- power at the bottom periscope mirror was measured to be 49W
- rotation stage max power set to this value
- 35W requested was 34.8W
- 2W req. was 1.89W
- power on the output of the PMC was 53.5W
- the IO path should not be dropping the power by 4.5W
- further measurements needed, with a different power meter head
- beam scan from PMC and bottom periscope mirror attached
- PMC beam looks round, still need to look at the waist
- Bottom Periscope is beam scan is not round
- evidence that adjustments to alleviate the clipping on the IO path are needed
Cheryl, Jason
plots of data for PMC, ideal, and measured, and beam scan data collected yesterday, as well as distances used for the plots in a matlab .m file, and a huge image (7.5MB).
beam scan data from the bottom periscope is attached, distances are from the PZT, and the lens after the bottom periscope mirror is ~238.5mm from the PZT.
DUE TO SPACE AND COOLING LINE ISSUES, the original power readings were done with a power meter head that is supposed to be water cooled, but currently isn't. The readings from yesterday matched very closely the power out of the PMC that was measured with the water cooled beam dump, and were consistent when running the power to max and min at the bottom periscope. The plan for today was to use the air-cooled power meter head that can go to 50W, that we borrowed from TCS (TVo), to verify power at the bottom periscope mirror and the PMC.