camilla.compton@LIGO.ORG - posted 13:22, Tuesday 26 March 2024 - last comment - 15:19, Monday 01 April 2024(76715)
CO2X Beam Scan
TJ, Camilla, WP 11746, LLO did in LLO#14419
We blocked the beam path going into vaccunm (downstream of the BS) and the FLIR path. Photo during set A,B and C attached.
Mounted a razor blade to a 25mm transition stage.
At 1mm increments we measured the power transmitted to our PD (channel H1:TCS-ITMX_CO2_LSRPWR_MTR_OUTPUT).
We repeated this 3 times:
- Data set A: No mask. Razor blade 2 3/8" downstream of the center of the annular mask
- Data set B: Annular mask in mask. Razor blade 2 3/8" downstream of the center of the annular mask
- Data set C: No mask. Razor blade 10 7/8” upstream of the center of the annular mask
Data attached, still to be analyzed - use Matlab code from LLO#14419.
Data set A and B:
BS to Razor 8”
Razor to center of annular mask: 2 3/8”
Razor to center of center mask: 3 1/2”
Annular Mask to Mirror: 18 3/8“
Data set C:
BS to annular Mask = 10”
Razor to annular Mask = 10 7/8”
Razor to central Mask = 9 1/2”
Rasor to mirror = 5 1/2”
We attempted to use the Wincam beamscanner (as in 74914) to measure the beam before the periscope, setup in attached photo. the beam was too large so we need to shorten our beam path. Left in the two downstream mirrors and left the FLIR path blocked so we can continue this work on a future Tuesday.
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Using Matlab code from LLO#14419 with edit to parameter x = 4:1:26
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