This morning we noticed that the magnetic rotator is not in full contact with its mount. Cheryl identified the problem as due to the fact that the thru-holes drilled in the restraining Omega-shaped rings are not well matched to the corresponding screw-holes in the mount. I gave her the restraining rings for adjustment.
This means that the magnetic rotator is not secured in its mount at the moment. I will not be placing any optics (TGGs and Quartz) inside the magnet until it is secured (required for steps 20-on of the procedure in E0900301).
I have gone through steps 1 thru 19 of E0900301 (at low powers only).
Steps 16-17, s-pol extinction by the 1st Calcite Wedge Polarizor:
| incident | trans s-pol | extinction |
| 1 W | 0.59 µW | 62.2 dB |
| 5 W | 0.13 mW | 45.8 dB |
| 10 W | 0.26 mW | 45.8 dB |
Step 19, s-pol extinction by both CWPs:
| incident | trans s-pol | extinction |
| 9.85 W | 0.313 mW | 45.0 dB |
Some more adjustment is needed to get to the required extinction of 50 dB.