OFI was realigned by Gerardo. Irises on HAM6 were put in place by TJ.

We installed a temporary HWP on OFI.

The beam was first centered on the steering mirror on OFI closer to ZM2 by using the other steering mirror on OFI. The centering accuracy is not good but it's not that important.

Then the beam was centered on ZM2. Centering accuracy I would say is a mm or so.

We rotated ZM2 so the beam is centered on the HAM6 iris closer to VOPO (i.e. more important one) for YAW. Fortunately the PIT was already about right, we didn't have to rebalance ZM2. All PIT fine adjustment was done using one of the steering mirrors on OFI.

Only after the beam was centered on the HAM6 iris closer to VOPO, we moved the second HAM6 iris in place and centered the iris without touching the beam.

The beam dump to catch the septum window reflection was roughly adjusted by eyeballing. Unfortunately it was impossible to see the AR reflection using IR viewer and a card, so instead I looked at the reflection of the ZM2 mirror outline on the septum window while positioning my eye on the line connecting the IR beam position on the septum and the apex of the V of the beam dump. The power coming to sqz path is like 300uW as of now, AR reflection should be much smaller than uW. Maybe we can increase the power to 10W (a factor of 40 increase) and see the beam.

Sheila and Jenne measured the power of the beam in the main sqz path using a power meter.

ZM2 and beam dump dog clamps are not super tight as I wasn't able to find the right tools. They need to be tightened and after that we need to confirm that the beam still comes through both of the irises.

Pictures to show the positions of ZM2, beam dump and two irises will be posted later.