[Sheila, Eric, Kar Meng, Daniel]

At the time of removing soft cover, the particle count was ~2. We begun with the OPO dither locked. We also updated the ramp time on the PSAM controllers to be 100ms (they were at 1ms). It seems like the PSAMS are reading back the correct value (matches setpoint/target).

Betsy provided us with the screws for locking down the VIP, they are a #10 button head screw but they seem to fit in the slot for the locking mechanism. We have no washers for the #10 screw, which is not ideal. The #10 button head is not sufficiently wide enough and only engaged on one side of the slot. As a compromise, a 1/4" washer was tried to buffer this. Unfortunately, this was thick enough to prevent the screw from engaging on the threads, so two of the other bolts were installed without washers. One of the bolts that was installed is the correct bolt/washer. Once all the screws were in, the thumb screws were tightened and the OSEMs were checked. Pitch yaw and roll are all less than 1urad different. Vertical displacement is 100um different.

After finishing locking down: particle count was ~ 60

We were thinking about moving the second iris on the sqz path from between ZM3 and FC1 to between ZM2 and ZM3 so that we could see the retroreflection from the FC, but we abandoned this idea because Sheila thinks it wont be that helpful considering how difficult it seems it would be to move it there. As far as irises go, all the irises we need to install in the HAM7 chamber have been placed. We have irises installed on the transmission path to the homodyne and the CLF path on T7. It looks like the homodyne/transmission path is slightly misaligned relative to the irises placed before the vent (see images attached). We also still need to install one final iris on the green pump REFL path on T7 before we remove the OPO. We could not install this today because we could not get the SHG to lock.

We were having quite a bit of trouble dither locking the OPO, so the seed/clf input alignment may be a bit off. TEM01 and TEM00 have very similar dip fractions. By adjusting the locking code, Sheila was able to get the OPO locked to the TEM00 mode. 

At the end of the day, we adjusted the iris between ZM3 and FC1 for better centering and placed 2 dogs around the OPO.