 Fri Aug 8 14:27:18 2014, Akhil, Update, Computer Scripts / Programs, FOL Scripts
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The scripts written for interfacing the FC with R Pi, building EPICS database, piping data into EPICS channels,PID loop for FOL are contained in
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/opt/rtcds/caltech/c1/scripts/FOL |
 Fri Aug 8 14:42:41 2014, Akhil, Update, General, PID loop Design for beat note stabilization 
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The attached in a zip file are the Simulink feedback loop models for the FOL for both X and Y ends. The controller PID values are estimated by
setting a temperature count reference point to 5344, which corresponds to 100 MHz frequency. The plant transfer function is as calculated in my previous
elogs. |
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Sun Feb 10 20:47:01 2008, Alan, Summary, SUS, All watchdogs tripped
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A moderate earthquake occurred at 11:12:06 PM (PST) on Friday, February 8, 2008.
The magnitude 5.1 event occurred 21 km (13 miles) NW of Guadalupe Victoria, Baja California, Mexico.
http://quake.wr.usgs.gov/recenteqs/Quakes/ci14346868.html |
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Mon Oct 20 12:18:38 2008, Alan, Update, Computer Scripts / Programs, burtwb missing on Solaris but installed on linux64
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[quote]c1lsc stalled this evening, so I powercycled it.
After that, I tried to lock arms to confirm the computer is working.
Then I realized that the restore alignment buttons do not work from any control room computer.
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Mon Oct 20 16:18:00 2008, Alan, Configuration, Computers, /cvs/cds restored
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[quote]I moved missing files in /cvs/cds restored by Alan and Stuart to the original locations.
I confirmed autoburt runs, and dtt, which had also been having trouble running, runs ok now.
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Sun Jan 4 13:17:23 2009, Alan, Omnistructure, Computer Scripts / Programs, New 40mWebStatus
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I have set up some code in /cvs/cds/caltech/scripts/webStatus along with a cronjob on controls@nodus to generate a webStatus every half hour, at [URL=https://nodus.ligo.caltech.edu:30889/40mWebStatus.html]40mWebStatus[/URL]
you are welcome to add/delete lines corresponding to interesting EPICS channels, in the template /cvs/cds/caltech/scripts/webStatus/webStatus_template.html |
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Mon Jan 5 11:21:05 2009, Alan, Omnistructure, Computer Scripts / Programs, New 40mWebStatus
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[quote]
I guess we need some kind of "official" crontab file for controls@nodus so that we know how/where to add things. So, I put one in /cvs/cds/caltech/crontab/controls@nodus.crontab[/quote]
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Mon Mar 9 10:59:05 2009, Alan, Omnistructure, Computers, ssh agent on fb40m restarted for backup
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After the boot-fest, the nightly backup to Powell-Booth failed, and an automatic email got sent to me. I restarted the ssh agent, following the instructions
in /cvs/cds/caltech/scripts/backup/000README.txt . |
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Fri May 8 10:05:40 2009, Alan, Omnistructure, Computers, Restarted backup since fb40m was rebooted
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| Restarted backup since fb40m was rebooted. |
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Thu Jul 16 09:49:52 2009, Alan, Update, Computers, fb40m
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Quote:
The fb40m just went out of order with status indicator number 8 |
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Sat Aug 15 10:36:02 2009, Alan, HowTo, Computers, nodus boot procedure
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[quote]The restart procedures for the various processes running on nodus are explained here:
http://lhocds.ligo-wa.caltech.edu:8000/40m/Computer_Restart_Procedures#nodus
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Tue Dec 22 13:14:37 2009, Alan, Omnistructure, PEM, miracle in the 40m
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Quote:
We have been waiting for this for 20 some years. Arrowhead water with cooler. AWESOME |
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Fri Jul 30 19:20:15 2010, Alastair, Configuration, General, Jacket
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Quote:
Jenne and I need our jackets. We removed them from the Rb clock. |
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Thu Aug 5 16:18:37 2010, Alastair, Update, General, clocks still not locked fully - hut removed
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The rubidium clocks are still not quite locked together, though it is clear that the beat frequency has dropped a lot since yesterday.
I checked on the clocks and the 1pps sync light is on. The clocks are really hot again though despite the gap left at the bottom of the igloo.
The side of the clocks were hot enough to not be touchable. |
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Wed Aug 18 12:02:29 2010, Alastair, Configuration, Computers, elog had crashed again...
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| ...I restarted it. |
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Thu Aug 19 09:52:51 2010, Alastair, Update, Computers, Elog down
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| I restarted it using start-elog-nodus and this worked out fine - even though I did it from Pete's on my phone ;-) |
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Thu Aug 19 11:38:48 2010, Alastair, Update, Computers, ATF wiki
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| The ATF wiki page doesn't seem to be working any more. Does anyone know where this is held so we can try to get it back online? Thanks |
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Thu Aug 19 12:06:07 2010, Alastair, Update, Computers, ATF wiki
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Quote:
The ATF wiki page doesn't seem to be working any more. Does anyone know where this is held so we can try to get |
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Fri Aug 20 20:36:05 2010, Alastair, Update, General, Elog
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| Elog was down, I restarted it. |
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Tue Aug 24 06:34:01 2010, Alastair, Update, General, Elog...
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| ...was down. Have restarted it. |
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Fri Aug 27 07:21:13 2010, Alastair, Update, General, elog...
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| was down. I restarted the version in the 2.7.5 folder. It went down again almost immediately but stayed up after the second restart. |
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Mon Apr 25 11:23:41 2011, Alastair, Bureaucracy, Computers, wiki?
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40m wiki seems to have been down for quite a while now but I can't see any info in the elog about it. Is there some ongoing problem?
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Mon Apr 25 12:55:35 2011, Alastair, Bureaucracy, Computers, wiki?
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Quote:
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Tue Jun 28 11:25:56 2011, Alastair, Bureaucracy, Computers, restarted elog
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The manual instructions on the 40m wiki for restarting wouldn't work. I killed the process okay, but then I got an error saying it "couldn't
bind to port 8080, please try again using -p to select port". The automated script worked though. |
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Mon Apr 1 16:16:16 2013, Albert, Update, optical tables, Optical Table Toolboxes Update
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A heavy duty plastic box is the likeliest candidate for the optical table toolbox. It measures 5 9/16 in. x 11 5/8 in. x 4 5/8 in. and fits all the tools
comfortably. ( http://www.mcmaster.com/#plastic-bin-boxes/=m4yh4m , under
Heavy Duty Plastic Bin Boxes) |
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Mon Apr 1 16:35:42 2013, Albert, Update, optical tables, Optical Table Toolboxes Update
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Quote:
A heavy duty plastic box is the likeliest candidate for the optical table toolbox. It measures 5 9/16 in. x 11 5/8 in. x 4 5/8 in. and fits |
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Wed Apr 3 19:01:06 2013, Albert, Update, optical tables, Optical Table Toolboxes Update
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Quote:
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Thu Apr 11 16:29:23 2013, Albert, Update, optical tables, Optical Table Toolboxes Update
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Quote:
There are some tips for how to appy nail polish on YouTube from MKNails and MissJenFABULOUS. Their tips on how to prepare the site |
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Mon Apr 15 17:44:28 2013, Albert, Update, optical tables, Optical Table Toolboxes Update
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I decided to go see what the electrical tape looks like on the other tools.
These are the tools I felt were necessary to label with tape: (the others don't seem to be terribly important in terms of not interchanging between
boxes) |
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Mon Apr 29 08:17:40 2013, Albert, Update, optical tables, Optical Table Toolboxes Update
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Quote:
I decided to go see what the electrical tape looks like on the other tools. |
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Mon Apr 29 15:53:49 2013, Albert, Update, optical tables, Optical Table Boxes 7x
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Quote:
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Mon Mar 25 18:58:09 2013, Albert Yang, Update, optical tables, Optical Table Toolboxes
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For those of you who spend annoying amounts of time looking for tools, fear no more. Toolboxes for each optical table are coming!
They will probably have:
IR Viewer (a few optical tables will have IR viewers, these specific tables will be labeled in the diagram coming out later) |
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Wed Nov 28 16:18:15 2007, Alberto, Metaphysics, Environment, so clean you can eat on it
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I tidied up the desks in the lab, brought the Spectrum Analyzers back to the Salumeria (you don't want to know about that), sorted a lot of stuff and boxed
up what I didn't know (you can find it in a couple of carton boxes on the table).
The blackmail with the pie might not work next time.
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Thu Nov 29 18:10:13 2007, Alberto, HowTo, Computer Scripts / Programs, GPIB Scripts
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I've spent a lot of time trying to configurate the GPIB-USB interface for the HP4195. After installing 1) the Agilent libraries, 2) the drivers, 3) the
matlab Instrument Toolbox, 4) Jamie script, 5) Alice's script the computer can see the HP but still they can't 'talk' to each other.
I give up. I asked Alice Wang how she managed to get data. I'm not sure she used the GPIB interace. Rob said she might have used the old fashion floppy |
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Thu Jan 17 18:22:14 2008, Alberto, Update, Electronics, RF Monitor Band-pass Filter
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After we finalized the schematic for the RF monitor board based on buffered LC resonators, on Richard Abbott's suggestion to avoid the complication brought
in by the fast op-amps, we gave another chance to the a passive configuration of the band-pass filter based on a Chebyshev topology. Rich and Ben gave
me an old but very powerful software tool to design that kind of filters and showed me the way to circumvent many hassles in making RF test boards.
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Fri Jan 18 11:53:50 2008, Alberto, Update, Electronics, RF Monitor Band-pass Filter
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The response is asymmetric and on the left side of the peak, we have at least 33dB within 33Mhz, which is enough for all the frequencies. We probably don't
need an higher order filter but just low pass filters in series.
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Fri Jan 25 15:53:59 2008, Alberto, Update, Electronics, 40 dB from the 3rd order Chebyschev
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I managed to tune the 7 knobs in the 3rd order Chebyshev bandpass filter obtaining the tranfer function attached to this entry. We have now 40 dB of attenuation
between 166 Mhz and 133 and 199. With this tuning the insertion loss is rather high. We need a better one.
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Wed Jan 30 11:49:30 2008, Alberto, Summary, Electronics, RF monitor's filters final schematics and transfer functions 8x
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These are the final schematics for the 6th order Chebyshev filters of the RF monitor board. I'm also attaching the TF as I measured. The tuning is probably
not optimal, less insertion noise could be achieved. |
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Wed Feb 13 11:41:00 2008, Alberto, Update, Electronics, Some characterization of the RF Monitor Box (StocMon)
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I'm attaching a table with some measurements and the power spectrum from the pd to help evaluate the numbers.
The box output ranges from 0.5V to 2.1V. The coefficient between power and voltage is negative so higher voltage means lower power.
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Mon Feb 18 12:04:39 2008, Alberto, Update, Electronics, RF Monitor (StocMon)
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I put the amplifiers next to the monitor on the PSL table, layed the power and the RF SMA cables out to the rack. I'm powering the box and the amplifiers
with the power supply, waiting for someone to show me tomorrow how to connect it to the Sorensen (Steve, Ben?).
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Fri Feb 22 08:29:07 2008, Alberto, Update, Electronics, RF Monitor (StocMon)
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[quote]I put the amplifiers next to the monitor on the PSL table, layed the power and the RF SMA cables out to the rack. I'm powering the box and the amplifiers
with the power supply, waiting for someone to show me tomorrow how to connect it to the Sorensen (Steve, Ben?).
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Fri Feb 22 08:33:18 2008, Alberto, Update, Electronics, RF Monitor (StocMon)
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[quote]I put the amplifiers next to the monitor on the PSL table, layed the power and the RF SMA cables out to the rack. I'm powering the box and the amplifiers
with the power supply, waiting for someone to show me tomorrow how to connect it to the Sorensen (Steve, Ben?).
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Thu Jun 19 15:52:06 2008, Alberto, Configuration, Computers, Measure of the current absorbed by the new Megatron Computer
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Together with Rich Abbot, sam Abbot and I measured the current absorbed by the new Megatron computer that we installed yesterday in the 1Y3 rack. The computer
alone absorbs 8.1A at the startup and then goes down to 5.9A at regime. The rest of the rack took 5.2A without the computer so the all rack needs 13.3
at the startup and the 11.1A.
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Mon Jun 23 21:51:19 2008, Alberto, Update, General, Arm Cavity Length Measurement
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We measured the arm cavity lengths sweeping the ETM mirror position and looking at the reflected demodulated output. We excited the mirror by a sine wave
of 0.2 Hz and amplitude of 30000 counts. From the time series of the occurrences of the resonances of the sidebands and of the carrier we evaluated the
free spectral range of the cavities and thus the lengths. The details of the procedure are explained in the attached document. As discussed in it, for |
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Wed Jul 2 06:46:05 2008, Alberto, Configuration, General, NPRO on to warm up
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This morning I turned on the NPRO on the AP table so that it can warm up for a few hours before I start using it today.
The flipping mirror is down so no beam is injected in to the IFO.
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Wed Jul 2 19:15:52 2008, Alberto, Update, General, Status of the alignment of the NPRO beam for the Absolute Length Measurement
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Today I've tried to bring the frequency of the NPRO laser close enough to that of the IFO beam so that the beat between the two beams can be at a detectable
frequency for the photodiode. The way I've been changing the frequency is by the NPRO's temperature control on its driver.
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Thu Jul 3 18:48:09 2008, Alberto, Update, General, Beats of the two lasers in the absolute length measurement observed
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I adjusted the alignment of the flipper mirror as suggested by Koji making the two beam spots match. I also aligned all the IFO mirrors (ITMs, PRM, SRM,
ETMs) to have more power for the IFO signal at the AS port. When I did that I could see the beats at the AS OSA. Then I explored the range of temperature
of the NPRO from 35deg (C) to 51.2807deg and at that point I could observe a peak corresponding to the beat at about 10MHz on the network analyzer. The |
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Mon Jul 7 11:22:02 2008, Alberto, Update, General, Beats of the two lasers in the absolute length measurement observed
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I didn't post a screenshot from the RF SA because I had troubles with the interface with the computer (unfortunately the network SA cannot export the data
either).
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Mon Jul 7 19:15:38 2008, Alberto, Update, General, Optics alignement on the ABS length experiment
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Today I started setting up the PLL instruments to lock the frequency of the NPRO beam to the IFO beam. with no need of a new alignment after the weekend
I was able to see the beat again, although this time I found at a different temperature of the NPRO laser of about 54 degrees (vs 51 of the last time).
I've got the Marconi as local oscillator (LO), the mixer Koji suggetsed, the SR560 and a 5 MHz low pass filter to cut the 33, 66 and 99 MHz present in |
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Thu Jul 10 19:12:07 2008, Alberto, Update, General, abs cavity length measurement experiment
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Yesterday morning, when I started, I found the IFO beam on a different position and the beam spot at the AS port looked very deformed. The overlapping with
the secondary beam was not good enough to observe the beats anymore. Restoring the alignments of the interferometers did not work because, as John found
out later, some of the photodiodes had offsets and gain which made the restore script ineffective. After resetting the parameters, we had to align every |