 Tue Sep 6 21:00:48 2011, Zach, Update, elog, elog restarted
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I restarted the elog with the script as it was not up when I tried to make a post. It was again unresponsive when I went to submit, but this time the
script couldn't restart it. The log said it couldn't bind to 8080, which usually happens if the daemon is still running. I pkilled it, then reran the script,
and it appears to be working. |
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Wed Sep 7 20:44:11 2011, Suresh, Update, elog, restarted
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Elog crashed / dormant for long time. A look at the log file indicated that it was busy generating png thumbnails for pdf files.
Restarted at Wed Sep 7 20:41:13 PDT 2011
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Tue Sep 27 11:43:59 2011, Jenne, Update, elog, Elog has been dying a lot lately...
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| WTF? |
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Tue Oct 25 21:23:17 2011, Dmass, Bureaucracy, elog, Elog Restarted
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| Elog went nonreponsive. SSH'ed into nodus to run restart script. Elog came back ~15 minutes later. |
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Fri Oct 28 02:41:18 2011, Suresh, Metaphysics, elog, elog unresponsive: restarted
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Elog did not respond despite running the /cvs/cds/caltech/elog/start-elog.csh script two times.
It worked the after the third restart.
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Wed Nov 2 14:07:25 2011, Zach, Update, elog, restarted
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| Elog was hanging, restarted with the script. |
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Mon Nov 7 11:50:42 2011, Jenne, Update, elog, Restarted elog
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| Elog restart script killed the elog, but didn't restart it. Restarted by hand. |
 Mon Nov 7 12:51:44 2011, Zach, Update, elog, Restarted elog
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I've noticed that it always takes running the script twice for it to actually work. I think there's something wrong with how it's doing it. I'll mess
with it sometime the elog isn't getting much use.
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Wed Nov 9 19:08:18 2011, Suresh, Update, elog, restarted elog
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| Elog was not responding and was restarted. |
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Fri Nov 11 00:58:19 2011, Den, Update, elog, restarted elog
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Elog suspended 2 times for 1 hour. Too high frequency.
Restarted. |
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Wed Nov 16 01:45:37 2011, Zach, Update, elog, restarted
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| Elog was hanging. Restarted it with script. |
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Wed Nov 16 02:36:35 2011, Koji, Update, elog, restarted
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Basically, elog hangs up by the visit of googlebot.
Googlebot repeatedly tries to obtain all (!) of entries by specifying "page0" and "mode=full".
Elogd seems not to have the way to block an access from the specified IP. |
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Wed Nov 16 10:13:13 2011, jamie, Update, elog, restarted
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Quote:
Basically, elog hangs up by the visit of googlebot. |
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Wed Nov 16 12:21:33 2011, Koji, Update, elog, googlebot (Re: restarted)
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- elogd itself is a sort of web server which has no freedom to put our own file, we can not put robots.txt
- If we include elog using proxy in the usual web tree of Apache, we can put robots.txt at the root.
- So far, if we prevent "page0" browse by google, we will be saved for a while. |
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Fri Nov 18 00:25:10 2011, Zach, Update, elog, restarted
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| with script. |
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Tue Nov 22 14:39:50 2011, Jenne, Update, elog, Afternoon elog restart
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| Gave the elog its afternoon / tea-time reboot, since it was hanging yet again. |
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Wed Nov 23 00:30:55 2011, Zach, Update, elog, sucks
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| Tried the script 3 times and it didn't come back. Pkill'd and then scripted. That worked. |
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Thu Nov 24 14:42:57 2011, Koji, Update, elog, elogd gained an immunity to googlebot
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I modified elogd.c as shown below in order not to allow to display all of the entries at once by specifying page number "0".
After this modification, elog seems to have survived 66 times of attacks by googlebots.
============================== |
Thu Nov 24 15:48:27 2011, Illustrator, Update, elog, elogd gained an immunity to googlebot 
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Mon Mar 26 12:50:24 2012, Zach, Update, elog, restarted with script
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| On the plus side, it was the first time I've had to do it in a while.. |
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Thu Aug 9 12:55:15 2012, Zach, Update, elog, elog was being a pain in the ass; I restarted it
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The elog was not responding. I attempted to restart it by running .../start-elog.csh, but this didn't work (even after the usual ~2 times it needs).
Somehow pkill did not kill the daemon, so I kill -9'd it and that did the trick. I ran the start script once more and it came back online. |
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Thu Sep 6 17:06:25 2012, Rijuparna Chakraborty, Configuration, elog, Cavitymode scan
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Aim: to scan the cavitymodes of IMC
The circuit used:
Attachment4 |
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Mon Sep 24 20:28:13 2012, rana, Summary, elog, restarted elog: was unresponsive
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Wed May 15 23:38:04 2013, rana, Update, elog, categories trimmed
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I deleted a bunch of useless categories from the 40m elogd.cfg file. IF you find your category has been deleted, you can now learn how to categorize
yourself into the existing categories. ELOG restarted and log file zeroed. |
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Wed Feb 5 18:36:56 2014, rana, Frogs, elog, MicroSoft BingBot is attacking us
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The ELOG was frozen, with this in the .log file:
GET /40m/?id=1279&select=1&rsort=Type HTTP/1.1
Cache-Control: no-cache |
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Fri Jun 6 14:56:09 2014, ericq, Update, elog, Aaaaaand we're back!
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| ELOG is back up and running after last Friday's disk-crash-a-thon. SVN is still a work in progress. Jenne and I are now restarting computers and such. |
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Wed Jun 25 01:18:24 2014, Akhil, Update, elog, Weekly Update
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Plans for the Week:
Phase and noise characterization of the UFC RF Frequency Counter.
Characterization of the temperature actuator.
Progress and Problems Faced: |
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Wed Jun 25 14:52:22 2014, Andres Medina, Update, elog, Placing a lens between the steering mirrors and another lens between the second steering mirror and the cavity
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I was asked to calculate the lenses that we need in order to obtained a Gouy phase close to 90 degrees between the two mirrors that are in the
Xend green. Yesterday, I measured the distances between the mirrors, and the distance between the mirror relative to the cavity as illustrate in the image
attached below. I looked in to the 40m elog and Manasa did the last update on the length of the cavity. She measured 37.7 + 0.05m. The waist size |
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Thu Jul 31 18:54:03 2014, Chris, Frogs, elog, MicroSoft BingBot is attacking us
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Quote:
The ELOG was frozen, with this in the .log file: |
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Thu Jul 31 21:21:49 2014, Koji, Frogs, elog, MicroSoft BingBot is attacking us
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Oh, this is cool! Thanks!
I could not figure out how to place robot.txt as it was not so obvious how elogd handles the files in the "logfile" directory. |
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Mon Dec 22 13:34:34 2014, Koji, Update, elog, Strange ELOG serach
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I tried to find my own entry and faced with a strange behavior of the elog.
The search button invoked the following link and no real search has been done:
http://nodus.ligo.caltech.edu:8080/40m/?mode=summvry&reverse=0&reverse=1&npp=50&m&y&Authorthor=Koji |
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Mon Dec 22 16:21:15 2014, ericq, Update, elog, Strange ELOG search
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In order to fix ELOG search, I have started running ELOG v2.9.2 on Nodus.
Sadly, due to changes in the software, we can no longer use one global write password. Instead, we must now operate
with registered users. |
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Tue Dec 23 16:49:32 2014, ericq, Update, elog, Strange ELOG search
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So, despite having registered users, it turns out that the "Author" field is still open for editing when making posts. I.e. we don't
really need to make new accounts for everyone.
Thus, I've made a user named "elog" with the old write password |
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Wed Feb 11 16:49:41 2015, rana, Update, elog, ELOGD restarted
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| No elog response from outside and no elogd process on nodus, so I restarted it using 'start-elog.csh'. |
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Sun Apr 26 00:08:56 2015, rana, HowTo, elog, Troubles with putting plots in external locations
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If it all possible, don't use links to your home directory. Its not robust. It would be like if you clicked on your Google Music and it told you
to ask me to sing that song to you. Imagine that on auto-repeat next time your fancy-bone itches. |
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Sat Mar 26 18:28:24 2016, Koji, Update, elog, elogd flakiness
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Elogd have been restarted several times today because it died everytime I submit something.
Here is the copy of the log.
GET /OMC_Lab/255?cmd=loc&value=Submit HTTP/1.1 |
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Fri Jan 27 19:40:03 2017, rana, Metaphysics, elog, word wrapping & large images
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"Why does the word wrapping not work in our browsers with ELOG?" I sometimes wonder. Some of the elogs are fine, but often the 40m one has
the text run off the page.
I found that this is due to people |
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Tue May 22 17:29:27 2018, keerthana, Update, elog, MEDM Diagram for the auxilary laser system control and display.
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(keerthana, gautam, jon)
In the morning, Jon gave me an overview of the Auxiliary laser system which we are planning to setup. Based on the diagram he uploaded in the
elog, I have made the MEDM diagram for controlling and displaying the parameters. Here the parameters which we will be controlling are temperature (in |
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Thu Jun 7 14:35:26 2018, keerthana, Update, elog, Table- useful for doing the scanning.
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I think this table will help us to fix the scanning range of the Marconi frequency. This will also help in predicting the position of the resonance peak
corresponding to the injected frequency.
fdiff = fm ±80 |
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Mon Jun 11 11:45:13 2018, keerthana , Update, elog, Comparison of the analytical and finesse values of TMS and FSR.
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Quantity
Analytical Value
Finesse Value
Percentage
Error
Free Spectral range (FSR)
3.893408 MHz
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Mon Jun 11 18:10:51 2018, Koji , Update, elog, Comparison of the analytical and finesse values of TMS and FSR.
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Hmm? What is the definition of the percentage error? I don't obtain these numbers from the given values.
And how was the finesse value obtained from the simulation result? Then what is the frequency resolution used in Finesse simulation? |
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Mon Jun 11 19:16:49 2018, keerthana, Update, elog, Comparison of the analytical and finesse values of TMS and FSR.
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The percentage error which I found out =[(analytical value - finesse value)/analytical value]*100
But inorder to find the finesse value, I just used curser to get the central frequency of each peak and by substracting one from the other I
found TMS and FSR. |
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Mon Jun 11 22:05:03 2018, Koji, Update, elog, Comparison of the analytical and finesse values of TMS and FSR.
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> The percentage error which I found out =[(analytical value - finesse value)/analytical value]*100
Yes, I this does not give us 0.70%
(3.893408 - 3.8863685)/3.893408 *100 = 0.18% |
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Mon Jun 11 22:18:18 2018, keerthana, Update, elog, Comparison of the analytical and finesse values of TMS and FSR.
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Oopss !! I made a mistake while taking the values from my notes. Sorry.
Quote:
> The percentage error which I found out =[(analytical value - finesse value)/analytical value]*100 |
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Wed Jun 13 11:59:03 2018, keerthana, Update, elog, command line enabled code for frequency scanning
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I have modified the code for frequency scanning and have made it completely command line enabled. The code is written in python. It is saved in the name
"frequency_scanning_argparse.py". I have uploaded it to the Mode-Spectroscopy Github repository.
Inorder to use this code there are two ways. |
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Thu Jun 21 13:24:00 2018, keerthana, Update, elog, The cavity scan data of June 20
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(Jon, Keerthana, Sandrine)
We tried to align the AUX and PSL laser yesterday. We collected the data from the spectrum analyser for the Y-ARM reflection and also for the
Y-ARM transmission from the ETM mirror. I am attaching the plots here. |
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Thu Jul 5 17:33:36 2018, keerthana, sandrine, Update, elog, Lights not working
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N/S ARM FL.
N/S ARM INC.
These two lights inside the 40m-lab are not working. |
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Thu Jul 5 17:58:04 2018, keerthana, sandrine, Update, elog,
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(Analisa, Sandrine, Keerthana)
Today Annalisa helped us to understand the new set up used to make the frequency scans of the AUX laser. While tracking the cables it seemed
that there were quite a lot of cables near the mixer. So we have reconnected one of the splitter which was splitting the RF out put signal from the Agilent |
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Thu Jul 12 14:06:39 2018, keerthana, Update, elog, Finesse and Analytical solution - Comparison
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I tried to compare the cavity scan data we get from the Finesse simulation and that we expect from the Analytical solution. The diagram of the cavity
I defined in Finesse is given below along with the values of different quantities I used. For the analytical solution I have used two different equations
and they are listed below. |
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Fri Dec 7 19:42:47 2018, rana, Frogs, elog, can't upgrade DokuWiki because of PHP / SL7
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All of our wikis (except the 40m one which unfortunately got turned into ligo.org mess) use DokuWiki. This now has an auto-upgrade feature through the
Admin web interface.
I tried this recently and it fails with this message: |