 Wed Oct 17 18:46:33 2007, rana, Configuration, General, eLog Change
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This is the first entry in the [U]new[/U] 40m eLog.
Its [B]GWs[/B] or bust now! :D
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Thu Oct 18 14:52:35 2007, rana, Routine, ASC, test
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[B]test[/B]
[LINE]X-(:P;(:)) |
Thu Oct 18 15:03:14 2007, ajw, Routine, General, this is only a test 
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[IMG]elog:3/1[/IMG]
[IMG]elog:3/2[/IMG] |
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Fri Oct 19 16:11:38 2007, pkp, Other, OMC, OMC PZT response
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Sam and I locked the laser to the OMC cavity and looked at the error signal as a function of the voltage applied to the OMC PZT.
Here are two plots showing the response as a function of frequency from 1 kHz to 100 kHz and another high-res response in the region of 4.5 kHz to 10 kHz.
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Sat Oct 20 11:54:13 2007, waldman, Other, OMC, OMC and OMC-SUS work
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[Rich, Chub, Pinkesh, Chris, Sam]
Friday the 18th was a busy day in OMC land. Both DCPDs were mounted to the glass breadboard and the OMC-SUS structure was rebuilt to the point that an |
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Mon Oct 22 12:02:59 2007, ajw, Routine, General, STACIS as microseismic shaker
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In case we ever want to use our Stacis systems as shakers, check this:
[URL=http://www.techmfg.com/appnotes/Stacis_microseismic_shaker_appnote.htm]link[/URL] |
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Mon Oct 22 19:27:14 2007, pkp, Other, OMC, PZT calibration/ transfer function.
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We measured the PZT transfer function by comparing the PZT response of the circuit with the cavity in the loop, with that of the circuit without the cavity
in the loop. Basically measure the transfer function of the whole loop with the laser/PZT and Op-amps in it. Then take another measurement of the transfer
function of everything else besides the PZT and from both these functions, we can calculate the PZT response.
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 Tue Oct 23 09:01:00 2007, rana, Other, OMC, PZT calibration/ transfer function.
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Are you sure that the error signal sweep is not saturated on the top ends? This is usually the downfall
of this calibration method. |
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Tue Oct 23 11:08:20 2007, steve, Other, General, brush fires
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There are big brush fires around LA
40 days plot show no effect in the 40m lab |
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Wed Oct 24 01:43:32 2007, Andrey Rodionov, Other, General, PDF-file -> Will report about first results for XARM during Wednesday meeting
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Here is the pdf-file with some graphs showing first results for XARM optimization.
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Wed Oct 24 08:58:09 2007, steve, Other, PSL, laser headtemp is up
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C1:PSL-126MOPA_HTEMP is 19.3C
Half of the chiller's air intake was covered by loose paper |
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Thu Oct 25 17:52:45 2007, waldman, Other, OMC, OMCs with QPDs
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[Rich, Chub, Pinkesh, Sam]
Yesterday we got the QPD, OTAS, and PZT cabling harness integrated with the OMC. We found a few things out, not all of them good. The QPDs went on no |
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Thu Oct 25 22:02:58 2007, rob, Routine, PSL, HEPAs maxed
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| In light of the SoCal fires, I turned the PSL HEPAs up to 100%. |
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Thu Oct 25 23:35:36 2007, waldman, Other, OMC, Hang the OMC!
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[Pinkesh, Sam]
We tried, convicted and hung the OMC today. The OMC was found guilty of being overweight, and unsymmetrically balanced. The unsymmetry was kind of expected |
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Fri Oct 26 09:10:17 2007, steve, Routine, PEM, PEM &PSL trend
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The fires are out, lab particle counts are up.
Psl HEPAs are at 100% and mobel HEPAs are just turned on
20 days plot and 5 hrs plot below |
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Fri Oct 26 16:19:29 2007, Tobin Fricke, Routine, IOO, MC resonances
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We would like to measure the absorption of the mode cleaner optics. The plan is to repeat <a href="http://ilog.ligo-wa.caltech.edu:7285/mLIGO/Cleaning_the_Mode_Cleaner">Valera's
experiment</a> in which we track the MC's thermal resonances to infer their power absorption. Last night Rana and I hooked up a lock-in amplifier to heterodyne
the MC servo signal by 28 kHz and piped the output into an ADC using the MC_AO channel. We did not find any resonances.
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Fri Oct 26 17:34:43 2007, waldman, Other, OMC, OMC + earthquake stops
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[Chub, chris, Pinkesh, Sam]
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Fri Oct 26 21:48:40 2007, waldman, Configuration, OMC, Fiber to 056
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I set up a 700 mW NPRO in Rana's lab and launched it onto a 50m fiber. I got a few mW onto the fiber, enough to see with a card before disabling the laser.
The fiber now runs along the hallway and terminates in rm 056. Its taped down everywhere someone might trip on it, but don't go out of your way to
trip on it or pull on it because you are curious. Tomorrow I will co-run a BNC cable and attenuate the NPRO output so it can only send a few mW and so |
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Sat Oct 27 19:00:44 2007, waldman, Configuration, OMC, Hanging, locked OMC with REFL extracted.
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I got the OMC locked to the fiber output today. It was much more difficult than I expected and I spent about 30 minutes or so flailing before stopping
to think. The basic problem is that the initial alignment is a search in 4-dimensional space and there is naturally only one signal, the reflected DC
level, to guide the alignment. I tried to eyeball the alignment using the IR card and "centering" the beams on mirrors, but I couldn't get close enough |
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Sun Oct 28 03:03:42 2007, rana, Configuration, IOO, Three Way Excitement
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[SIZE=2][B]We've been trying to measure the MC mirror internal mode frequencies so that we can measure
their absorption before and after drag wiping.[/B][/SIZE]
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Mon Oct 29 09:16:31 2007, steve, Routine, VAC, the rga is back
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We had no filament current since last power glitch of Oct. 8, 2007
First I thought that the filament was lost, but it was only bad contact.
The rga head pins were oxidized. Rga was turned back on last Friday.
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Mon Oct 29 09:46:50 2007, steve, Routine, VAC, vac & pem trend
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Pumpdown 64 pumped by maglev for 125 days
pd64-m-d125
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Mon Oct 29 11:07:22 2007, waldman, Software Installation, OMC, Software install on OMS
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[Alex, Sam]
We spent a little time this morning working on OMS and getting things restarted. A few changes were made. 1) We put openmotif on OMS so that the burtrb |
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Mon Oct 29 12:20:15 2007, waldman, Configuration, OMC, Changed OMS filters
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I changed the OMS configuration so that some of the OMC-SUS LED channels go to a breakout box so that we can input the PDH error signal. After lunch,
we will try to lock the cavity with a PDH error signal and digital filters. Then its on to dither locked stuff. Note that this LED business will have
to be changed back some day. For now, it should be extremely visible because there are dangling cables and a hack job interface lying around. |
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Mon Oct 29 23:10:05 2007, waldman, Configuration, OMC, Lost in DAQspace
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[Pinkesh, Sam]
In setting up a Digital based control of the hanging OMC, we naively connect the Anti-Imaging filter output to an Anti-Aliasing input. This led to no |
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Mon Oct 29 23:25:42 2007, tobin, Software Installation, CDS, frames mounted
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I mounted the frames directory on mafalda and linux3. It's intentionally not listed in the /etc/fstab so that an fb crash won't prevent the controls machines
from booting. The command to mount the frames directory is:
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Tue Oct 30 00:47:29 2007, rana, Other, IOO, MC Ringdowns
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I did a bunch of [B]MC ringdown measurements[/B] using the PD that Rob set up. The idea is to put a fast PD (PDA255)
looking at the transmission through MC2 after focusing by a fast lens. The input to the MC is turned off fast
by flipping the sign of the FSS (Andri Gretarsson's technique).
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Tue Oct 30 13:58:07 2007, ajw, Configuration, IOO, MC Ringdowns
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Here's a quick fit-by-eye to the latter part of the data from tek00000.xls.
The prediction (blue) is eqn 41 of
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Tue Oct 30 16:55:40 2007, tobin, Routine, , Drag-wiping perfected
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Steve, Tobin
Steve procured an assortment of syringes from the bio storeroom and we practiced drag-wiping the SOS in the flow bench. Using a 50 microliter Hamilton |
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Tue Oct 30 19:32:13 2007, tobin, Problem Fixed, Computers, conlogger restarted
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I noticed that the conlogger wasn't running. It looks like it hasn't been running since October 11th. I modified the restart_conlogger script to insist
that it run on op340m instead of op440m, and then ran it on op340m. |
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Tue Oct 30 20:15:24 2007, tobin, Other, Environment, earthquake
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Rana, Tobin
Largish (M5.6) earthquake in San Francisco sent our optics swinging. |
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Wed Oct 31 08:33:54 2007, rana, Problem Fixed, SUS, Vent measurements
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There was a power outage during the day yesterday; whoever was around should post something here about the
exact times. Andrey and David and Tobin got the computers back up - there were some hiccups which you can
read about in [B]David's forthcoming elog entry[/B].
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Wed Oct 31 08:34:35 2007, rana, Other, IOO, loss measurements
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In the end, we were unable to get a good scatter measurement just because we ran out of steam. The idea was to get a frame
grab image of MC2 but that involves getting an unsaturated image.
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Wed Oct 31 08:38:35 2007, rana, Problem Fixed, IOO, MC autolocker
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The MC was having some trouble staying locked yesterday. I tracked this down to some steps in the last
half of the [FONT=Comic Sans MS][I]mcup[/I][/FONT] script; not sure exactly which ones.
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Wed Oct 31 09:45:28 2007, waldman, Other, OMC, Resolution to DAQland saga
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[Jay, Sam]
We did a rough accounting for the linear delay this morning and it comes out more or less correct. The 10 kHz 3rd order butterworth AA/AI filter gives |
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Wed Oct 31 10:31:23 2007, Andrey Rodionov, Routine, VAC, Venting is in progress
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We (Steve, David, Andrey) started venting the vacuum system at 9.50AM Wednesday morning. |
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Wed Oct 31 15:02:59 2007, tobin, Routine, IOO, Mode Cleaner Mode Tracking
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I processed the heterodyned mode cleaner data yesterday, tracking the three 28 kHz modes corresponding to MC1, MC2, and MC3. Unfortuntately the effect
of our MC power chopping is totally swamped by ambient temperature changes. Attached are two plots, one with the tracked mode frequencies, and the other
containing dataviewer trends with the MC transmitted power and the room temperature. Additionally, the matlab scripts are attached in a zip file. |
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Wed Oct 31 15:22:59 2007, rob, Configuration, IOO, Mode Cleaner transfer function
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I measured the transfer function of the input mode cleaner using a PDA255 and the ISS. First I put the PD in front of the ISS out-of-loop monitor diode
and used an SR785 to measure the swept sine transfer function from the Analog IN port of the ISS to the intensity at the PD. Then I moved the PD to detect
the light leaking out from behind MC2, using ND filters to get the same DC voltage, and measured the same transfer function. Dividing these two transfer |
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Wed Oct 31 19:26:08 2007, Andrey Rodionov, Routine, General, Photographs of "Mode-Cleaner Entrance" 9x
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Here are the pictures of "inside the chamber". |
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Wed Oct 31 23:55:17 2007, waldman, Other, OMC, QPD tests
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The 4 QPDs for the OMC have been installed in the 056 at the test setup. All 4 QPDs work and have medm screens located under C2TPT. The breadboard mounted
QPDs are not very well centered so their signal is somewhat crappy. But all 4 QPDs definitely see plenty of light. I include light and dark spectra below.
QPDs 1-2 are table-mounted and QPD 2 is labeled with a bit of blue tape. QDPs 3-4 are mounted on the OMC. QPD3 is the near field detector and QPD4 is |
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Thu Nov 1 01:28:04 2007, waldman, Other, OMC, First digital lock of OMC
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[Pinkesh, Sam]
We locked a fiber based NPRO to the suspended OMC tonight using the TPT digital control system. To control the laser frequency, we took the PZT AI output |
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Thu Nov 1 09:17:27 2007, steve, Routine, VAC, vent 64
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Yesterday before vent I could not lock MC, therfore I could not measure the
transmitted power at MC2
The vent went well. We had lots of help.
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Thu Nov 1 11:45:30 2007, tobin, Configuration, IOO, Mode cleaner drag-wiping
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Andrey, Bob, David, John Miller, Rana, Rob, Steve, Tobin
Yesterday we vented the vacuum enclosure and opened up the chamber containing MC1 & MC3 by removing the access connector between that chamber and the OMC |
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Thu Nov 1 16:34:47 2007, Andrey Rodionov, Summary, Computers, Limitation on attachment size of E-LOG
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I discovered yesterday when I was attaching photos that it is NOT possible to attach files whose size is 10Mb or more. Therefore, 10Mb or something very
close to that value is the limit. |
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Thu Nov 1 16:42:48 2007, Andrey Rodionov, Summary, Environment, End of Daylight Saving Time this weekend
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Useful information for everyone, as a friendly reminder:
According to the web-page
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Thu Nov 1 16:51:33 2007, d40, AoG, General, D40
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[SIZE=3][FONT=Comic Sans MS]If you vant see D40 againn, you leave one plate goulash by N2 tank in morning.
Vit the good [COLOR=darkred][B]paprikash[/B][/COLOR] this time!!![/FONT][/SIZE] |
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Thu Nov 1 19:53:02 2007, Andrey Rodionov, Bureaucracy, Photos, Tobin's picture
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Thu Nov 1 19:53:34 2007, Andrey Rodionov, Bureaucracy, Photos, Robert's photo
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Thu Nov 1 19:54:22 2007, Andrey Rodionov, Bureaucracy, Photos, Rana's photo
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Thu Nov 1 19:55:03 2007, Andrey Rodionov, Bureaucracy, Photos, Andrey's photo
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Thu Nov 1 19:55:59 2007, Andrey Rodionov, Bureaucracy, Photos, Andrey, Tobin, Robert - photo
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Thu Nov 1 19:58:07 2007, Andrey Rodionov, Bureaucracy, Photos, Steve and Tobin's picture
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