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40m Log |
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Wed Apr 13 00:56:07 2016, gautam, Update, endtable upgrade, X endtable repopulation
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Wed Apr 13 11:00:28 2016, Steve, Update, endtable upgrade, X endtable repopulation
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Wed Apr 13 18:25:07 2016, gautam, Update, endtable upgrade, Lightwave health check
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Fri Apr 15 18:38:12 2016, gautam, Update, endtable upgrade, Lightwave health check - NO IMPROVEMENT
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Tue Apr 19 18:37:29 2016, gautam, Update, endtable upgrade, Laser swap + optical layout
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Thu Apr 21 14:25:52 2016, gautam, Update, endtable upgrade, Green light recovered  
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Tue Apr 26 15:22:35 2016, Steve, Update, endtable upgrade, Cleaning ETMX vacuum dirty window 
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Tue Apr 26 23:19:42 2016, gautam, Update, endtable upgrade, Green aligned to arm - high order mode flashes seen 
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Thu Apr 28 00:41:08 2016, gautam, Update, endtable upgrade, more progress - Transmon PD installed
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Fri Apr 29 00:55:46 2016, gautam, Update, endtable upgrade, green PDH locked to Xarm
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Mon May 2 19:14:18 2016, gautam, Update, endtable upgrade, Optical layout almost complete
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Thu May 5 03:05:37 2016, gautam, Update, endtable upgrade, ALS status update  
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Thu May 5 04:05:03 2016, ericq, Update, LSC, Aux X PDH checks 
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Thu May 5 14:03:52 2016, ericq, Update, LSC, Further Aux X PDH tweaks
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Thu May 5 14:05:01 2016, rana, Update, endtable upgrade, ALS status update
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Thu May 5 21:28:44 2016, gautam, Update, endtable upgrade, Innolight PZT capacitance
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Thu May 19 16:29:20 2016, Steve, Update, endtable upgrade, Optical layout almost complete 
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Fri Sep 30 19:53:07 2016, gautam, Update, endtable upgrade, X end IR pickoff fiber coupled
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Wed Oct 5 16:28:10 2016, gautam, Update, endtable upgrade, EX laser power monitor PD installed
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Wed Apr 27 15:04:47 2016, Steve, Update, endtable upgrade, Cleaning ETMX vacuum dirty window
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Fri Apr 29 16:05:23 2016, gautam, Update, endtable upgrade, Cleaning ETMX vacuum dirty window
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Message ID: 12099
Entry time: Fri Apr 29 00:55:46 2016
In reply to: 12095
Reply to this: 12104
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Author: |
gautam |
Type: |
Update |
Category: |
endtable upgrade |
Subject: |
green PDH locked to Xarm |
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Using the modulation frequency suggested here, I hooked up the PDH setup at the X-end and succeeded in locking the green to the X arm. I then rotated the HWP after the green Faraday to maximize TRX output, which after a cursory alignment optimization is ~0.2 (I believe we were used to seeing ~0.3 before the end laser went wonky). Obviously much optimization/characterization remains to be done. But for tonight, I am closing the PSL and EX laser shutters and applying first contact to the window once more courtesy more PEEK from Koji's lab in W Bridge. Once this is taken care of, I can install the Oplev tomorrow, and then set about optimizing various things in a systematic way.. MC autolocker has also been disabled...
Side note: for the IR Transmon QPD, we'd like a post that is ~0.75" taller given the difference in beam height from the arm cavity and on the endtable. I will put together a drawing for Steve tomorrow.. |