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 Mon Oct 14 17:01:43 2019, anchal, Notes, Laser, South Laser Switched Off! 
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 Mon Oct 14 18:30:14 2019, anchal, Notes, PMC, South PMC Error Signal Oscillations
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Tue Oct 15 18:54:16 2019, anchal, Notes, PMC, South PMC further problems
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Wed Oct 16 16:56:43 2019, anchal, Notes, PMC, South PMC won't work with it's own Servo Card only
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Wed Oct 16 17:33:08 2019, Koji, Notes, PMC, South PMC won't work with it's own Servo Card only
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Wed Oct 16 18:46:58 2019, anchal, Notes, PMC, South PMC started working somehow :(
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Wed Oct 23 17:39:44 2019, anchal, Notes, PMC, South PMC started working somehow :(
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Fri Oct 25 16:50:12 2019, anchal, Notes, PMC, South PMC problem debugging efforts
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Tue Oct 29 19:10:59 2019, anchal, Notes, PMC, South PMC problem debugging efforts
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Wed Oct 30 15:15:28 2019, anchal, Notes, PMC, Replacing U5A AD602 didn't solve the issue.
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Wed Oct 30 18:35:31 2019, anchal, Notes, PMC, Issue closed
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Mon Nov 4 12:15:01 2019, anchal, Notes, PMC, Changing the autolocking method
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Message ID: 2451
Entry time: Mon Oct 14 17:01:43 2019
Reply to this: 2452
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| Author: |
anchal |
| Type: |
Notes |
| Category: |
Laser |
| Subject: |
South Laser Switched Off! |
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On Oct 11th at 15:04:04, the south laser switched off on its own. I would like to know if anyone entered the lab around this time. Koji did mention that our Laser Safety sign outside was blinking, but I have no more information than that. Attached is the data of south PMC reflection DC, which is the first photodiode that measures the laser. It suddenly went to zero, indicating the laser was switched off and the locks did not drive it to this point. I'm also finding that the laser intensity is reducedasit used to saturate the South PMC reflection photodiode when unlocked but presently shows around 5V. I'm trying to put the experiment back to same parameters as before.
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