[Betsy, TJ, Fil, RichM, Peter, Koji, Calum, RichA (remote)]

Progress

- The OMCT path (Y+) was aligned. Using 10W input instead of 2W helped us to find the leakage cavity flash through the PZT mirrors with 50ppm transmission. In the end we confirmed that the beam is well close to the center of the viewport (simulator) using a sensor card+an IR viewer and a CDD setup.

- The other OMCT beam (Y- side) was found to be blocked by one of the panels of the black glass shroud. We needed to shift the Y- panel more than the allowed range by the design. In order to allow this shift, we flipped a PEEK bushing and removed some of the washers and viton O-rings on the captive compliant fixing screws. Two screws to hold the glass holder were also removed to widen the sliding range. (See attachment 1, 2)

- The light powers in HAM6 were measured at various positions. This will be analyzed in a different entry.

- The funtionarity of the picomotors were confirmed (cf. channel assignment ALOG LHO 16422). Also we confirmed that the two beam diverters are working.

- We found that failure of the fast mechanical. We could not close the shutter because the coil wire has an open connection. Close inspection revealed that the coil wire has a kink (attachment 3). By jiggling this kink we actually could fluctuate the coil resistance from 20Ohm to infinity. The replacement shutter was immediately sent from CIT. It is coming here tomorrow morning.

To Do (Tue afternoon)

- Install the replacement fast shutter.
- Ground loop check
- Other SUS/SEI exit procedure