kiwamu.izumi@LIGO.ORG - posted 10:36, Thursday 22 September 2016 - last comment - 02:19, Friday 23 September 2016(29905)
beam quality study on HWSY
Nutsinee, Kiwamu,
This is a belated log.
In this past Tuesday, we went to the HWS table and checked two things in order to study unexplained behavior seen by HWSY (29738). No major conclusion yet.
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We checked the spatial profile of the launching beam using a Thorlabs beam profiler.
- We checked the beam up to the bottom periscope mirror. No obvious clipping was found.
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We checked the dependency of the returning beam position on the ITMY and CPY angles.
- This test was unfinished because we ran out the maintenance period.
- Nonetheless, according to a quick test, the beam(s) the HWSY camera receives seemed to be made of a reflection from ITMY and other reflection from CPY.
- To be continued.
By the way, we (re-)found that a green beam coming down to the same HWSY path was clipped at its bottom part.
During the activity, we stopped the HWSY camera code and left it off. At around 5:00 UTC (or 22:00 local), we started the code again. Because we had removed and re-attached the harmant plate, we started the code with a new template this time.