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 Fri Apr 24 03:57:30 2009, Yoichi, Update, Locking, DARM demod phase
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 Fri Apr 24 04:38:49 2009, Yoichi, Update, Locking, DARM demod phase
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Fri Apr 24 11:34:32 2009, rob, Update, Locking, DARM demod phase 
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Fri Apr 24 17:26:57 2009, Yoichi, Update, Locking, DARM demod phase
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Message ID: 1515
Entry time: Fri Apr 24 04:38:49 2009
In reply to: 1514
Reply to this: 1516
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| Author: |
Yoichi |
| Type: |
Update |
| Category: |
Locking |
| Subject: |
DARM demod phase |
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| Quote: | Tonight, I was able to go up to arm power = 40 by tweaking the DARM demodulation phase.
I think the DARM loop became unstable because the demodulation phase was not right and the error signal contained some junk from I-phase.
I did not do any sophisticated demodulation phase optimization. Rather I just tweaked the phase so that the dark port image becomes stable.
I will do more careful demodulation phase tuning next time. |
In the next try, I was actually able to go up to arm power = 70 stably.
At this power level we are ready for the RF CARM hand off. |