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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: 11926
Entry time: Tue Jan 12 03:03:55 2016
In reply to: 11925
Reply to this: 11929
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Author: |
ericq |
Type: |
Update |
Category: |
LSC |
Subject: |
Frequently making noise |
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Gautam will soon follow up with detailed analysis, but here is a brief summary of some of our activities and findings.
- Two Marconis were beat together in various ways, we figured the noise added by turning on external modulation didn't make us happy.
- I locked the AUX X laser to the PSL via PZT. I'm more likely to believe we're seeing real broadband laser noise in this configuration; locking the the PSL laser to the IMC brought the noise down in a reasonable way. The PLL bandwidth was a smidge over 100k.
- We saw a factor ~6 increase in noise when changing the diode current from 1.8 to 1.96A. We'll be following this up at more temperatures and currents soon.
- Gautam will verify the AUX X laser PZT calibration tomorrow, and post calibrated spectra of this increase.
Please note that there is a long BNC cable still laid out from the IOO rack area to the X end table; watch your step! |