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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: 11912
Entry time: Tue Jan 5 16:33:45 2016
In reply to: 11910
Reply to this: 11917
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Author: |
ericq |
Type: |
Update |
Category: |
LSC |
Subject: |
AUX X Freq Noise attempt |
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Turning on the MCL path (in addition to the MCL FF we always have on) let me lock the PLL for multiple seconds, but low frequency excursions still break it in the end. I was able to briefly observe a level of ~50Hz/rtHz at 1kHz, which may or may not be real. Tomorrow we'll send the PLL control signal to MC2, which should lock it up just fine and give us time to twiddle laser diode current, measure the PLL loop shape, etc. |