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| 40m Log |
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 Thu Aug 28 18:56:14 2008, rana, Configuration, PSL, beam block distorted
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 Fri Aug 29 10:20:32 2008, Yoichi, Configuration, PSL, beam block distorted
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Fri Aug 29 16:35:18 2008, Yoichi, Configuration, PSL, beam block distorted
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Message ID: 902
Entry time: Fri Aug 29 16:35:18 2008
In reply to: 893
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| Author: |
Yoichi |
| Type: |
Configuration |
| Category: |
PSL |
| Subject: |
beam block distorted |
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| Quote: | There was a beam block after the Mach Zender. Who or what put this there?
The going to the MC now looks distorted as if someone has left something funny in the beam or maybe the new PMC has started to degrade??
Use the ELOG people...its good for you. |
The apparent distortion of the MC refl. was caused by mis-alignment of the MC mirrors.
Because the MC1 was mis-aligned, the reflected light was clipped by a steering mirror.
I restored the MC angle bias values from the conlog history and now the MC locks.
According to conlog, the MC alignment was changed at around 18:30 on Thursday PDT.
It could have been caused by the computer reboots. |