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| 40m Log |
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 Wed Feb 20 01:40:37 2013, Manasa, Update, Alignment, Final IFO alignment- in progress
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 Wed Feb 20 03:13:10 2013, yuta, Update, Alignment, clipping centering checklist 
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Wed Feb 20 20:58:37 2013, yuta, Update, Alignment, clipping centering checklist
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Wed Feb 20 21:12:37 2013, rana, Update, Alignment, clipping centering checklist
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Wed Feb 20 21:56:08 2013, yuta, Update, Alignment, clipping centering checklist
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Wed Feb 20 10:13:41 2013, yuta, Update, Alignment, PRC flashing brighter than last week
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Message ID: 8115
Entry time: Wed Feb 20 10:13:41 2013
In reply to: 8113
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| Author: |
yuta |
| Type: |
Update |
| Category: |
Alignment |
| Subject: |
PRC flashing brighter than last week |
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After in-vac alignment work last night, PRC is flashing brighter than PRMI alignment last week.
My hypothesis is that "we aligned PRM to junk MI fringe last week". Possibly, we used MI fringe caused by AR reflection of ITMs, or MI fringe reflected from SRM.
Videos:
PRC flashing last week (youtube, elog #8085, elog #8091)
PRC flashing this time (Lens in-front of AS camera was taken out)
My hypothesis can explain:
- why we had dimmer POP last week (flash in half-PRC was way brighter even when we had more attenuators (youtube))
- why I thought AS55 is broken (AS was too dim)
Conclusion:
Be careful of junk beams. |