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| 40m Log |
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 Mon Feb 25 15:30:29 2013, yuta, Update, Alignment, Y arm locked, both colors
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 Mon Feb 25 17:58:28 2013, rana, Update, Alignment, Y arm locked, both colors
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Mon Feb 25 22:42:32 2013, yuta, Summary, Alignment, current IFO situation 
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Mon Feb 25 21:25:14 2013, yuta, Update, Alignment, both arms locked in IR
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Tue Feb 26 01:49:27 2013, Jenne, Update, Locking, PRMI locked
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Tue Feb 26 02:04:51 2013, Koji, Update, Locking, PRMI locked
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Tue Feb 26 11:55:11 2013, Manasa, Update, Locking, FPMI locked
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Tue Feb 26 15:32:47 2013, Jenne, Update, Locking, FPMI locked
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Wed Feb 27 01:09:53 2013, yuta, Update, Locking, PRMI sideband/carrier locked 6x
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Wed Feb 27 02:44:39 2013, Jenne, Update, Locking, DRFPMI flashes
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Wed Feb 27 20:10:43 2013, rana, Update, Locking, DRFPMI flashes
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Message ID: 8166
Entry time: Tue Feb 26 02:04:51 2013
In reply to: 8165
Reply to this: 8170
8177
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| Author: |
Koji |
| Type: |
Update |
| Category: |
Locking |
| Subject: |
PRMI locked |
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One of the biggest issues we had was that any Q signals (i.e. the quadrature where PRCL is absent.) of REFL11/33/55/(165) haven't been consistent each other.
i.e. We never had reliable lock of MICH with REFL_any_Q, regardless of the resonant condition. This is definitely one of the things to be tried in order to prepare for the full lock.
We don't trust any demodulation phases of any PDs any more as the previous PRC mode (or say, absence of the stable mode) was unreasonable to determine any of the demodulation phases.
I remember that the POP DC saturates at 27000. You may need to reduce the gain switch again.
The AS OSA and/or POP BBPD would be useful for the sideband PR gain estimation. |