 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] |
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Thu Mar 13 13:15:09 2008, aivanov, Update, Computer Scripts / Programs, new sfotware intall, backup files
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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
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Thu Mar 13 03:07:19 2008, Lisa, Metaphysics, Environment, Coolness at the 40m
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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]
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Wed Mar 12 23:05:44 2008, rana, Update, IOO, MC WFS
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they are bad, somewhat
please fix |
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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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Mon Mar 10 02:05:08 2008, rob, Update, Locking, DRMI+2ARMs working better
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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 |
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Fri Mar 7 19:04:39 2008, steve, Omnistructure, PSL, laser pointer
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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.
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Fri Mar 7 17:10:01 2008, Max Jones, Update, Computers, Noise Budget work
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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
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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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Thu Mar 6 00:17:37 2008, rob, Update, Locking, DD handoff working
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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. |
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Wed Mar 5 17:35:24 2008, rana, Update, IOO, RFAM during MC lock
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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).
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Wed Mar 5 12:51:48 2008, John, Summary, LSC, Initial Ligo Arm finesse versus lambda
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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.
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Wed Mar 5 12:35:09 2008, John, Summary, Computer Scripts / Programs, Plot photodiode responses in MatLab
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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]
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Tue Mar 4 23:22:32 2008, rob, DAQ, Computers, c1susvme1&2 rebooted
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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. |
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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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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 10:08:21 2008, rob, Update, Computers, green lights unreliable when c0daqctrl down
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So far I've tried powering off the framebuilder, power-cycling the RAID (it was showing an error message about bad IDE channel #4), and rebooting the LSC
(just for fun). When I reset the LSC, its green light on the RFM_NETWORK screen did not turn red, making all these lights suspect. The [B]iscepics40m[/B] |
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Tue Mar 4 00:42:51 2008, rana, Update, Computers, FB0 still down ?
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The framebuilder is still down. I tried restarting the daqd task and resetting the RFM
switch like it says in the Wiki but it still doesn't work right. The computer itself is
running (I can ssh to it) and the daqd process is running but there's a red light for
|
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Mon Mar 3 13:58:10 2008, steve, Update, Computers, RFM Network are down
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| The CODAQ_RFNETWORK are down, except C1SUSVME & AWG |
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Mon Mar 3 19:34:40 2008, rana, Update, Computers, RFM Network are down
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[quote]The CODAQ_RFNETWORK are down, except C1SUSVME & AWG[/quote]
All of the FE machines were found to be down this afternoon. I called Alex and he suggested several
things which didn't work (restart EPICS tasks, power cycle RFM switch, etc.).
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Tue Feb 19 10:14:13 2008, steve, Update, VAC, rga logging needs help
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| The rga head and controller are running fine, but the data logging is not. |
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Thu Feb 28 13:04:59 2008, rob, Update, VAC, rga logging working again
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[quote]The rga head and controller are running fine, but the data logging is not.[/quote]
It should run tonight at 1:25 AM. To get the cron job to work properly on op340m, I had to make wrapper sh script which defines the perl library before |
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Mon Mar 3 09:25:33 2008, steve, Update, VAC, rga scan logging is working now
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[quote][quote]The rga head and controller are running fine, but the data logging is not.[/quote]
It should run tonight at 1:25 AM. To get the cron job to work properly on op340m, I had to make wrapper sh script which defines the perl library before |
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Fri Feb 29 13:51:17 2008, John, Summary, LSC, PD6 response
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I checked the response of PD6 using the AM laser. It looks happy enough.[IMG]elog:348/1[/IMG]
16 averages
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Sun Mar 2 23:43:45 2008, rana, HowTo, LSC, PD6 response
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John's PD plotting script is superior to all of the ones we had before; lets make him post the script so we can all use it.
Looks like PD6 is not too happy after all; the 199 MHz response is not much higher than the 166 MHz response. I thought we were supposed to have them balanced |
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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 11:13:15 2008, rob, Update, Electronics, RF Monitor (StocMon)
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[quote] It took some times because the written procedure to start the chiller is not very precise.[/quote]
It is actually very precise. Precisely wrong. |
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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 Feb 28 19:49:21 2008, rob, Update, Electronics, RF Monitor (StocMon)
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[quote]
With Ben, we hooked up the RF Monitor box into the PSL rack and created 4 EPICS channels for the outputs:
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Thu Feb 28 16:19:37 2008, josephb, Configuration, Computers, Mafalda rewired and multiple cameras running
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1) Mafalda is now connected via an orange Cat5E ethernet cord to the gigabit ethernet switch in rack in the office space. It has been labeled at both
ends with "mafalda".
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Thu Feb 28 19:37:41 2008, rob, Configuration, Computers, multiple cameras running and seisBLRMS
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[quote]1) Mafalda is now connected via an orange Cat5E ethernet cord to the gigabit ethernet switch in rack in the office space. It has been labeled
at both ends with "mafalda".
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Fri Feb 22 21:19:38 2008, Andrey, Bureaucracy, Computer Scripts / Programs, MDV library does not work at "LINUX 2"
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While working on Thursday evening with Matlab scripts "dttfft2" and "get_data", I noticed that mDV library does not work at computer "LINUX 2" (the third
computer in the control-room if you enter it from the restroom). There are multiple error messages if we try to run "hello_world", "dttfft2" or "get_data". |
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Thu Feb 28 12:31:33 2008, rob, Bureaucracy, Computer Scripts / Programs, MDV library does not work at "LINUX 2"
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[quote]
While working on Thursday evening with Matlab scripts "dttfft2" and "get_data", I noticed that mDV library does not work at computer "LINUX 2" (the third
computer in the control-room if you enter it from the restroom). There are multiple error messages if we try to run "hello_world", "dttfft2" or "get_data". |
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Wed Feb 27 22:05:03 2008, John, Update, LSC, Auxiliary locking
|
A summary of the status of the auxiliary arm locking effort.
To help with lock acquisition we are attempting to independently lock the Y arm using light injected through ETMY. At present this secondary light source |
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Tue Feb 26 20:24:04 2008, Andrey, Summary, TMI, Sorrow
|
As for that plot of three-dimensional surface, I indeed was wrong with the axis "Q_ETMX-Q_ITMX" (I put there wrong string "Q_ITMX-Q_ETMX"). On Friday plot
there were values 10^(-12) on the z-axis, and that should be really meters, but the point that as I realized on Monday, I have never calibrated experimental
measurement results from counts to meters , that's why it is this difference between 10^(-6) and 10^(-12). I still did not find the way to compare experim. |
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Sun Feb 24 10:51:58 2008, tf, Frogs, Environment, 40m in phdcomics?
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| [url=http://www.phdcomics.com/comics/archive.php?comicid=977][img]http://www.phdcomics.com/comics/archive/phd021308s.gif[/img][/url] |
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Fri Feb 22 20:42:44 2008, Andrey, Summary, Computer Scripts / Programs, It seems I succeeded in theoretical simulations
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I am pretty happy at this moment.
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Thu Feb 21 18:29:28 2008, John, Summary, General, HP Network Analyser Analyzer
|
The HP 4195A network analyser may be broken, measurements below 150MHz are not reliable. Above 150MHz everything looks normal. This may be caused by a problem
with its output (the one you'd use as an excitation) which is varying in amplitude in a strange way.
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Thu Feb 21 19:55:46 2008, rana, Update, Electronics, 2 BNC Cables, 1 Tee
|
I'm not sure where [COLOR=purple]Ward and Miller went to Analyzer school[/COLOR], but it was probably uncredited.
I turned it on and used 2 BNC cables and a T to hook up the source to the 2 inputs and measured the always-exciting TF of cable.
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Fri Feb 22 16:47:54 2008, rob, Update, Electronics, Baloney
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Well I guess Rana didn't study too hard at Professor School, either. If he'd even bothered to actually read John's entry, he might have looked at the RF
Out from the HP Analyzer. As it is, this experience so far has been like taking your car to a highly respected mechanic, telling him it's having acceleration
problems, and then he takes a rag and wipes some dirt off the hood and then tells you "It's running fine. That'll be 500 bucks."
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Fri Feb 22 15:16:33 2008, Andrey, Update, PEM, ITMX Accelerometer is NOT broken
|
As I wrote in message 330, there was a bad signal from ITMX accelerometer. I have found the reason: the BNC-cable which goes from the black board with
switches for accelerometer gain (1,10,100) towards DAQ-tower was completely disconnected from that black board with gain-switches. The end of the long |
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Fri Feb 22 14:45:06 2008, steve, Update, MOPA, laser power levels
|
At the beginning of this 1000 days plot shows the laser that was running at 22C head temp
and it was send to LLO
|
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Fri Feb 22 11:11:00 2008, rob, Update, Electronics, REFLDD problem found
|
I used a network analyzer that actually works to find a problem in the REFLDD electronics chain. There was loose (=bad) SMA-BNC adaptor on the output
of channel one of the HP RF Amplifier. It worked intermittently, so going onto the ISCT and fiddling with cables could sometimes temporarily fix the problem. |
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Fri Feb 22 02:51:20 2008, Andrey, Update, PEM, Accelerometer ITMX seems to be broken
|
As people probably know,
|