 Mon Nov 19 14:32:10 2007, steve, Bureaucracy, SAFETY, grad student safety training
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John Miller and Alberto Stochino has received the 40m safety bible.
They still have to read the laser operation manual and sign off on it. |
Tue Nov 20 10:11:33 2007, John, Summary, PSL, PMC pole measurements 
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We measured the PMC pole in the following way.
1. Reduced laser power by rotating lambda/2 plate at laser output. Thermal effects in the PZT distort resonance peaks. Reducing power too much leads to |
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Tue Nov 20 11:10:07 2007, tobin, Update, Computers, epics access from matlab
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I installed "[url=http://www.slac.stanford.edu/~strauman/labca/]labca[/url]", which allows [b]direct access to EPICS channels from within Matlab[/b]. It
comes with both Linux and Solaris binaries (and source) but I've only tried it on linux.
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Tue Nov 20 13:06:57 2007, tobin, Configuration, Computers, linux1 has new disk
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Alex put the new hard disk into linux1 along with a fresh install of linux (CentOS). The old disk was too damaged to copy.
Alex speculates that the old disk failed due to overheating and that linux1 could use an extra fan to prevent this in the future. |
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Tue Nov 20 18:02:54 2007, John, Summary, Computers, PSL_Main screen
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| I've updated the PSL_MAIN screen. The old version may be found in cvs/cds/caltech/medm/old/medm/psl. |
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Tue Nov 20 18:35:20 2007, John, HowTo, Computers, MatLab in Emacs
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If you can't get MatLab to run in emacs try adding the following to the .emacs file
(setq matlab-shell-command-switches '("-nojvm"))
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Wed Nov 21 14:31:41 2007, rob, Update, PSL, FSS twiddle
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I `tweaked' the FSS path today. Here's what I did:
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Mon Nov 26 10:17:31 2007, steve, Omnistructure, SUS, etmy sus damping restored
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20 days plot is showing etmy loosing damping 4 times.
I zoomed in with each event. Three of them could of been triggered
by garbage loading just outside. However attachment 2 plot demonstrating that small earthquake or seismic event
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Tue Nov 27 15:45:08 2007, rob, Configuration, PSL, FSS loop
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It's unclear (to me, at least) what was the end result of the FSS path tweaking before Thanksgiving. Today I measured the open loop gain, and it was still
around 100kHz, even with the gain sliders maxed out, but it looked really crappy with a sharp cutoff around the UGF. Then, on a lark, I pushed around |
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Tue Nov 27 15:47:17 2007, rob, Configuration, IOO, MC loop
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After the FSS running pretty quick, I checked the MC loop. I used TPA 1&2.
MC loop
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 Tue Nov 27 16:18:58 2007, rob, Configuration, IOO, MC loop
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Reduced the common gain to 22dB in the [COLOR=blue]mcup[/COLOR] script, so that the WFS would not blow the lock. The above measure of the OLG was done
without the mcWFS running, so may be a low estimate as compared to when the alignment is perfect. |
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Tue Nov 27 20:47:00 2007, tobin, Update, PSL, FSS
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Rana, Tobin
We looked at the RF PD signal to the FSS (siphoning off a signal via a minicircuits directional coupler) and also took an open loop transfer function of |
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Wed Nov 28 04:21:46 2007, rana, Update, PSL, FSS
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[quote]Rana, Tobin
[SIZE=1]
We looked at the RF PD signal to the FSS (siphoning off a signal via a minicircuits directional coupler) and also took an open loop transfer function of |
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Wed Nov 28 08:47:29 2007, steve, Omnistructure, VAC, rga is out of order
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The rga is not working since Nov 10
The controller is broken.
pd65-m-d23 |
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Wed Nov 28 12:43:53 2007, Andrey, Bureaucracy, , Here was the PDF-file of my presentation
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I was making a report with powerpoint presentation during that Wednesday's 40-m meeting.
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Wed Nov 28 16:18:15 2007, Alberto, Metaphysics, Environment, so clean you can eat on it
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I tidied up the desks in the lab, brought the Spectrum Analyzers back to the Salumeria (you don't want to know about that), sorted a lot of stuff and boxed
up what I didn't know (you can find it in a couple of carton boxes on the table).
The blackmail with the pie might not work next time.
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Wed Nov 28 16:46:28 2007, rana, Configuration, Computers, scientific linux 5.0
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I tried installing Scientific Linux on Tiramisu. The installation process was so bad (really)
that I quit after 15 minutes. Its back to booting Ubuntu as if nothing had ever happened. Let
us never speak of Scientific Linux again. |
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Wed Nov 28 17:15:26 2007, rana, Configuration, SUS, ETMY damping / watchdogs
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Steve has noted that ETMY was often tripping its watchdog. I saw this again today.
So I checked the damping settings. Someone had set the SIDE gain to +1. The gain which gives
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Wed Nov 28 17:41:34 2007, rob, Update, PSL, FSS again
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I investigated the FSS a bit more today. I looked at the signals coming out of the FSS frequency reference, and saw that both the LO and PC drive were
distorted, non-symmetric waveforms. In addition, the LO path had a 3dB attenuator, meaning the mixer was starved. I placed mini-circuits SLP-30 filters
in both paths, and now both are nice sine waves. I also took out the 3dB att. With this work, and the CG slider maxed out at 30, the FSS open loop gain |
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Wed Nov 28 19:02:41 2007, Andrey, Bureaucracy, WIKI-40M Update, New WIKI-40M page describing Matlab Suspension Modeling
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I created the WIKI-40m page with some details about my today's talk on the 40-m lab meeting.
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Wed Nov 28 19:44:18 2007, tobin, Update, PSL, HEPA
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| I found the HEPA turned off completely. I turned it on. |
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Thu Nov 29 10:36:47 2007, alberto, Configuration, Computer Scripts / Programs, Agilent 82357B GPIB to USB Interface Installation Procedeure
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To run the Agilent Automation-Ready CD provided with the interface is only the first step of the installation. Apparently there should be also a second
CD with the drivers for Windows XP but I couldn't find it. So, after Installaing the IO Libraries Suite from the CD, I had to install the drivers with
an executable downloaded from the Agilent's website at:
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Thu Nov 29 11:10:54 2007, rob, Omnistructure, VAC, RGAlogger sleeping
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Without the RGA controller responding, the RGAlogger script just hangs. Rather than fix it, I just put it to sleep by commenting out the line in op440m
crontab file. Once we get it running again, we'll move the cronjob to op340m. |
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Thu Nov 29 14:29:22 2007, tobin, Configuration, Computers, linux1 httpd/conlogger fixed
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I think I fixed the [url=http://linux1/cgi-bin/conlog_web.pl]conlogger web interface on linux1[/url].
Steps necessary to do this:
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Thu Nov 29 18:10:13 2007, Alberto, HowTo, Computer Scripts / Programs, GPIB Scripts
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I've spent a lot of time trying to configurate the GPIB-USB interface for the HP4195. After installing 1) the Agilent libraries, 2) the drivers, 3) the
matlab Instrument Toolbox, 4) Jamie script, 5) Alice's script the computer can see the HP but still they can't 'talk' to each other.
I give up. I asked Alice Wang how she managed to get data. I'm not sure she used the GPIB interace. Rob said she might have used the old fashion floppy |
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Thu Nov 29 19:35:14 2007, rana, HowTo, Computer Scripts / Programs, GPIB Scripts
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[quote]I've spent a lot of time trying to configurate the GPIB-USB interface for the HP4195. After installing 1) the Agilent libraries, 2) the drivers,
3) the matlab Instrument Toolbox, 4) Jamie script, 5) Alice's script the computer can see the HP but still they can't 'talk' to each other.
I give up. I asked Alice Wang how she managed to get data. I'm not sure she used the GPIB interace. Rob said she might have used the old fashion floppy |
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Thu Oct 25 00:01:21 2007, rana, Software Installation, CDS, GEO DV => LIGO DV
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[URL=http://www.aei.mpg.de/~hewitson/]Martin Hewitson[/URL] of [B]GEO600[/B] fame has modified the cool GEO DV
to work with the LIGO NDS system with some NDS advice from [COLOR=darkgreen]Rolf[/COLOR] (who's over in Germany this week).
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Fri Nov 30 11:22:22 2007, ajw, Summary, CDS, GEO DV => LIGO DV
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[quote][URL=http://www.aei.mpg.de/~hewitson/]Martin Hewitson[/URL] of [B]GEO600[/B] fame has modified the cool GEO DV
to work with the LIGO NDS system with some NDS advice from [COLOR=darkgreen]Rolf[/COLOR] (who's over in Germany this week).
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Fri Nov 30 11:44:57 2007, rob, Configuration, Electronics, ETMX oplev
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In the interests of getting the Xarm alignment script working again, I reset the local damping gains for the test masses to their previous known working
values (1), then I noticed that the ETMX oplev was dead. Since the scripts use the oplev motion as a readback for the optic motion, this means the script
was basically blindly swinging the optics around. Some monkeying around with swapping HeNe power supplies eventually led to the conclusion that the power |
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Fri Nov 30 13:46:50 2007, rob, Configuration, Electronics, ETMX oplev dead again
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[quote]In the interests of getting the Xarm alignment script working again, I reset the local damping gains for the test masses to their previous known
working values (1), then I noticed that the ETMX oplev was dead. Since the scripts use the oplev motion as a readback for the optic motion, this means
the script was basically blindly swinging the optics around. Some monkeying around with swapping HeNe power supplies eventually led to the conclusion |
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Fri Nov 30 19:11:05 2007, rana, Configuration, Electronics, ETMX oplev dead again
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I removed the ETMX HeNe and put in on a test table and it fired up fine. In its
previous location the light on the HeNe power supply was not lighting up. If
that's still on over the weekend we'l blame the power strip; the HeNe is a JDS
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Fri Nov 30 19:29:14 2007, rana, Configuration, SUS, new screen
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Andrey is working on a new screen to show us the drift of the optics by alarming on
their osem values. [COLOR=darkred]You can find it under SUS as 'Drift Mon' from the site map.[/COLOR]
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Fri Nov 30 19:46:58 2007, rana, Configuration, Computers, EPICS Time Bad again
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The time on the EPICS screens is off by 10 minutes again. Por Que?
Its because the ntpd on scipe25 wasn't restarted after the last boot. If someone
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Fri Nov 30 20:13:57 2007, dmass, Summary, General, HeNe UniPhase Laser
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Data for the Uniphase 1.9 mW HeNe laser (labeled: "051507 From ISCT-BS") SN: 1284131 Model: 1103P
I used the Photon Beamscanner to obtain all data, then fit w(z) as shown on the plot with parameters w_0, z_R, and hidden parameter delta,
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Fri Nov 30 20:17:26 2007, Andrey, Configuration, PEM, Accelerometers and alum.plates for them
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All 6 accelerometers which were located near the ITMX are turned off and disconnected from the power cords.
Actually these accelerometers are now in the office area on the electronics bench (to the left from Steve Vass' place).
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Fri Nov 30 21:27:24 2007, rana, DAQ, PEM, weather / stacis / c1pem1
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I was trying to add some Seis BLRMS channels to the c1pem1 processor so that we could have DMT trends.
Then I found that none of the Weather channels have been working for a year or so. I could also not
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Sun Dec 2 17:37:33 2007, rana, Omnistructure, Computers, Network Cabling in the Office
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We all know that we've spent many integrated man hours trying to figure out why our network connections
in the office area don't work. Usually its because of the bad hub around the Tobin/Osamu desk.
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Sun Dec 2 21:02:12 2007, rana, Configuration, IOO, MC SUS re-alignment
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[COLOR=purple][SIZE=2][B][FONT=Comic Sans MS]The spot on MC2 was not centered, so I put it back in the center:[/FONT][/B][/SIZE][/COLOR]
[LIST]
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Sun Dec 2 21:07:39 2007, rana, Configuration, IOO, MC SUS re-alignment
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[COLOR=darkblue][CODE]you asked for: diff 2007/12/01,4:58:48 2007/12/03,4:58:48 utc 'MC.*COMM'
LIGO controls: differences, 2007 12/01 04:58:48 utc vs. 2007 12/03 04:58:48 utc
__Epics_Channel_Name______ __Description__________ __value1____ __value2____
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Sun Dec 2 21:13:16 2007, rana, Configuration, IOO, MC SUS re-alignment
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Mon Dec 3 16:24:47 2007, tobin, HowTo, Computers, GNU screen
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[url=http://jmcpherson.org/screen.html]GNU screen[/url] is a utility that can be quite handy for managing long-running psuedo-interactive terminal programs
on remote machines. In particular, I think it might be useful in developing and testing "Matlab DMT" tools on Mafalda. |
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Mon Dec 3 00:10:42 2007, rana, DAQ, Computer Scripts / Programs, linemon
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I've started up one of our first Matlab based DMT processes as a test.
There's a matlab script running on Mafalda which is measuring the height of the 60 Hz peak
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Mon Dec 3 17:55:39 2007, tobin, HowTo, Computer Scripts / Programs, linemon
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Matlab's Signal Processing toolbox has a [url=http://www.mathworks.com/access/helpdesk/help/toolbox/signal/index.html?/access/helpdesk/help/toolbox/signal/spectrum.html]set
of algorithms for identifying sinusoids in data[/url]. Some of them (e.g., [url=http://www.mathworks.com/access/helpdesk/help/toolbox/signal/index.html?/access/helpdesk/help/toolbox/signal/rootmusic.html&http://www.mathworks.com/cgi-bin/texis/webinator/search/]rootmusic[/url])
take the number of sinusoids to find as an argument and return the "most probable N frequencies." These could be useful in line monitoring. |
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Mon Dec 3 19:06:49 2007, rana, DAQ, Computer Scripts / Programs, linemon
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I turned up my nose at Matlab's special tools. I modified the linetracker to use the
relationship [U][B]phase = 2*pi*f*t[/B][/U] to estimate the frequency each minute. The
code uses 'polyfit' to get the mean and trend of the unwrapped phase and then determines
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Mon Dec 3 19:44:58 2007, Accelerometers on new mounts, Configuration, PEM, Andrey
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I (Andrey) continued today working with new accelerometer mounting. (see entry #151 about my Friday work).
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Wed Nov 28 21:51:52 2007, tobin, Configuration, PSL, ISS
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I replaced the front-end differential receivers for the ISS's "inner-loop" sensor and monitor diode inputs with lower-noise [url=http://focus.ti.com/docs/prod/folders/print/ths4131.html]THS4131[/url]'s
(formerly THS4151's). I verified operation by taking the transfer function from the "PD+" and "PD-" inputs (separately) to the testpoint following the
differential receiver; the surgery appears successful.
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Thu Nov 29 15:17:53 2007, rob, Configuration, PSL, ISS
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I put some ISS beam on the diode on the PSL table. In the previous layout, this was the monitor diode (and it's labeled monitor) but I plugged it into
the sensor jack anyways so we can run with the loop closed for now; we can just switch the cables later. The reason the beam was unclear is because someone |
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Mon Dec 3 22:20:09 2007, tobin, Configuration, PSL, ISS
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I replaced the painfully short 1' cables on the ISS photodiodes with luxurious five foot cables, made by chopping a ten foot Amphenol cable (P/N:CS-DSPMDB09MM-010)
in half and using each half for one of the diodes. All of the ISS GND connections are wired to the PD GND, as is the PD- differential signal. The diodes
are installed on the PSL table, but I have not tested them beyond looking at the DC values as I blocked/unblocked the beam. |
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Wed Dec 5 10:57:08 2007, alberto, HowTo, Computers, Connecting the GPIBto USB interface to the Dell laptop
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| The interface works only on one of the USB ports of the laptop (the one on the right, looking at the computer from the back). |
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Wed Dec 5 13:49:08 2007, alberto, Update, Electronics, RF AM PD lines monitor
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In the last weeks I’ve been working on the design of an electronic board to measure directly the power of the main spectral lines on of the RF-AM photodiode
from as many independent outputs. The idea is to have eventually a monitor channel in the CDS network for the power of each line.
Looking at at the spectrum from the RF-AM PD (see attached plot), there are 5 main lines:
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Wed Dec 5 16:57:36 2007, tobin, HowTo, Computer Scripts / Programs, SR785 data converter on linux
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I was pleased to find that the SR785 Data Viewer (including the command line conversion utility) installs and works in linux using WINE (on my laptop at
least). There are some quirks, of course, but I was able to extract my data. |
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Wed Dec 5 18:08:36 2007, Andrey, Update, ASC, Optical Lever laser for ETMX is installed
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A new laser with \lambda=633nm has been intalled and the mirror adjusted so that the signal hits the center of the photodetector.
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Wed Dec 5 19:25:07 2007, rana, DAQ, CDS, DMF
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I made a database file on C1AUX called dmf.db. It has 9 DMF EPICS channels which are also trended
so that one can now write data to those channels from a DMF Monitor and the data will be records.
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Wed Dec 5 23:19:03 2007, Andrey, Configuration, PEM, Accelerometers are turned on 7x
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All accelerometers have been turned on, as Alan asked during Wednesday meeting.
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Thu Dec 6 15:21:59 2007, alberto, Frogs, Electronics, RF Transfer Function of Stiff Aluminum Wires
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| Transfer function of 3cm long Aluminum wires and of 3cm stranded wires |
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Thu Dec 6 15:22:42 2007, Andrey, Summary, Electronics, Pictures of the inside of He-Ne laser
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Steve gave me an old "dead" He-Ne laser that long time ago was used for ETMX optical lever.
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Thu Dec 6 18:11:15 2007, rob, HowTo, Computer Scripts / Programs, Making DMF monitors
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I was able to use the matlab compiler to compile a version of the [B]linetracker[/B] written by Rana, and run the compiled version on mafalda.
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Thu Dec 6 19:19:47 2007, Andrey, Configuration, SUS, Suspension damping Gain was restored
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Suspension damping gain was disabled for some reason (all the indicators in the most right part of the screen C1SUS_ETMX.adl were red), it is now restored. |
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Fri Dec 7 00:02:26 2007, rana, Summary, IOO, MC/FSS Frequency Noise
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[U][B]The FSS frequency noise is not very bad.[/B][/U]
I compared the MC_F spectra between Hanford and the 40m using DTT and its 'User NDS' option.
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Fri Dec 7 11:33:24 2007, waldman, Omnistructure, OMC, PZT wiring
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The 2 pin LEMO connector has got an unmarked pin and a pin marked by a white half-circle.
The unmarked pin is connected to the side of the PZT attached to the mirror.
The marked pin is connected to the side of the PZT attached to the tombstone. |
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Fri Dec 7 14:14:48 2007, rob, Metaphysics, Computer Scripts / Programs, tdsread problems on Solaris
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[COLOR=darkblue]tdsread[/COLOR] has developed a strange new illness, whereby it cannot read EPICS values from [COLOR=red]two subsystems at once[/COLOR]
(e.g., getting an LSC and SUS value simultaneously). I thought this might have something to with the fact that both [COLOR=purple]losepics[/COLOR] and |
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Fri Dec 7 18:28:30 2007, tobin, Update, Computer Scripts / Programs, compiled matlab hoses itself
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Andrey pointed out to me that some matlab functions in the Signal Processing Toolbox were dying with errors. Looking into the .m file (identified using
the "which" command), I was surprised to see binary garbage rather than glistening, clear Matlab prose. Then I noticed the directory in which it was finding
the .m file:
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Fri Dec 7 18:31:30 2007, tobin, Update, Computer Scripts / Programs, compiled matlab hoses itself
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Addendnum. The reason the linemon_mcr command was in the path was because of the user issuing the command "addpath(genpath(pwd))" where genpath(D) "returns
a path string starting in D, plus, recursively, all the subdirectories of D."
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