 Tue Apr 8 09:08:54 2008, steve, Configuration, PEM, weather station disconnected 
|
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.
|
|
Mon Apr 7 18:58:49 2008, steve, Update, General, reflectivity of SS304
|
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 |
|
Mon Apr 7 16:42:56 2008, rana, Update, Computers, eLog intermittent
|
Phil Ehrens restarted Dziban again this morning. Looks like its still crashing each Monday around 8 AM.
Here is the latest suspect:
|
|
Fri Apr 4 16:54:06 2008, Andrey, Summary, Environment, Weather station is fully alive
|
[COLOR=blue]After today's trip to the roof of our building the weather station seems to be completely resurrected![/COLOR]
|
|
Thu Apr 3 19:27:50 2008, Andrey, Summary, Photos, Tour for prospective grad students
|
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 |
|
Thu Apr 3 18:46:04 2008, Andrey, Configuration, Computers, "Network switch board" and "c1pem1 crate" were touched
|
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.
|
|
Thu Apr 3 18:33:17 2008, Andrey, Summary, Environment, Status of Weather Station
|
During the last two days some things related to weather station have been improved.
|
|
Wed Apr 2 15:03:51 2008, steve, Update, General, reflectivity of black glass
|
The reflectivity of black glass, shade 12 was supplied by Donald O'Shea
of Emerald Glass Inc., Westlake, OH 44145
|
|
Fri Mar 28 16:18:18 2008, rob, Update, Computers, c1susvme2 status
|
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. |
 Mon Mar 31 14:14:16 2008, rob, Update, Computers, c1susvme2 status
|
[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]
|
|
Mon Mar 31 14:01:40 2008, jamie, Summary, LSC, Summary of DC readout PD non-linearity measurements
|
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 ---
|
|
Wed Mar 26 22:26:15 2008, John, Update, Computers, c1susvme
|
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. |
|
Wed Mar 26 13:41:53 2008, Andrey, HowTo, SUS, Modification of ''C1DRIFT_MONITOR''
|
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.
|
|
Mon Mar 24 20:15:03 2008, John, Summary, Computers, c1susvme2
|
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 |
|
Tue Mar 25 10:44:24 2008, rob, Update, Computers, c1susvme2
|
[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 |
|
Tue Mar 25 16:34:47 2008, rob, Update, Computers, c1susvme2
|
[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 |
|
Tue Mar 25 15:56:09 2008, John, Update, Treasure, Assorted pictures
|
| Some pictures scavenged from the D40. |
|
Tue Mar 25 13:21:25 2008, Andrey, Update, Computers, c1susvme2 is not behaving itself again
|
| |
|
Mon Mar 24 13:03:54 2008, rob, Update, Electronics, HP4195A is back
|
[quote]The swept sine output looks totally normal from 500Mhz to 150MHz (measuring ~220mVrms below 300MHz -- 0dBm), where it abruptly transitions to a |
|
Sun Mar 23 10:42:54 2008, Valera, Summary, Electronics, RFAM of the RF stabilization box is measured
|
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
|
|
Sun Mar 23 00:56:42 2008, John, Update, LSC, More on 3f
|
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.
|
|
Sun Mar 23 00:43:08 2008, mevans, HowTo, General, Online Adaptive Filtering
|
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. |
|
Sat Mar 22 22:39:02 2008, mevans, Summary, CDS, Direct Form 2 filters are bad
|
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
|
|
Fri Mar 21 23:17:47 2008, rana, Configuration, DMF, seisBLRMS restarted
|
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
|
|
Fri Mar 21 23:15:11 2008, rana, Configuration, PEM, Ranger SS-1: New Setup
|
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.
|
|
Fri Mar 21 17:01:21 2008, rana, Configuration, DMF, Locale change on Mafalda & seisBLRMS restart
|
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.
|
|
Fri Mar 21 09:02:03 2008, steve, Update, VAC, tp 2 failed
|
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.
|
|
Fri Mar 21 11:54:38 2008, rob, Update, VAC, tp 2 failed
|
[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.
|
|
Thu Mar 20 17:45:36 2008, rana, Summary, ASS, Adaptive Filtering in the ASS system
|
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.
|
|
Thu Mar 20 16:06:27 2008, rob, Configuration, LSC, LSC code change
|
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 |
|
Thu Mar 20 15:28:20 2008, steve, Update, VAC, tp2 's drypump replaced
|
| The fore pump of tp2 was replaced at fore line pressure 998m Torr |
|
Tue Mar 11 23:14:01 2008, rana, Configuration, PEM, Accelerometer and Seismometer movements
|
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.
|
|
Wed Mar 12 00:36:52 2008, rana, Configuration, PEM, Accelerometer and Seismometer movements
|
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
|
|
Wed Mar 12 00:40:35 2008, rana, Configuration, PEM, Accelerometer and Seismometer movements
|
| Same as above but with 2048 taps and a 128 Hz sample rate. Does much better at the 16 Hz bounce mode. |
|
Wed Mar 12 00:47:26 2008, rana, Configuration, PEM, Accelerometer and Seismometer movements
|
| 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] |
|
Mon Mar 17 18:30:48 2008, mevans, Configuration, PEM, Adaptive Filtering
|
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. |
|
Sun Mar 16 17:03:32 2008, rob, Configuration, CDS, ASS code change
|
I've updated the ass.mdl file in the directory:
|
|
Fri Mar 14 16:56:03 2008, Dmass, Bureaucracy, Computers, New 40m control machine.
|
I priced out a new control machine from Dell and had Steve buy it.
GigE cards (jumbo packet capable) will be coming seperately.
|
|
Fri Mar 14 15:52:07 2008, rob, Configuration, LSC, LSC code change
|
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 |
|
Thu Mar 13 12:11:58 2008, aivanov, Update, Computer Scripts / Programs, routing PEM -> ASS -> SUS_MCL
|
on ASS RFM 1 has PEM signals at
|
|
Fri Mar 14 15:06:24 2008, rob, Update, Computer Scripts / Programs, routing PEM -> ASS -> SUS_MCL
|
[quote]
on ASS RFM 1 has PEM signals at
|
|
Fri Mar 14 14:59:51 2008, josephb, Configuration, Cameras, Comparison between GC650 (CCD) and GC750 (CMOS) looking at ETMX
|
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 |
|
Fri Mar 14 12:06:29 2008, josephb, Configuration, Cameras, GC750 looking at ETMX while locked
|
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.
|
|
Thu Mar 13 18:20:29 2008, John, Update, General, New Focus 4003 EOM 29.489MHz
|
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] |
|
Thu Mar 13 13:15:09 2008, aivanov, Update, Computer Scripts / Programs, new sfotware intall, backup files
|
New:
op440m:40m>ls -alt /cvs/cds/caltech/target/c1susvme[12]/*.o
-rw-r--r-- 1 controls staff 57920 2008-03-13 13:11 /cvs/cds/caltech/target/c1susvme2/losLinux2.o
|
|
Thu Mar 13 03:07:19 2008, Lisa, Metaphysics, Environment, Coolness at the 40m
|
My first (and hopefully not last) week at the [COLOR=orange]40m lab[/COLOR] is ending :(
I found this lab really [COLOR=red]cool[/COLOR], the people working here really [SIZE=2][COLOR=red]cool[/COLOR][/SIZE] as well, and this e-log....
this e-log is not just [SIZE=4][COLOR=red]cool[/COLOR][/SIZE], it is [SIZE=5][COLOR=green][FONT=Comic Sans MS]FANTASTIC!!![/FONT][/COLOR][/SIZE]
|
|
Wed Mar 12 23:05:44 2008, rana, Update, IOO, MC WFS
|
they are bad, somewhat
please fix |
|
Mon Mar 10 20:46:41 2008, John, Configuration, LSC, ETMY Trans PD & QPD
|
| I've placed a 10% reflector in the path from ETMY to the trans and quadrant photodiodes. |
|
Mon Mar 10 02:05:08 2008, rob, Update, Locking, DRMI+2ARMs working better
|
Some encouraging progress on the locking front tonight. After the work on the DRM loops last week and a review of the settings for initial lock acquisition
(loop gains, tickle amplitude, filter states, so on), the DRMI+2ARMS locking is working pretty well. That's to say, it takes from 5-15 minutes generally |
|
Fri Mar 7 19:04:39 2008, steve, Omnistructure, PSL, laser pointer
|
Green laser pointer was found in my desk.
I blamed Rana for not returning it to me after a conference talk.
It is surprisingly bright still.
|
|
Fri Mar 7 17:10:01 2008, Max Jones, Update, Computers, Noise Budget work
|
Noise budget has been moved to the svn system. A checked out copy is in the directory caltech. From now on, I will try to use the work cycle as outlined
in the svn manual. Changes made today include the following:
getNoiseBudget
|
|
Fri Mar 7 00:47:54 2008, rana, Configuration, PEM, Ranger SS-1
|
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.
|
|
Thu Mar 6 00:17:37 2008, rob, Update, Locking, DD handoff working
|
Got the DD (double demod) handoff scripts working tonight, with just the DRMI. So, now acquisition with the single demod signals is working well, and handoffs
to all double demod signals using the input matrix ramping worked several times with the scripts. Up next will be more work with the DRM+ARMs. |
|
Wed Mar 5 17:35:24 2008, rana, Update, IOO, RFAM during MC lock
|
I used an ezcaservo command to adjust the offsets for Alberto's StochMon channels. They [B][COLOR=green]are all
at +2 V with no light[/COLOR][/B] on the RFAM PD (MC unlocked).
|
|
Wed Mar 5 12:51:48 2008, John, Summary, LSC, Initial Ligo Arm finesse versus lambda
|
I've taken the coating recipes for the initial ligo arm cavity from Rana's web page (ligo.caltech/edu/~rana/mat/)
and plotted the finesse as a function of wavelength. There is some uncertainty over the indices of refraction but
the main conclusion remains unchanged - i.e. it appears that using other wavelengths will be difficult.
|
|
Wed Mar 5 12:35:09 2008, John, Summary, Computer Scripts / Programs, Plot photodiode responses in MatLab
|
A matlab function to plot the responses of photodiodes. There's still plenty of room for improvement but it should work for all our diodes without any changes.
You may want to adjust which points are used in the fit to remove time delay.[IMG]elog:359/1[/IMG]
|
|
Tue Mar 4 23:22:32 2008, rob, DAQ, Computers, c1susvme1&2 rebooted
|
I found that some channels from c1susvme1 and c1susvme2 were not being recording by the DAQ (and were not showing up in DV). I rebooted these processors,
which fix the problem. If you see other cases of this (signal exactly zero, but not a testpoint problem), just reboot the corresponding processor. |
|
Tue Mar 4 20:14:02 2008, rana, Configuration, IOO, MC Alignment
|
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
|
|
Tue Mar 4 19:14:09 2008, rana, Configuration, CDS, TDS & SVN
|
[COLOR=purple][I]Matt, Rob, Rana[/I][/COLOR]
[B][COLOR=chocolate]Today we added the TDS software to the 40m SVN repo.[/COLOR][/B]
|