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40m Log |
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Thu Dec 17 01:55:16 2015, ericq, Update, LSC, Uncooperative AUX X
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Fri Dec 18 17:37:04 2015, rana, Update, LSC, Uncooperative AUX X
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Mon Dec 21 02:29:49 2015, ericq, Update, LSC, AUX X RIN measurements
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Tue Jan 5 02:54:38 2016, ericq, Update, LSC, AUX X Freq Noise attempt
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Tue Jan 5 13:17:06 2016, rana, Update, LSC, AUX X Freq Noise attempt
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Tue Jan 5 16:33:45 2016, ericq, Update, LSC, AUX X Freq Noise attempt
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Thu Jan 7 04:28:39 2016, ericq, Update, LSC, AUX X Freq Noise measured 
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Thu Jan 7 16:52:32 2016, ericq, Update, LSC, AUX X Freq Noise measured 
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Thu Jan 7 19:04:25 2016, Koji, Update, LSC, AUX X Freq Noise measured
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Fri Jan 8 14:47:33 2016, ericq, Update, LSC, AUX Y Freq Noise measured 
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Fri Jan 8 20:02:49 2016, rana, Update, LSC, AUX Y Freq Noise measured
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Sat Jan 9 00:39:15 2016, gautam, Update, LSC, AUX Y Freq Noise re-measured
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Mon Jan 11 19:01:56 2016, gautam, Update, LSC, PLL Marconi Investigation 6x
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Tue Jan 12 03:03:55 2016, ericq, Update, LSC, Frequently making noise
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Tue Jan 12 19:38:31 2016, gautam, Update, LSC, Frequently making noise    
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Message ID: 11910
Entry time: Tue Jan 5 13:17:06 2016
In reply to: 11908
Reply to this: 11912
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Author: |
rana |
Type: |
Update |
Category: |
LSC |
Subject: |
AUX X Freq Noise attempt |
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The problem here is that the MC displacement noise is leading to large frequency excursions of the PSL beam. Options
- Feed back the low frequency PLL control signal to the MC2 length to suppress the excursion required by the Marconi. This is better than driving the laser, since the drive to the laser would be squashed by the MC locking loop.
- Put the beat signal through a divider? Don't know if this makes the Marconi more able to handle it.
- Turn on the MCL path. this will make the low frequency MC error signal go to the MC length, thereby reducing the low frequency feedback to the NPRO.
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