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| 40m Log |
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 Sat May 9 00:15:21 2009, Yoichi, Update, PSL, Laser head temperature oscillation 
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 Sat May 9 02:20:11 2009, Jenne, Update, PSL, Laser head temperature oscillation
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Sat May 9 15:19:10 2009, rana, Update, PSL, Laser head temperature oscillation
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Mon May 11 11:49:20 2009, steve, Update, PSL, MOPA cooling water lines are backwards
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Thu May 21 18:07:32 2009, rana, Update, PSL, Screw on Needle valve loosened
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Message ID: 1569
Entry time: Sat May 9 02:20:11 2009
In reply to: 1568
Reply to this: 1570
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| Author: |
Jenne |
| Type: |
Update |
| Category: |
PSL |
| Subject: |
Laser head temperature oscillation |
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| Quote: | After the laser cooling pipe was unclogged, the laser head temperature has been oscillating in 24h period.
The laser power shows the same oscillation.
Moreover, there is a trend that the temperature is slowly creeping up.
We have to do something to stop this.
Or Rob has to finish his measurements before the laser dies. |
How's DTEC doing? I thought DTEC was kind of in charge of dealing with these kinds of things, but after our laser-cooling-"fixing", DTEC has been railed at 0, aka no range.
After glancing at DTEC with Dataviewer along with HTEMP and AMPMON (my internet is too slow to want to post the pic while ssh-ed into nodus), it looks like DTEC is oscillating along with HTEMP in terms of frequency, but perhaps DTEC is running out of range because it is so close to zero? Maybe? |