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 Mon Jan 23 15:16:52 2017, gautam, Update, Optical Levers, ETMY Oplev HeNe needs to be replaced 
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 Mon Jan 23 17:24:26 2017, Steve, Update, Optical Levers, ETMY Oplev HeNe is running hot
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Tue Jan 24 17:52:15 2017, Craig, Update, Optical Levers, ETMY Oplev HeNe is replaced 6x
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Wed Mar 1 08:28:04 2017, Steve, Update, Optical Levers, oplev laser RIN
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Thu Mar 2 13:59:04 2017, Steve, Update, Optical Levers, oplev laser RIN
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Thu Mar 2 17:58:45 2017, rana, Update, Optical Levers, oplev laser RIN
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Fri Mar 3 17:24:21 2017, Steve, Update, Optical Levers, oplev laser RIN
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Wed Mar 8 15:28:37 2017, Steve, Update, Optical Levers, oplev laser RIN
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Mon Apr 10 09:49:32 2017, Steve, Update, Optical Levers, oplev laser RIN test planning
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Mon Apr 10 14:21:57 2017, rana, Update, Optical Levers, oplev laser RIN test planning
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Tue May 30 13:36:58 2017, Steve, Update, Optical Levers, ETMY Oplev HeNe is replaced
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Tue Jan 15 18:16:00 2019, gautam, Update, Optical Levers, ETMY Oplev HeNe needs replacement
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Fri Jan 18 12:52:07 2019, gautam, Update, Optical Levers, BS/PRM Oplev HeNe replaced
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Message ID: 12750
Entry time: Tue Jan 24 17:52:15 2017
In reply to: 12747
Reply to this: 12858
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| Author: |
Craig |
| Type: |
Update |
| Category: |
Optical Levers |
| Subject: |
ETMY Oplev HeNe is replaced |
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Steve, Craig, Gautam
Today Steve replaced the ETMY He/Ne sr P919645 OpLev laser with sr P947049 and Craig realigned it using a new AR coated lenses.
Attached are the RIN of the OpLev QPD Sum channels. The ETMY OpLev RIN is much lower than when Gautam took the same measurement yesterday.
Also attached are the pitch and yaw OLG TFs to ensure we still have acceptable phase margins at the UGF.
The last three plots show the optical layout of the ETMY OpLev, a QPD reflection blocker we added to the table, and green light to ETMY not being blocked by any changes to the OpLev.
| Quote: |
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ETMY He/Ne body temp is ~45 C The laser was seated loosely in the V-mount with black rubber padding.
The enclosure has a stinky plastic smell from this black plastic. This laser was installed on Oct 5, 2016 See 1 year plot.
Oplev servo turned off. Thermocouple attached to the He/Ne
It will be replaced tomorrow morning.
| Quote: |
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On the control room monitors, I noticed that the IR TEM00 spot was moving around rather a lot in the Y arm. The last time this happened had something to do with the ETMY Oplev, so I took a look at the 30 day trend of the QPD sum, and saw that it was decaying steeply (Steve will update with a long term trend plot shortly). I noticed the RIN also seemed rather high, judging by how much the EPICS channel reading for the QPD sum was jumping around. Attached are the RIN spectra, taken with the OL spot well centered on the QPD and the arms locked to IR. Steve will swap the laser out if it is indeed the cluprit.
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