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| 40m Log |
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 Fri Apr 18 20:17:17 2014, Jenne, Update, LSC, ALS noisy 
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 Mon Apr 21 22:53:16 2014, manasa, Update, LSC, ALS noise
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Tue Apr 22 01:11:42 2014, Jenne, Update, LSC, TRY 60Hz noise
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Tue Apr 22 21:54:50 2014, manasa, Update, LSC, TRY 60Hz noise
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Tue Apr 22 22:49:10 2014, rana, Update, LSC, TRY 60Hz noise
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Wed Apr 23 19:58:00 2014, manasa, Update, LSC, TRY 60Hz noise
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Tue May 6 18:32:14 2014, steve, Update, LSC, TRY 60Hz noise hunt
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Wed May 7 14:01:36 2014, steve, Update, LSC, TRY 60Hz noise hunt
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Thu May 8 17:25:17 2014, steve, Update, LSC, TRY 60Hz noise hunt
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Fri May 16 16:08:12 2014, steve, Update, LSC, Isolating base plates
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Wed Apr 23 23:48:30 2014, manasa, Update, LSC, Y end whitening board
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Thu Apr 24 14:23:09 2014, not manasa, Update, LSC, Y end whitening board
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Thu Apr 24 23:55:31 2014, Koji, Update, LSC, Y end whitening board
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Fri Apr 25 10:43:57 2014, Koji, Update, LSC, (Fixed) Y end whitening board
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Thu Dec 11 18:12:46 2014, ericq, Update, LSC, (Fixed) Y end whitening board
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Thu Dec 11 22:44:23 2014, rana, Update, LSC, QPD screens
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Thu Apr 24 00:11:35 2014, Jenne, Update, LSC, Yend shutter back.
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Sun Apr 27 20:26:19 2014, Koji, Update, LSC, Phase Tracker servo characterization
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Sun Apr 27 21:30:59 2014, Koji, Update, LSC, ALS servo characterization
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Mon Apr 28 10:24:10 2014, Koji, Update, LSC, error signal characterization
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Mon Apr 28 10:34:51 2014, Koji, Update, LSC, new ALS servo design
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Mon Apr 28 10:48:48 2014, Koji, Update, LSC, new ALS servo design: comparison
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Mon Apr 28 10:59:54 2014, Koji, Update, LSC, New ALS servo design: expected error signals
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Mon Apr 28 11:08:11 2014, Koji, Update, LSC, New ALS servo design: expected error signals
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Message ID: 9841
Entry time: Tue Apr 22 21:54:50 2014
In reply to: 9838
Reply to this: 9842
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| Author: |
manasa |
| Type: |
Update |
| Category: |
LSC |
| Subject: |
TRY 60Hz noise |
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| Quote: |
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| Quote: |
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P.S. I realigned the Y green to the arm and brought GTRY to 0.93
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This evening, I was not able to successfully transition CARM from ALS to 1/sqrt(trans) signals. The TRY time series looked odd, so I took a spectra, and we have huge 60Hz noise in TRY.
Manasa, can you please take a look, and see if you can figure out what is going on? We need TRY so that we can transition to 1/sqrt(trans) signals for CARM. Thanks!!
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I went to the Y end to look at the TRY 60Hz noise situation this morning. While looking at TRY noise on dtt, I found that just lifting the cable away from the cable bunch that runs out of the table suppressed the noise drastically.
Attachment 1
I removed the unwanted bnc connector in the path of the already long TRY cable running from the PD to the 1Y4 rack and isolated it from the bunch. TRY became less noisy.
But the noise was back again earlier in the evening and it looks like the noise is very much related to the TRY cable. TRY cable might have moved from its sweet spot while I was around checking cable connections yesterday.
I couldn't find a spare to replace it right away today (We need a BNC to 4 pin lemo). |
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