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 Mon Jan 12 10:57:38 2009, rob, Update, General, some stuff
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 Mon Jan 12 18:53:03 2009, Yoichi, Update, LSC, AS CCD centering and ASDD demod phase
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Tue Jan 13 18:59:09 2009, Kakeru, Update, LSC, AS CCD centering and ASDD demod phase
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Wed Jan 21 16:18:17 2009, Kakeru, Update, LSC, AS CCD centering and ASDD demod phase
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Wed Jan 21 22:53:08 2009, rana, Update, LSC, AS CCD centering and ASDD demod phase
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Message ID: 1241
Entry time: Wed Jan 21 16:18:17 2009
In reply to: 1225
Reply to this: 1242
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| Author: |
Kakeru |
| Type: |
Update |
| Category: |
LSC |
| Subject: |
AS CCD centering and ASDD demod phase |
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I tuned the DD demod-pahse for SRM.
It was tuned as the error singnal is to be 0 when the cavity is locked.
The problem is that the good phase changes if MICH and PRM are handed to DD or not.
This may be a result of the demod-phase of these two signals are tuned to be maximise the error signal, not to be 0-offset.
I will tune these two demod-phases, and write a script to tune.
| Quote: | I tuned the demod-phase for PRCL and SRCL hand-off, but it have not been optimized enoughly.
I continue this work tomorrow.
| Quote: | After Rob's AS beam work, I centered the beam on the AS CCD.
I also optimized the ASDD demod-phase for the MICH signal.
Rob suggested to me that whenever we restart or change the frequency of the DD Marconis, we have to re-optimize the demod-phase
because the initial phase of the Marconi is random. We had the power failure, so it was time to do so.
I confirmed that MICH hand-off from REFL33Q to AS133DDQ is ok.
I will do the same thing for the PRCL, SRCL hand-offs. |
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