(Corey, Jax, Keita)

GREEN Beam Alignment & Power Measurements

Continued with alignment work from yesterday.  So, yesterday we had the green beam coming form the table into the chamber, centered on the QPDS, retroreflecting off the ETM, and heading back toward the table, but hitting the bottom periscope mirror under the TMS table.  So, first thing we did was pitch the TMS "up" (slid pitch masses back).  We adjusted a few BOSEMs after this pitch move.  Once we had pitch good, we roughly made it back out of the chamber through the viewport...but to do this we had to steer the TMS in yaw.  So we were off a little in yaw, but able to get back outside on the table with yaw bias.  But because we didn't want to use up all of our range, we were going to have to PUSH the entire TMS Assembly...we broke for lunch at this point to find out where the tools were.

Oh, should mention that we measured the green power as it (1) enters the TMS, and then the (2) reflected & (3) transmitted light of the BS which sends light to the Green QPD Sled....unfortunately, I wrote these values on the cds laptop.  So will post powers later.

Push In Yaw (& more Pitch) & Dropped Bolt

Set up to yaw the entire assembly counterclockwise (as seen from above the BSC chamber)...or basically a Right Handed Turn.  Now, the real estate is pretty tight upstairs.  while trying to install a teflon-tipped dog clamp on the rear-end of the TMS, I dropped a 3/8" bolt.  Luckily it didn't hit anything on the TMS, but I believe it went down underneath the temporary flooring.  Continue with setting up the pushers.  Once we were ready, we had the green beam & a damped TMS.  I then pushed the assy in yaw while Keita watched the beam.  This worked out well, and we fixed yaw.  I believed another BOSEM adjustment was made here...perhaps we did another pitch adjustment here (we did a few of them through the day).

BS for Hartman Path Missing

Realized we were missing an optic on the in-air table (BS to pick off for the Hartman path).  Aiden says this optic is on its way.   Anyway, we'll have to install that later (it'll change alignment, but we'll use irises to maintain alignment).

IR Path Work Begins:  Pointing Out IR Viewport & Beam Diverter Work

The green beam is also used to align the IR path.  We steered out this beam by steering the "entry" mirror for the IR path on the TMS table.  After this was done, Keita looked at the path for the Beam Diverter and steered the beam to the High Power Beam Dump.

Next:  IR Path to QPDs

Tomorrow, we'll continue with IR path (via green beam), and get the beam onto the IR QPD sled ("this is the trickiest job" says Keita....he says if it goes well, we might be able to finish this job Thurs, but it may carry over to Fri.  We shall see.)