 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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Tue Apr 22 22:19:02 2008, rob, Metaphysics, lore, jiggling sliders
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In the interests of tacit communication of scientific knowledge, I here reveal a nugget of knowledge which may or may not prove useful to new LIGOites:
sometimes when front-end machines are rebooted, the hardware they control can wind up in a state which is not accurately represented by the EPICS values |
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Tue Apr 22 17:08:04 2008, Caryn, Update, IOO, no signal for C1:IOO-MC_L
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| C1:IOO-MC_L signal was at zero for the past few days |
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Fri Apr 18 16:02:58 2008, alex, Update, SUS, end station sus front-end bug fix
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| installed and started new susEtmx.o and susEtmy.o to fix a problem with ETMY optical lever variables. |
 Fri Apr 18 16:27:04 2008, rob, Update, SUS, end station sus front-end bug fix
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[quote]installed and started new susEtmx.o and susEtmy.o to fix a problem with ETMY optical lever variables.[/quote]
But where is the code? |
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Tue Apr 22 16:17:48 2008, rob, Update, SUS, end station sus front-end bug fix
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[quote]installed and started new susEtmx.o and susEtmy.o to fix a problem with ETMY optical lever variables.[/quote]
What Alex means is that the EPICS values for the ETMY optical levers were being clobbered in the RFM. The calculations were being done correctly in the |
Sun Apr 20 23:39:57 2008, rana, Summary, SUS, MC1 electronics busted 
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I spent some time trying to fix the utter programming fiasco which was our MCWFS diagonalization script.
However, it still didn't work. Loops unstable. Using the matrix in the screen snapshot is OK, however.
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Tue Apr 22 10:59:24 2008, rob, Update, SUS, MC1 electronics busted
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[quote]I spent some time trying to fix the utter programming fiasco which was our MCWFS diagonalization script.
However, it still didn't work. Loops unstable. Using the matrix in the screen snapshot is OK, however.
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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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Sun Apr 20 20:29:46 2008, rana, Update, Computer Scripts / Programs, tdsread bugs
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[COLOR=darkred]There seems to be a problem with reading the C1:IOO-MASTER_OVERFLOW field
when it is read in as part of an array. The only way for me to describe it
is to just attach the terminal output in this entry...this is mainly [B]for
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Mon Apr 21 13:12:21 2008, rob, Update, Computer Scripts / Programs, tdsread bugs
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[quote][COLOR=darkred]There seems to be a problem with reading the C1:IOO-MASTER_OVERFLOW field
when it is read in as part of an array. The only way for me to describe it
is to just attach the terminal output in this entry...this is mainly [B]for
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Fri Apr 18 19:46:08 2008, rana, Update, ASS, check adaptive
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I restarted the adaptive code today using 'startass' and 'upass'.
I moved them into the scripts/ASS/ subdirectory.
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Mon Apr 21 12:58:42 2008, rob, Update, ASS, check adaptive
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[quote]
Caryn Palatchi (a Caltech undergrad who just started working with us)
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Sun Apr 20 18:23:27 2008, rana, Summary, LSC, locking attempts
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I noticed that the adaptive FF for the MC had stopped doing anything; this turned out
to be that the MC lost lock and the mcdown script turned off the FF path to MC1.
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Fri Apr 18 16:48:13 2008, Andrey, Update, PEM, Rain collector of weather station
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Today the rain collector of our weather station was cleaned. As a result, we checked that the rain indication on the weather monitor and on the MEDM screens
is alive and working properly. I am adding some details about the roof sensors to the wiki-40 page about the weather station. See especially the link "More |
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Thu Apr 17 20:17:37 2008, Andrey, Update, PEM, Two issues with our weather station
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I encountered two difficulties working with the "Weather Station".
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Thu Apr 17 15:00:59 2008, steve, Update, VAC, vac controller computer to be replaced
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Now that Rosalba is up and running someone should step forward to volunteer for this job.
Old desk top at the Vacuum Rack should be replaced by a functional less old computer so
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Wed Apr 16 21:11:12 2008, rana, Summary, DAQ, AA/AI Filters for the DAQ & FE systems
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I used Foton to make up some new filters which will be used all over the project in order to downsample/upsample.
There will be 2 flavors:
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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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Wed Apr 16 10:20:01 2008, Andrey, Update, Computers, Rosalba and linux3
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[quote]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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Wed Apr 16 09:47:35 2008, Andrey, Summary, PEM, Weather Station
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The weather station is functional again.
The long ethernet Cat5 cable connecting 'WeatherLink' and processor 'c1pem1' was repaired yesterday, namely the RJ45 connector was replaced,
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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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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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Mon Apr 7 16:42:56 2008, rana, Update, Computers, eLog intermittent
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Phil Ehrens restarted Dziban again this morning. Looks like its still crashing each Monday around 8 AM.
Here is the latest suspect:
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Fri Apr 4 16:54:06 2008, Andrey, Summary, Environment, Weather station is fully alive
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[COLOR=blue]After today's trip to the roof of our building the weather station seems to be completely resurrected![/COLOR]
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Thu Apr 3 19:27:50 2008, Andrey, Summary, Photos, Tour for prospective grad students
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Last Friday (March 28), there was a tour of 40-meter lab for prospective graduate students.
Rana showed to the prospective students the interferometer. See pdf-attachment with pictures (two pictures of Rana with undergraduates (I took them) and |
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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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Thu Apr 3 18:33:17 2008, Andrey, Summary, Environment, Status of Weather Station
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During the last two days some things related to weather station have been improved.
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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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Fri Mar 28 16:18:18 2008, rob, Update, Computers, c1susvme2 status
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c1susvme2 is getting worse and worse. it won't run for more than ~45 minutes without fatally de-syncing. for now I've turned off c1iovme (which sends
the MCL signal) to see if that's causing the problem. next I'll swap the boards for c1susvme1 and c1susvme2 to see if it's the cpu (or maybe the RFM card)
itself, rather than the timing/pentek systems. |
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Mon Mar 31 14:14:16 2008, rob, Update, Computers, c1susvme2 status
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[quote]c1susvme2 is getting worse and worse. it won't run for more than ~45 minutes without fatally de-syncing. for now I've turned off c1iovme (which
sends the MCL signal) to see if that's causing the problem. next I'll swap the boards for c1susvme1 and c1susvme2 to see if it's the cpu (or maybe the
RFM card) itself, rather than the timing/pentek systems.[/quote]
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Mon Mar 31 14:01:40 2008, jamie, Summary, LSC, Summary of DC readout PD non-linearity measurements
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From March 21-26, I conducted some measurements of the response non-linearity of some mock-up DC readout photodetectors. The detectors are simple:
[CODE]
Vbias ---
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Wed Mar 26 22:26:15 2008, John, Update, Computers, c1susvme
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I removed the fan and tweaked the timing cables to see if they were the source of our problems. I saw no effect. I'm leaving the fan off for the moment
to see if that helps. It is on top of the filing cabinet next to my desk. |
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Wed Mar 26 13:41:53 2008, Andrey, HowTo, SUS, Modification of ''C1DRIFT_MONITOR''
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I learned how to modify the drift-monitor in MEDM so that values on it change colors from green to yellow to red depending how much is the fluctuatioin
(deviation) of the value from its mean nominal value.
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Mon Mar 24 20:15:03 2008, John, Summary, Computers, c1susvme2
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c1susvme2 isn't behaving itself. It keeps getting out of sync and/or giving a red status light.
After going through the usual restart procedures a few times (unsuccessfully) we power cycled the c1susvme & c1sosvme crates. We think everything came |
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Tue Mar 25 10:44:24 2008, rob, Update, Computers, c1susvme2
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[quote]c1susvme2 isn't behaving itself. It keeps getting out of sync and/or giving a red status light.
After going through the usual restart procedures a few times (unsuccessfully) we power cycled the c1susvme & c1sosvme crates. We think everything came |
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Tue Mar 25 16:34:47 2008, rob, Update, Computers, c1susvme2
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[quote][quote]c1susvme2 isn't behaving itself. It keeps getting out of sync and/or giving a red status light.
After going through the usual restart procedures a few times (unsuccessfully) we power cycled the c1susvme & c1sosvme crates. We think everything came |
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Tue Mar 25 15:56:09 2008, John, Update, Treasure, Assorted pictures
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| Some pictures scavenged from the D40. |
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Tue Mar 25 13:21:25 2008, Andrey, Update, Computers, c1susvme2 is not behaving itself again
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Mon Mar 24 13:03:54 2008, rob, Update, Electronics, HP4195A is back
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[quote]The swept sine output looks totally normal from 500Mhz to 150MHz (measuring ~220mVrms below 300MHz -- 0dBm), where it abruptly transitions to a |
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Sun Mar 23 10:42:54 2008, Valera, Summary, Electronics, RFAM of the RF stabilization box is measured
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I reconstructed Tobin's setup to measure the RFAM after the RF stabilization box in the 166 MHz modulation path.
The setup consisted of the splitter and the mixer followed by the RF low pass filter and the SR560 (gain x100).
The RF level into splitter was 20 dBm. The Mini-Circuits ZLW-3H (17 dBm LO) mixer was used. The LO was taken
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Sun Mar 23 00:56:42 2008, John, Update, LSC, More on 3f
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We ended our last attempt at 3f locking concerned about the beam size on PD6. I investigated tonight. The beam was not obviously overfilling the diode and
a quick tweak of the steering mirror revealed a decent plateaux. Nevertheless we decided to try a different approach to see if we found the same problems
as before on a different diode.
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Sun Mar 23 00:43:08 2008, mevans, HowTo, General, Online Adaptive Filtering
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I wrote a short document about the OAF running on the ASS. Since there is no BURT setup, I put a script in /cvs/cds/caltech/scripts to help with setting
initial parameters: upass. |
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Sat Mar 22 22:39:02 2008, mevans, Summary, CDS, Direct Form 2 filters are bad
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Here I show a comparison between the filter algorithm currently used in LIGO (Direct Form II), and an alternative algorithm designed to reduce numerical
noise. The input signal is
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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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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 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 09:02:03 2008, steve, Update, VAC, tp 2 failed
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Small turbo #2 is the forepump of the maglev.
It failed last night, shut down the maglev and interlock closed V1
Ifo pressure is 20 mTorr now. The Yarm was still locked at 8am this morning.
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Fri Mar 21 11:54:38 2008, rob, Update, VAC, tp 2 failed
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[quote]Small turbo #2 is the forepump of the maglev.
It failed last night, shut down the maglev and interlock closed V1
Ifo pressure is 20 mTorr now. The Yarm was still locked at 8am this morning.
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Thu Mar 20 17:45:36 2008, rana, Summary, ASS, Adaptive Filtering in the ASS system
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Over the past couple weeks we (Matt, Alex, Rob, me) have worked on getting an adaptive filter
system working. We wanted to load this system into c1ass to use this processor. The dither alignment
system hasn't been employed here for awhile and so we have just used this box.
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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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Thu Mar 20 15:28:20 2008, steve, Update, VAC, tp2 's drypump replaced
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| The fore pump of tp2 was replaced at fore line pressure 998m Torr |
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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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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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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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Fri Mar 14 16:56:03 2008, Dmass, Bureaucracy, Computers, New 40m control machine.
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I priced out a new control machine from Dell and had Steve buy it.
GigE cards (jumbo packet capable) will be coming seperately.
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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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Thu Mar 13 12:11:58 2008, aivanov, Update, Computer Scripts / Programs, routing PEM -> ASS -> SUS_MCL
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on ASS RFM 1 has PEM signals at
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Fri Mar 14 15:06:24 2008, rob, Update, Computer Scripts / Programs, routing PEM -> ASS -> SUS_MCL
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[quote]
on ASS RFM 1 has PEM signals at
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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 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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Thu Mar 13 18:20:29 2008, John, Update, General, New Focus 4003 EOM 29.489MHz
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I measured the modulation index as a function of drive power using an OSA. Agrees well with spec of 0.2 rad/V.
[IMG]elog:377/1[/IMG] |