 Tue Aug 25 21:36:28 2009, Alberto, Update, PSL, reference cavity temp box temporarly out of order 
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Is that the reason of the PSL craziness tonight? See attachment. |
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Tue Aug 25 21:55:11 2009, rana, Update, PSL, reference cavity temp box temporarly out of order
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There's no elog entry about what work has gone on today, but it looks like Peter took apart the reference cavity temperature control around 2PM.
I touched the reference cavity by putting my finger up underneath its sweater and it was nearly too hot to keep my finger in there. I looked at
the heater power supply front panel and it seems that it was railed at 30 V and 3 A. The nominal value according to the sticker on the front is 11.5 V |
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Wed Aug 26 15:42:17 2009, Alberto, Update, PSL, reference cavity temp box temporarly out of order
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Quote:
There's no elog entry about what work has gone on today, but it looks like Peter took apart the reference cavity temperature |
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Wed Aug 26 16:11:41 2009, Alberto, Update, PSL, reference cavity temp box temporarly out of order
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It turned out that half an hour was too long. In less than that the reference cavity temperature passed the critical point when the temperature controller
(located just below the ref cav power supply in the same rack) disables the input power to the reference cavity power supply.
The controller's display in the front shows two numbers. The first goes with the temperature of the reference cavity; the second is a threshold |
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Wed Aug 26 16:31:34 2009, steve, Update, PSL, reference cavity temp box temporarly out of order
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Quote:
It turned out that half an hour was too long. In less than that the reference cavity temperature passed the critical |
 Thu Oct 20 12:43:19 2011, steve, Update, SAFETY, refilled first aid kits & their locations 8x
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First aid kits are located close vicinity of entry doors and under circuit breaker panels.
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Sun May 16 12:51:08 2010, kiwamu, Update, Green Locking, reflected beam at PD
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Mode matching to the cavity has been done.
Now the reflection from the cavity is successfully going into the PD.
However I could not see any obvious error signal. |
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Sun May 16 19:25:45 2010, Koji, Update, Green Locking, reflected beam at PD
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Don't make a short cut. The beam size at a single place does not tell you anything.
Measure the mode of of the beam at multiple points. Calculate the mode matching ratio.
Align the mirrors precisely. Try to see the DC fringe. Predict the size of the DC fringe. |
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Mon Apr 7 18:58:49 2008, steve, Update, General, reflectivity of SS304
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The reflectivity of stainless steel 304 super polished # 8 was measured the same way as elog entry 409
The reflectivity: 74 +- 1 % from incident angle 10 to 80 degrees |
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Wed Apr 2 15:03:51 2008, steve, Update, General, reflectivity of black glass
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The reflectivity of black glass, shade 12 was supplied by Donald O'Shea
of Emerald Glass Inc., Westlake, OH 44145
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Tue Feb 14 17:09:05 2012, steve, Update, General, reflectivity of green welding glass
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Schott, Athermal green welding glass, shade #14 reflectivity was measured in 1.2W, ~1 mm diameter beam of MC reflected.
The P polarization measurement was done with the help of half wave plate and PBC
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Fri Dec 9 15:14:41 2011, Den, Update, CDS, release 2.4
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Alex has created a 2.4 branch of the RCD. Jamie, we can try to compile and install it. As a test a did it for c1oaf, it compiles, installs and runs once
variables SITE, IFO, RCD_LIBRARY_PATH are properly defined. As we do not want to run one model at 2.4 code and others at 2.1, I recompiled c1oaf back to
2.1. Jamie, please, let me know when you are ready to upgrade to 2.4 release. |
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Thu Mar 7 18:48:43 2013, yuta, Update, Computer Scripts / Programs, releasing my secret scripts
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I released/updated my secret scripts to real scripts directory.
I checked they run correctly (but maybe not working correctly).
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Fri Sep 18 09:06:26 2015, rana, Frogs, Computer Scripts / Programs, remote data access: volume 1, Inferno
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Trying to download some data using matlab today, I found that my ole mDV stuff doesn't work because its MEX files were built for AMD64...
Tried to rebuild the NDS1 MEX according to 7 year old instructions didn't work; our GCC is 'too' new.
From the Remote Data Access wiki (https://wiki.ligo.org/RemoteAccess/MatlabTools) I got the new 'get_data.m' and 'GWdata.m'. |
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Fri Sep 18 19:19:49 2015, rana, Frogs, Computer Scripts / Programs, remote data access: volume 1, Inferno
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NDS2 restarted after hours long upgrade process; testing has begun. Let's try to get some long stretches of MC locked with MCL FF ON this weekend
so's I can test out the angular FF idea. |
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Wed Nov 25 22:37:12 2015, yutaro, Update, LSC, removal of Gautam's cable in 1Y2 and restoration of POYDC
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[yutaro, Koji]
We disconnected the cable that was connected to CH5 of the whitening filter in 1Y2, then connected POYDC cable to there (CH5). This channel
is where POYDC used to connect. |
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Fri May 7 21:55:59 2010, kiwamu, Update, PSL, remove Mach-Zehnder
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[Koji, Kiwamu]
The Mach-Zehnder on the PSL table was removed.
A path for 166 MHz modulation in the Mach-Zehnder (MZ) was completely removed, the setup for another path remains the same as before. |
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Tue Feb 26 10:17:44 2013, Jamie, Update, SUS, removed global/local switch from sus_single_control
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[jamie, brett]
Yesterday we added some new control logic to the sus_single_control part to allow for
global damping. Today we decided that a binary switch between local/global damping was probably a bit extreme since we might want to smoothly ramp |
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Mon Nov 2 13:34:36 2009, kiwamu, Configuration, PSL, removed multiply resonant EOM
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I removed the multiply resonant EOM that has been set by a SURF student from PSL table.
I will use it for checking the resonant circuit. |
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Thu Aug 1 16:03:52 2013, Steve, Update, General, reopen BS & IOO
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Quote:
[Koji, Manasa] |
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Mon Mar 18 14:58:15 2013, Steve, Update, Green Locking, repair or replace dead NPRO
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JDSU can repair the Lightwave M126-1064-700 NPRO, sn 415 They do not need the Controller sn 516
Posted in the 40m Wiki_ PSL_ NPRO cost repair and/or option to buy Innolight laser as replacement |
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Fri Dec 2 16:21:12 2016, gautam, Update, General, repaired projector, new mixer arrived and installed
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The most recent power outage took out our projector and mixer. The projector was sent for repair while we ordered a new mixer. Both arrived today. Steve
is working on re-installing the projector right now, and I installed the mixer which was verified to be working with our DAFI system (although the 60Hz
issue still remains to be sorted out). The current channel configuration is: |
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Tue Jan 11 17:08:43 2011, Suresh, Configuration, PSL, replaced the pzt-steering mirror on PSL
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[Rana, Jenne, Suresh]
Yesterday, We replaced the existing beam steering mirror and the PZT it was mounted on with a Gooch and Housego
mirror (20ppm transmission at < 30deg incidence @1064nm) and a Polaris-K |
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Tue Feb 12 16:39:52 2008, rob, Update, Locking, report
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Did some locking work on DRFPMI on sunday and (with John) on monday nights. So far progress has not been terribly encouraging.
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Thu Jun 12 01:51:23 2008, rob, Update, Locking, report
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[I]rob, john[/I]
We've been working (nights) on getting the IFO locked this week. There's been fairly steady incremental progress each night, and tonight we managed to |
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Thu Jun 12 15:09:33 2008, alan, Update, Locking, report
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Rob: Awesome figure. As you can imagine, I have lots of questions, and hope that you will consider this figure to be the beginning, leading to ever-more
detailed versions. But for now, I just want to ask whether you understand *what* is twitchy, and what the twitchiness does to prevent you from taking this
further? |
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Thu Jun 12 15:55:15 2008, rob, Update, Locking, report
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[quote]Rob: Awesome figure. As you can imagine, I have lots of questions, and hope that you will consider this figure to be the beginning, leading to ever-more
detailed versions. But for now, I just want to ask whether you understand *what* is twitchy, and what the twitchiness does to prevent you from taking this
further?[/quote]
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Wed Aug 12 02:00:32 2009, rob, Update, Locking, report
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Spent a lot of time aligning tonight. The BS is not staying put--sometimes after a lock loss it gets badly mis-aligned.
DD handoff is working, after putting beam on REFL diodes and running senseDRM script. |
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Wed Aug 19 23:57:35 2009, rob, Update, Locking, report
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locking work proceeding apace tonight.
diagonalized DRM with setDDphases & senseDRM. |
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Tue Jun 21 00:38:21 2011, Sonali, Update, Green Locking, repositioned "QPDY_PD"
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1.The aim is the laser frequency stabilisation of PSL and AUX.
2.As a first step we want to couple some of the AUX laser beam into a single mode optical fibre and route the fibre to the PSL table.
3.The position of the optical fibre on the ETMY table is shown by the coupler in the attached picture. The yellow lines show the new scheme we |
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Tue Jun 2 23:53:12 2009, pete, DAQ, Computers, reset c1susvme1
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rob, alberto, rana, pete
we reset this computer, which was out of sync (16384 in the FE_SYNC field instead of 0) |
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Tue Sep 9 09:19:21 2014, Steve, Update, safety, response to fried Sorensen
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Quote:
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Thu Aug 12 23:17:54 2010, Zach, Update, elog, restarted
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| script |
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Thu Aug 12 23:41:48 2010, Jenne, Update, elog, restarted
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Quote:
script |
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Fri Aug 13 13:11:30 2010, Dmass, Update, elog, restarted
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Quote:
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Thu Aug 19 21:56:02 2010, Zach, Update, elog, restarted
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| script |
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Tue Aug 24 17:57:57 2010, Zach, Update, elog, restarted
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Restarted the elog using the script. I had to do it twice for it to work. This is not the first time this has happened---does anyone know why this
might be? |
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Tue Aug 24 22:26:16 2010, Zach, Update, elog, restarted
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took two again
Quote:
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Tue Dec 14 09:26:17 2010, Zach, Update, elog, restarted
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| Restarted the elog with the script |
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Sat Dec 18 06:24:49 2010, rana, Update, elog, restarted
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The process was taking up 100% of the CPU and not responding via web. The .log file showed the last action was somebody reading/editing one of Jenne's
entries from August regarding TT ECD. The restart script didn't work, so I had to do a 'kill -9' to get it to die. |
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Sat Dec 18 23:33:06 2010, Koji, Update, elog, restarted
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Did the same.
Quote:
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Sun Dec 19 11:19:42 2010, Koji, Update, elog, restarted
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Did it again. It seemed that Google bot came to the elog and tried to obtain "http://nodus.ligo.caltech.edu:8080/robots.txt". That was the
last of the log.
Bot came from the AJW's homepage. Also Google FeedFecther came to the elog. |
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Sun Dec 19 22:45:28 2010, rana, Update, elog, restarted
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I deleted the yellow box which showed up by default when making an elog entry. Would be nice if we could make it so that you have to click a button to
'opt-in' for the yellow box rather than get it by default.
I added a 'robots.txt' file to the /users/public_html/ area using Google's |
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Wed Jan 5 10:45:51 2011, Koji, Update, elog, restarted
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Google bot crashed the elog again. Then, I found that Google bot (and I) can crash elogd by trying to show the threaded view.
There looks similar issue reported to the elog forum, the author did not think this is a true bag.
Note: This happens only for the 40m elog. The other elogs (ATF/PSL/TCS/SUS/Cryo) are OK for the threaded view. |
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Wed Jan 5 21:19:29 2011, Zach, Update, elog, restarted
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| Restarted the elog with the script |
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Mon Feb 21 11:05:51 2011, Zach, Update, elog, restarted
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| I restarted the elog using the script. |
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Mon Feb 21 23:00:06 2011, Zach, Summary, elog, restarted
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| again |
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Fri Mar 4 13:25:04 2011, Zach, Update, elog, restarted
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| with script |
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Fri Apr 22 02:10:53 2011, Zach, Update, elog, restarted
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| Restarted the elog with the script. |
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Tue Apr 26 22:56:35 2011, Zach, Update, elog, restarted
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| with script |