads. We put combination of a nut and washer on the other side to hold the 10-32 screw and the strain relief parts. We did this on the two QPDs. So now all four QPDs have the strain reflef parts installed.

[Balancing of the table]

We then balanced the table such that the green light is retro-reflected off of ETMY. The table seemed to have pitched by some amount. We decided to move the counter mass at the bottom of the table. The adjustement went very smooth and we were able to get the beam retrao-reflected all the way back to the PD on the ISCTEX table. Touching the TMS digital bias suggested that the pitch angle is good with a precision of about 4 urad. While pitch is good, yaw seemed to be slightly off. So we moved the digital bias in yaw as well and confirmed that adding an additional +40 urad (resulting in a bias of ) in the digital bias can give us a decent alignment on the reflection PD. So we are good in yaw too.

[Addendum]

After initial balancing we were concerned that we did not use vented washers for the two QPDs which required the screw/nut workaround.  Keita found that one QPD did NOT have a vented washer, so a vented washer was installed.  This required a re-balance.  We were a little off in pitch, so a counterweight (1/4-20 screw) was added to pitch the TMS.

Photos of this work from Mon afternoon & Tues morning is on ResourceSpace here.

EX is now Laser Safe.

(And ready for the SUS crew to take over.)