 Thu Dec 20 19:10:03 2007, waldman, Update, OMC, Stressful reattachment of heater
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Photos may follow eventually, but for now here's the rundown. I scraped the heater clean of the thermal epoxy using a clean razor blade. Then I stuffed
a small piece of lint free cloth in the OTAS bore and wrapped the OMC in tin foil. With a vacuum sucking directly from the face of the OTAS, I gently
scraped the glue off the OTAS aluminum. I wiped both the OTAS and the heater down with an isoproponal soaked lint-free cloth. I put a thin sheen of VacSeal |
Thu Dec 20 21:57:34 2007, Andrey, Update, Computer Scripts / Programs, Measurements in XARM today 
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Today at 2PM I started a program, it should change the suspension gains in the interval from 1.0 to 3.8 with the step 0.2. Estimated running time is till
3.30AM coming night.
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Fri Dec 21 20:32:25 2007, tobin, Update, Photos, GigE camera
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I couldn't resist any longer: I plugged in the Prosilica GC 750 GigE camera and took it for a spin. This is the little CMOS camera which sends out video
over gigabit ethernet.
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Wed Dec 26 15:00:06 2007, rana, Update, SUS, ETMY tripping
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Steve mentioned to me that ETMY is still tripping more than ETMX. The attached DV plot
shows the trend of the watchdog sensors; essentially the RMS fluctuations of the shadow
sensors. (note** DV can make PNG format plots directly which are much better than JPG
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 Wed Dec 26 15:12:48 2007, rana, Update, SUS, ETMY tripping
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It turned out that the ETMY POS damping gain was set to 1.0 while the ETMX had 3.8.
I put both ETMs to a POS gain of 4 and then also set the PIT, YAW and SIDE gains for
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Thu Dec 27 12:12:02 2007, pkp, Update, , Update on GigE Camera
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So I finally got the linux software to compile on mafalda. I got the software to dump all the information regarding the camera onto a file. I tried to take
a tiff snap and came up empty. So I looked at the configuration file and realized that the camera thinks that the frame-rate is a nan. Am reading up the
manual to fix the frame-rate manually and then will attempt to take another snap.
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Thu Dec 27 13:08:04 2007, rana, Update, SUS, ETMY tripping
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Here's a trend from the last 2 days of ETMX and ETMY. You can see that the damping gain increase
has made them now act much more alike. Problem fixed. |
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Thu Dec 27 18:18:56 2007, rana, Update, Computers, Update on GigE Camera
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[quote]So I finally got the linux software to compile on mafalda. I got the software to dump all the information regarding the camera onto a file. I tried
to take a tiff snap and came up empty. So I looked at the configuration file and realized that the camera thinks that the frame-rate is a nan. Am reading
up the manual to fix the frame-rate manually and then will attempt to take another snap.
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Sun Dec 30 02:36:35 2007, pkp, Update, General, Another update
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So I followed suggestions 1 and 3 so far and have started writing up what all needs to be done in order to compile and use the camera. I wrote a program
to ping the camera and get its properties and am working on a program to get an image. The reason why I want to write my own programs to do this, is that
it will be easier to reuse and also to compile/use in the first place. The programs currently rest in /cvs/cds/caltech/target/Prosilica/ . Unfortunately |
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Thu Jan 3 08:53:55 2008, steve, Update, SUS, etmy vs etmx
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Rana have corrected sus gain damping setting of ETMY 8 days ago
gain settings: pos, pit, yaw & sd
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Thu Jan 3 09:12:59 2008, steve, Update, PSL, MZ servo
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Here is MZ trend for one year and 40 days.
Now days it runs out of range on the low side.
This is the weakest link in the psl today. |
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Thu Jan 3 09:55:11 2008, steve, Update, SUS, etmy sus damping restored
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| ETMY watch dog was lost at midnight |
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Fri Jan 4 08:42:03 2008, steve, Update, SUS, etmy trips again
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ETMY sus damping tripped at 6am this morning
It was reset. We should put an accelerometer to the south end to see
the garbage dumping effect. |
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Mon Jan 7 09:01:39 2008, steve, Update, SUS, BS sus damping restored
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| The BS sus damping was lost at 8am Sunday morning. |
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Tue Jan 8 15:20:17 2008, Pkp, Update, Cameras, GigE update
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[Tobin , Pinkesh]
Finally we got the camera doing something (other than giving out its attributes). The only thing that seems to work so far is a program called AAviewer, |
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Wed Jan 9 10:47:15 2008, fricke, Update, Computers, ethernet wiring in office/control room
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The electrical people have been here for three days, installing ethernet cables and drops in the 40m office area, in the old conduits where there was power
and 10base2. Soon we will have reliable ethernet connections, instead of relying on switches hanging from the ceiling, etc! |
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Wed Jan 9 20:36:42 2008, Go, Update, Treasure, Money in lab
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| Go's Desk. |
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Thu Jan 10 10:38:02 2008, steve, Update, SUS, etmy damping restored
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The IST building onstruction has really started yesterday and continuing today with big heavy ground breaking
machinary. The MC is holding lock and the suspentions are hanging on.
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Thu Jan 10 12:08:23 2008, steve, Update, SUS, why did the BS move?
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| |
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Thu Jan 10 13:45:52 2008, Pkp, Update, Cameras, GLIBC Error
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So, I have tried to compile the camera files which are in /cvs/cds/caltech/target/Prosilica/examples for the past 2 days now and have been unable to get
rid of the following error. (specifically ListCameras.cpp, as it doesnt have any other libraries required, which unnecessarily complicates things)
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Thu Jan 10 15:04:04 2008, steve, Update, SUS, illuminator light effect on BS position
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The bs chamber illuminator light was turned on this morning and left on.
Earlier on Rana noticed that the bs moved.
I follwed up to see what happened. I turned off oplev servo and tried to recenter on oplev pd
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Fri Jan 11 17:01:51 2008, pkp, Update, Cameras, GigE again
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So, here I detail all the efforts on the GigE so far
(1) The GiGE camera requires a minimum of 9 kb packet size, which is not available on mafalda or on my laptop ( both of which run Ubuntu and the Camera |
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Mon Jan 14 14:41:09 2008, steve, Update, SUS, etmy sus damping restored & mz relocked
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Tree days trend of MZ HV drift is typical these days.
So as the etmy sus inability to hold damping for longer then 2-3 days. |
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Tue Jan 15 13:15:27 2008, tobin, Update, Environment, lots of noise
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| They're throwing concrete around at the construction site. |
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Wed Jan 16 14:06:24 2008, rob, Update, LSC, monday's locking
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rob, tobin, johnnie
We did some locking work monday night, with decent progress. Working in the PRFPMI style, we managed to get through the part of the script that hands |
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Wed Jan 16 14:09:45 2008, rob, Update, LSC, tuesday's locking
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I got a little further with the locking (PRFPMI) last night, after discovering that the cable going from the CM board to the MC board was unplugged at
the MC side. This explains why we weren't able to engage the AO path last night. Tonight, I got up to the point where DARM is handed off to OMC transmission, |
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Wed Jan 16 18:24:41 2008, rana, Update, SUS, ETMY Watchdog
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Because [COLOR=purple][B]Steve keeps complaining about ETMY[/B][/COLOR], I looked at some minute trend to see if there was something exotic happening at
that time. It looks like there is some tremendous seismic activity to make it happen.
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Thu Jan 17 14:13:20 2008, rob, Update, LSC, Wednesday's locking
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Incremental progress on locking yet again. This time the handoff of DARM to the OMC worked, and progress halted at handing off control of the common mode
to REFL166. |
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Thu Jan 17 15:11:13 2008, josephb, Update, Cameras, Working on Malfalda
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1) I can statically compile the ListCamera code (which basically just goes out and finds what cameras are connected to the network) on Malfalda and use
that compiled code to run on Linux2 without a problem. Simply needed to add explicit links to libpthread.a and librt.a.
(i.e. -Bstatic -L /usr/lib/ -lpthread -Bstatic -L /usr/lib -lrt)
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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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Thu Jan 17 20:50:55 2008, tobin, Update, General, fiber coupling
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Sam, John, and I matched the beam from an NPRO into a fiber on the SP table today. In doing so we used our GigE camera for a physics application for perhaps
the first time, viewing the transmitted mode from the fiber during initial alignment. (I used my laptop running Windows and a 100 megabit switch.) |
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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 18 15:31:47 2008, rob, Update, LSC, Thursday's locking
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[I]rob, johnnie, andrey[/I]
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Mon Jan 21 23:30:03 2008, Andrey, Update, Computer Scripts / Programs, Matlab Program for Q-factor measurements (XARM -> ITMX and ETMX)
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Finally I overcame difficulties with adapting Sonia's Matlab programs for XARM (Sonia's program was for MC),
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Tue Jan 22 02:33:45 2008, rob, Update, LSC, DRMI work
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0) The ETMY oplev needs work/centering
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Tue Jan 22 13:11:03 2008, tobin, Update, ASC, ETMY oplev recentered
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| The light wasn't even on the diode. |
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Wed Jan 23 09:27:55 2008, steve, Update, , etmy sus damping restored
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| Seismis event trips etmy |
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Wed Jan 23 11:41:06 2008, steve, Update, PEM, sulfur smell in 40m
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Led - acid car batteries were overcharged in the machine shop next door
and sulfuric acid smell is coming over to the ifo room.
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Thu Jan 24 11:52:56 2008, steve, Update, PEM, the mud is cleaned up & MOPA shutter is opened
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Safety glasses are required again!
I have just opened the mopa shutter.
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Fri Jan 25 09:22:21 2008, steve, Update, PEM, burned toast award goes to
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DYM for collaborating with the enemy.
In order to minimize the number of ants visiting our lab we have to take out side the lab
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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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Fri Jan 25 21:36:40 2008, rana, Update, CDS, mDV / channel issues
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[COLOR=orange]Fri Jan 25 21:30:00 2008[/COLOR]
As it turns out, the residual problem with the mDV stuff was not to do with our button pushing episode but instead fallout from the 'turning off of the |
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Sat Jan 26 02:34:34 2008, Andrey, Update, Computer Scripts / Programs, Overnight Measuremts in XARM
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I am running the program for measuring RMS of peaks in XARM tonight. I just started it, and it will run for about 9 hours until noon on Saturday. Please
do not disturb the interferometer. Now the XARM is locked, it should stay locked over the night.
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Sat Jan 26 22:00:03 2008, John, Update, General, LSC-TRY_OUT and ETMY-QPD
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In the path from the ETM to the trans PD and QPD at the Y end I have replaced a BS1-1064-10-2037-45P with a polariser. The power falling on these diodes
has been reduced. When the arm is locked in its nominal state the transmitted power is now less than 1.
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Sun Jan 27 21:44:48 2008, rana, Update, CDS, Seismic BLRMS on Matlab
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I wrote a matlab script to produce band limited RMS trends from our accelerometers. It mimics the code written
by Ed Daw which makes the seismic FOMs at the sites.
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Mon Jan 28 18:56:47 2008, rana, Update, DMF, seisBLRMS 1.0
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[B]I made all of the updates I aludded to before:[/B]
[LIST]
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Tue Jan 29 14:56:39 2008, rob, Update, DMF, seisBLRMS 1.0
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The [COLOR=red]seisBLRMS[/COLOR] 1.0 program crashed at ~7:20 pm last night, so we didn't get data from overnight. It crashed when framecaching failed.
I added
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Wed Jan 30 13:09:55 2008, Andrey, Update, SUS, New results for XARM (pdf)
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See attachments: pdf-presentation with plots in "true" axes Q_ETMX and Q_ITMX, and seismic backgound measurement.
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Wed Jan 30 20:39:31 2008, rob, Update, DMF, seisBLRMS
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In order to reduce the probability of [COLOR=red]seisBLRMS[/COLOR] crashing due to unavailability of data, I edited [COLOR=red]seisBLRMS.m[/COLOR] so that |
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Fri Feb 1 10:43:05 2008, John, Update, Environment, Construction work
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| The boys next door have some [URL=http://dziban.ligo.caltech.edu:40/40m/?mode=full&reverse=0&reverse=1&npp=20&subtext=hammer]bigger noisier[/URL] toys. |