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tomotada.akutsu - 19:30 Wednesday 10 March 2021 (16219) Print this report
PMC not well

YamaT, Akutsu

PMC did not work well today. Although the output of the PMC beam profile seems TEM00, the output power was lower (0.3-0.7W) than that of yestereday, and varied in time, and varied in the different locks. Maybe related to 15566. It would be supported by the fact that the reflection of the PMC beam profile also contained much TEM00. This means this is not by mis-alignment.

Well, the input power was also lower about 30mW or so. Due to the trouoble shooting of the Dsub-to-BNC circuit, we disconnected the temperature control line to the innolight seed laser, and that might be the main reason.

This document might be useful.

Comments to this report:
takahiro.yamamoto - 20:42 Wednesday 10 March 2021 (16221) Print this report
After entering PSL room, laser power at fiber output decreased 10% and this situation is continuing.
I requested PMC DOWN just after entering.

At the same time, room temperature in PSL room also decrease.
(It seems to change too rapidly.

Laser power and room temperature are slowly coming back to original values.
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shinji.miyoki - 0:05 Thursday 11 March 2021 (16224) Print this report
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