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40m Log |
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Tue Feb 17 16:44:04 2015, Koji, Update, LSC, Delay line installed again
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Tue Feb 17 19:49:51 2015, Koji, Update, LSC, Delay line un-installed again
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Mon Feb 23 21:57:13 2015, Koji, Update, LSC, Delay line installed again (experiment, round 1)
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Tue Feb 24 01:57:01 2015, Jenne, Update, LSC, Modelled effect of relative modulation phase    
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Thu Feb 26 00:20:54 2015, ericq, Update, LSC, Modelled effect of relative modulation phase  
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Thu Feb 26 01:51:39 2015, ericq, Update, LSC, Sideband HOMs   
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Thu Feb 26 01:53:35 2015, Koji, Update, LSC, Modelled effect of relative modulation phase
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Tue Feb 24 23:39:16 2015, Jenne, Update, LSC, Delay line re-installed again
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Wed Feb 25 04:59:47 2015, Jenne, Update, LSC, Delay line re-installed, measurements round 2
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Wed Feb 25 12:16:27 2015, Koji, Update, LSC, Delay line re-installed, measurements round 2
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Wed Feb 25 14:18:28 2015, rana, Update, LSC, Delay line re-installed, measurements round 2
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Wed Feb 25 14:51:13 2015, Jenne, Update, LSC, Delay line un-installed again
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Wed Feb 25 20:00:39 2015, Jenne, Update, LSC, Delay line un-installed again - sensing matrix comparisons
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Wed Feb 25 23:48:57 2015, rana, Update, LSC, some thoughts
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Thu Feb 26 20:02:46 2015, Jenne, Update, LSC, re: some thoughts
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Message ID: 11071
Entry time: Wed Feb 25 23:48:57 2015
In reply to: 11070
Reply to this: 11080
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Author: |
rana |
Type: |
Update |
Category: |
LSC |
Subject: |
some thoughts |
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- Comparing just the 2 cases with locking on 33, it seems that the 55 MHz gain has changed by 14 dB instead of the 10 dB that we expected. Is it that we need to measure the modulation drive change more carefully, or just that the PRMI was aligned differently?
- The 165 signal changed by a factor of 60 (35 dB) which is more consistent with a ~12 dB change in Gamma2, so not so far off.
- The fact that the whole sensing matrix increases in amplitude between 33 and 55 lock makes me think that either the alignment was very bad for the 33 lock, or that the 33 signals have a significant offset; if that's the case, then we should do as LLO and set the digital offsets in the 33 signals by locking first on 55.
- How does the REFL33 demod phase change by 70 deg?
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