 Tue Mar 4 19:14:09 2008, rana, Configuration, CDS, TDS & SVN
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[COLOR=purple][I]Matt, Rob, Rana[/I][/COLOR]
[B][COLOR=chocolate]Today we added the TDS software to the 40m SVN repo.[/COLOR][/B]
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Tue Mar 4 20:14:02 2008, rana, Configuration, IOO, MC Alignment
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The MC alignment was pretty far off. We were getting TEM01 mode locks only.
Rather than inspect what happened I just aligned the MC suspensions to get
the transmission higher. Now Matt should be able to lock the X arm and collect
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Fri Mar 7 00:47:54 2008, rana, Configuration, PEM, Ranger SS-1 
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Yesterday evening around 7:30 PM, I changed the Ranger seismometer from a
vertical to a horizontal seismometer. To do this I followed the instructions
in the manual.
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Mon Mar 10 20:46:41 2008, John, Configuration, LSC, ETMY Trans PD & QPD
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| I've placed a 10% reflector in the path from ETMY to the trans and quadrant photodiodes. |
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Tue Mar 11 23:14:01 2008, rana, Configuration, PEM, Accelerometer and Seismometer movements
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Steve and Matt moved the accelerometers and seismometers today.
The accelerometers are now placed around the MC and the seismometer is in-between MC1 & MC2.
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 Wed Mar 12 00:36:52 2008, rana, Configuration, PEM, Accelerometer and Seismometer movements
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I used the MISO FIR Wiener matlab code to see how well we might do in principle.
The attached 3 page PDF file shows the MC_L control signal (force on MC2) and the residual
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Wed Mar 12 00:40:35 2008, rana, Configuration, PEM, Accelerometer and Seismometer movements
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| Same as above but with 2048 taps and a 128 Hz sample rate. Does much better at the 16 Hz bounce mode. |
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Wed Mar 12 00:47:26 2008, rana, Configuration, PEM, Accelerometer and Seismometer movements
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| And this is a [COLOR=blue]cool snapshot[/COLOR] showing how this operation used [B][COLOR=red]16 cores[/COLOR][/B] on [SIZE=5][B][COLOR=purple]menkar ![/COLOR][/B][/SIZE] |
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Thu Mar 13 02:52:06 2008, Lisa, Configuration, LSC, Locking with 3f
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Today we have tried to use the reflected signal demodulated at 3*f1 ~ 99 MHz ([COLOR=chocolate][B]REFL31[/B][/COLOR]) for length control.
This signal is cool because it is generated by the beating of sidebands, so it is not very sensitive to what the carrier does inside the IFO.
In particular, its gain and the demodulation phase shouldn't change much while changing the CARM offset during the locking sequence.
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Fri Mar 14 12:06:29 2008, josephb, Configuration, Cameras, GC750 looking at ETMX while locked
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The GC750 (CMOS) is currently looking at the front of ETMX. Unfortunately, its being routed through a 10Mbit connection (which I will be purchasing a replacement
for today), so getting it to send images to Mafalda/Linux 2 or 3 isn't working well, but by using a local gigabit switch and a laptop I can get sufficient
speed for full images with the sample viewer.
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Fri Mar 14 14:59:51 2008, josephb, Configuration, Cameras, Comparison between GC650 (CCD) and GC750 (CMOS) looking at ETMX
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Attached are images taken of ETMX while locked.
The first two are 300,000 microsecond exposure time, with approximately the same focusing/zoom. (The 750 is slightly more zoomed in than the 650 in these |
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Fri Mar 14 15:52:07 2008, rob, Configuration, LSC, LSC code change
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I've edited the LSC code to send different signals to the ASS box. Now, instead of the previously selected error signals deemed to be acceptable for the
Alignment Sensing and Stabalization system, it sends the LSC control signals for each suspension to the ASS box (in its new incarnation as the Adaptive |
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Sun Mar 16 17:03:32 2008, rob, Configuration, CDS, ASS code change
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I've updated the ass.mdl file in the directory:
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Mon Mar 17 18:30:48 2008, mevans, Configuration, PEM, Adaptive Filtering
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It seems that adaptive filtering can achieve results similar to those of the MISO FIR Wiener (entry 369). The adaptive code simulates real-time operation,
but uses the same data used by Rana for the Wiener filter. I ran the adaptive filter over the data 100 times to ensure that it was well trained... maybe
too well. |
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Thu Mar 20 16:06:27 2008, rob, Configuration, LSC, LSC code change
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I changed the LSC code again. I noticed that when turning off the LSC (e.g., going from LA to OFF), the cpu time would jump from ~50 to ~80, and irrevocably
de-sync all the SUS controllers. This was because turning off the LSC would suddenly zero the inputs to the decimation filters that send information to |
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Fri Mar 21 17:01:21 2008, rana, Configuration, DMF, Locale change on Mafalda & seisBLRMS restart
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Ever since we moved the accelerometers to be around the MC and changed their names, the seisBLRMS
has not been working. I tried to restart it today after fixing the channel names in the par file
but I ran into a PERL / UBUNTU bug.
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Fri Mar 21 23:15:11 2008, rana, Configuration, PEM, Ranger SS-1: New Setup
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The Ranger seismometer has been in a bad state. Its output had been sent into a SR560 without any termination.
The seismometer is, internally, just a mass on a flexure with a magnet and a pickup coil for readout.
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Fri Mar 21 23:17:47 2008, rana, Configuration, DMF, seisBLRMS restarted
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I updated the seisBLRMS par file with the new channel names of the accelerometers and the seismometer and then
recompiled the code and restarted it according to Rob's elog entry. It went fine and the [SIZE=4][COLOR=chocolate][FONT=Comic Sans MS]seisBLRMS is now
back in
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Thu Apr 3 18:46:04 2008, Andrey, Configuration, Computers, "Network switch board" and "c1pem1 crate" were touched
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While working with the weather station, I did two things that potentially (with a very small probability) might influence the smooth work of other processors/computers.
I did the following on Wednesday, April 2nd, in times between 1PM and 3PM.
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Tue Apr 8 09:08:54 2008, steve, Configuration, PEM, weather station disconnected
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We can not leave cables in the walkways and go on vacation.
I disconnected the weather station from the DAQ
Every Tuesday is janitor day in the 40m.
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Tue Apr 15 18:44:25 2008, rana, Configuration, Computers, Rosalba
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There is a new computer in the control room -- its called [B][COLOR=purple]Rosalba[/COLOR][/B],
in keeping with our naming convention. Its a quad-core machine that
Dmass found for cheap somewhere; we've installed the CentOS on it
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Tue Apr 22 08:34:22 2008, josephb, Configuration, Cameras, Current Network Diagram
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| The attached network diagram has also been added to the 40m Wiki at http://lhocds.ligo-wa.caltech.edu:8000/40m/Image_Processing_with_GigE_Cameras |
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Tue Apr 22 22:51:30 2008, rana, Configuration, IOO, McWFS Status
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I've been working a little on the MC WFS in the last few days. I have made many
changes to the sensing matrix script and also to the MCWFSanalyze.m script.
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Thu Apr 24 15:57:53 2008, steve, Configuration, SAFETY, Safety at AP-ISCT
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I measured the output power of the psl after the mechanical shutter.
It was 1.1 W with Ophir power meter, than unlocked the MC and measured
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Fri Apr 25 11:33:40 2008, Andrey, Configuration, Computers, Computer controlling vaccum equipment
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[COLOR=blue]Old computer[/COLOR] (located in the south-end end of the interferometer room) that was almost unable to fulfill his duties of controlling
vacuum equipment [COLOR=blue]has been replaced to "Linux-3"[/COLOR]. MEDM runs on "Linux-3".
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Fri Apr 25 20:53:02 2008, rana, Configuration, IOO, MC WFS with more gain
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Quick update: we found that the reason for the MC WFS instability was that the digital anti-whitening was one but not the analog whitening.
We turned off the digital filters and were able to increase the gain by a factor of ~30. It is left like this, but if it hampers IFO locking then best |
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Sun Apr 27 02:11:11 2008, rana, Configuration, IOO, MC WFS Notes
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As noted in the elog from Friday, the WFS has been bad ever since someone switched on the digital whitening filters (FM1 & FM2)
in the MC WFS I&Q filter banks.
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Sun Apr 27 05:09:30 2008, rana, Configuration, IOO, MC WFS Whitening turned on
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I [B]hardwired on the MC WFS whitening[/B] filters.
The MAX333A switches which choose between whitening and bypass on that board were in the bypass position
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Thu May 1 12:46:02 2008, josephb, Configuration, Computers, Nodus gateway is up
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The computer Nodus is now acting as a gateway machine between the GC network and the martian network in the 40m. It has the same passwords as the rana
gateway machine.
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Tue May 6 17:28:39 2008, rob, Configuration, LSC, AP33 -> POX33
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I am in the process of switching the POX166 and AP33 photodetectors, so that they become POX33 and AP166. The IFO_CONFIGURE buttons won't work until I
finish. |
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Wed May 7 15:25:41 2008, rob, Configuration, LSC, AP33 -> POX33
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[quote]
I am in the process of switching the POX166 and AP33 photodetectors, so that they become POX33 and AP166. The IFO_CONFIGURE buttons won't work until I
finish.[/quote]
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Thu May 8 16:40:36 2008, josephb, Configuration, Cameras, Gige Camera currently on PSL table
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Andrey and myself were working on the PSL table today, using a pickoff of a pickoff of the main beam (adding a microscope slide to pickoff ~4% of the original
pickoff) to the GC750 GigeCam.
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Thu May 15 12:05:49 2008, josephb, Configuration, PSL, Path to PSL Position QPD
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The 50/50 beamsplitter that was being used as the last turning mirror to the PSL Position QPD has been replaced with a Y1-1037-45-S plate. This turning
mirror was also moved 4" farther along the beam path, so as to produce as small (few microwatts) transmission through the plate. The lensing optics were
also shifted so as to maintain a focused beam on the photodiode. Lastly, the rotating ND filter was increased from 1.5 to 2.0 to reduce the incident power |
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Sun May 18 18:59:15 2008, rana, Configuration, Computers, cron and hosts
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I added rosalba to the hosts file for the control room machines (131.215.113.103).
I also removed the updateddb cron from our op440m crontab because it was running at 5 PM
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Tue May 20 18:33:01 2008, Andrey, John, Configuration, IOO, Mode Cleaner is locked again
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It was noticed by Mr.Adhikari earlier today that the MC became unlocked at about 11AM.
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Thu May 22 11:25:19 2008, josephb, Configuration, Computers,
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One of the new Netgear Prosafe 24 port switches was mounted in the 1X4 rack,, roughly in the middle, away from the top and bottom rack mounted electronics.
At the moment, its IP has been set to 131.215.113.250, gateway 131.215.113.2 (which is what I saw as the only listed gateway on linux1 using route -n)
and mask 255.255.255.0.
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Sun May 25 16:20:27 2008, rana, Configuration, Computers, joinPDF
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I have installed joinPDF 2.1 on rosalba. Since its written in Java, I didn't have to tinker with it at all to work on a 64-bit machine. Now Caryn can put
all of her plots into 1 file. |
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Sun May 25 21:14:14 2008, tobin, Configuration, Computers, EPICS proxy server
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I set up an EPICS gateway server on Nodus so that we can look at 40m MEDM screens from off-site.
The gateway is set up to allow read access to all channels and write access to none of them.
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Tue May 27 16:24:54 2008, tobin, Configuration, Computer Scripts / Programs, ndsproxy
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The NDS Proxy is a program that accepts NDS (LIGO Network Data Server) connections from the internet and relays them to
our internal frame-builder, so that you can get DAQ and test-point channel data from off-site.
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Wed May 28 12:51:32 2008, josephb, Configuration, Computers, Two more switches mounted
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Two more Prosafe 24 port switches have been mounted in the racks, one in 1Y9 and one in 1Y6. (The first one was placed in 1X4).
The one in 1Y9 has been set to an IP address of 131.215.113.251, while the one in 1Y6 is set to 131.215.113.252, and these have been labeled as such. |
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Fri May 30 12:03:08 2008, josephb, Andrey, Configuration, Cameras, Head to head comparison of cameras
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Andrey and myself - Joseph B. - have examined the output of the GC650 (CCD) and GC750 (CMOS) prosilica cameras. We did several live motion tests (i.e.
rotate the turning mirror, move and rotate the camera, etc) and also used a microscope slide to try to eliminate back reflections and interference.
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Fri May 30 21:30:15 2008, tobin, Configuration, Computers, svn on solaris
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I installed svn on op440m. This involved installing the following packages from sunfreeware:
apache-2.2.6-sol9-sparc-local libiconv-1.11-sol9-sparc-local subversion-1.4.5-sol9-sparc-local
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Sun Jun 1 19:25:10 2008, rana, Configuration, Computers, new monitor on op440m
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I installed the new 24" flat screen on op440m. I increased the screen resolution from 1280x1024 to 1900x1200 using
the obscure 'fbconfig' command. You can type Google it if you want.
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Sun Jun 1 19:39:35 2008, tobin, Configuration, Computers, elog, etc
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Phil Ehrens gave me a DVD of the 40m elog, apache, and (Jamie's) SVN archive.
I copied it to nodus:/home/controls/dvd-from-ehrens. Once we get the elog
running on nodus, we can copy the datafile over again from dziban (so that
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Tue Jun 3 10:19:45 2008, tobin, Configuration, Computers, big machine
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Several of us transported the big new awesome Sun box from Bridge over to
the 40m last week. If I recall correctly, it's a [url=http://sun.systemnews.com/articles/101/3/server/16468]SunFire X4600[/url] with
something like sixteen 64-bit AMD processor cores at 2.8 GHz. It sounds
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Tue Jun 3 10:40:27 2008, tobin, Configuration, Computers, new dataviewer
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Alex let me know the secret location of the latest dataviewer executable for Linux. It is:
http://www.ligo.caltech.edu/~aivanov/upload/dv/Control/dc3
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Wed Jun 4 13:46:42 2008, josephb, Configuration, Cameras, Changing incident angle images
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Attached are images from the GC650 and GC750 when the incident angle was varied from 0 tilt (normal incidence) to 5,10, and 20 degrees. Each time the beam
was realigned via the last turning mirror to be on roughly the same spot. This light was a pickoff of the PSL table light just before it leaves the table.
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Wed Jun 4 16:57:12 2008, josephb, Configuration, Cameras, Dark images from cameras (electronics noise measurement)
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The attached pdfs are 1 second and 1 millisecond long integrations from the GC650 and GC750 cameras with a cap in place - i.e. no light.
They include the mean and standard deviation values.
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Thu Jun 5 10:46:26 2008, josephb, Configuration, Cameras, Approximately uniform reflected white light
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In an attempt to investigate the structures seen in previous images for the GC750, I aimed it at a relatively clean section of gray table top roughly a
cm or two from the surface and took images (without a lens). As I was holding this with my hand, the angle wasn't completely even with the table, and
thus there's a gradient of light in the pictures. However, one should in principle be able to pick out features (such as a circular spot with less sensitivity), |
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Thu Jun 5 13:35:23 2008, josephb, Configuration, Cameras, GC750 looking at 1064nm scattered light
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I've taken 200 images of the GC750 (CMOS) camera while holding it by hand up to a beam card (also held by hand) in the path of ~5mW of beam power. I then
averaged the images to produce the fourth attached plot.
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