 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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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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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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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 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 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 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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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. |
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Mon Nov 19 14:19:25 2007, steve, Omnistructure, PEM, jackhammer
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The construction personal successfully jackhemmered a fence around the "Drever's parking slot"
There is no parking space available close by |
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Fri Nov 16 18:46:49 2007, steve, Bureaucracy, PSL , MOPA was turned off & on
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The "Mohana" boys scouts and their parents visited the 40m lab today.
The laser was turned off for their safety.
It is back on ! |
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Fri Nov 16 14:31:43 2007, tobin, Update, Computers, op140 disks
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| Phil Ehrens stopped by and took op140's disks. |
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Fri Nov 16 14:11:26 2007, tobin, Update, Computers, op140
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| Alan called to say that Phil Ehrens will be coming by to take [b]op140[/b] off our hands. |
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Fri Nov 16 11:27:18 2007, tobin, Update, Computers, script fix
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I added a tidbit of code to "LIGOio.pm" that fixes a [url=http://lhocds.ligo-wa.caltech.edu:8000/40m/EZCA]problem with ezcastep on Linux[/url]. Scripts
such as "trianglewave" will now work on Linux.
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Thu Nov 15 18:06:06 2007, tobin, Update, Computers, alex: linux1 root file system hard disk's dying
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I just noticed that Alex made [url=http://www.ldas-sw.ligo.caltech.edu/ilog/pub/ilog.cgi?group=40m&date_to_view=11/14/2007&anchor_to_scroll_to=2007:11:14:20:00:29-aivanov]an
entry in the old ilog[/url] yesterday, saying: "[color=red][b]Looks like linux1 root filesystem hard drive is about to die. The system log is full of drive
seek errors. We should get a replacement IDE drive as soon as possible or else the unthinkable could happen.[/b][/color] 40 Gb IDE hard drive will be |
 Thu Nov 15 18:37:06 2007, tobin, Update, Computers, possible replacement for linux1's disk
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It looks like the existing disk in linux1 is a Seagate ST380013A (this can be found either via the smartctl utility or by looking at the file /proc/ide/hda/model).
It appears that you can [url=http://www.amazon.com/Seagate-ST380013ARK-Internal-Barracuda-Ultra/dp/B0000A576G/ref=pd_bbs_sr_6?ie=UTF8&s=electronics&qid=1195180463&sr=8-6]still
buy this disk from amazon[/url], though I think just about any ATA disk would work. I'll ask Steve to buy one for us. |
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Thu Nov 15 18:36:48 2007, John, Summary, , PSL table work
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| I've rotated the lambda/2 plate to 340deg (from 6 deg) and blocked one arm of the Mach-Zender. Undo both if you need to. |
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Thu Nov 15 18:23:55 2007, John, HowTo, Computers, Swap CAPS and CTRL on a Windows 2000/XP machine
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I've swapped ctrl and caps on the four control room Windows machines. Right ctrl is unchanged.
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Thu Nov 15 17:09:37 2007, pkp, Update, OMC, Vertical Transfer functions with no cables attached.
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[Norna Pinkesh]
The cables connecting all the electronics ( DCPDs, QPDs etc) have been removed to test for the vertical transfer function. Now the cables are sitting on |
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Thu Nov 15 04:18:11 2007, John, Summary, PSL, PMC cavity pole measurements
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In connection with our work on the ISS I attempted to measure the PMC cavity pole.
I swept the PMC PZT and looked at the transmission through the cavity on the ISS Monitor diode (which is now back on the table, feel free to remove it |
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Wed Nov 14 12:47:19 2007, tobin, Update, PSL, ISS
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John, Tobin
With John's notch filter installed and the increased light on the ISS sensing diode, we were able to get a UGF of about 60 kHz with the gain slider set |
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Wed Nov 14 17:50:00 2007, tobin, Update, PSL, ISS
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Here's the current wiring between the ISS and its PDs:
[table border="1"]
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Wed Nov 14 16:54:54 2007, pkp, Update, OMC, Much better looking vertical transfer functions
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[Norna Pinkesh]
So after Chub did his wonderful mini-surgery and removed the peek from the cables and after Norna and I aligned the whole apparatus, the following are |
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Wed Nov 14 12:33:35 2007, tobin, AoG, Environment, construction
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| The construction crews are running a jack-hammer right outside of the control room. |
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Wed Nov 14 07:48:38 2007, norna, Omnistructure, OMC, OMC Cable dressing
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[Snipped from an email]
1) Last Friday Pinkesh and I set the OMC up with only the top three OSEMs and took a vertical transfer function. We had removed the other OSEMs due to |
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Tue Nov 13 14:33:40 2007, John, Update, PSL, ISS filter
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The transfer function from 'In Loop Error Point Monitor' to TP3 the filter out test point on the ISS board.
-33dB at 3.715MHz. |
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Mon Nov 12 15:18:34 2007, rob, Update, PSL, ISS
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After John soldered a 3.7 MHz notch filter onto the ISS board, I took a quick TF and RIN measurement. The out-of-loop RIN is attached, including a dark
noise trace, and with the gain slider at 10dB. The UGF is 35kHz with a phase margin of 30deg. John is currently doing a more thorough inspection, and |
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Mon Nov 12 23:44:19 2007, John, Update, PSL, ISS
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[quote]
After John soldered a 3.7 MHz notch filter onto the ISS board, I took a quick TF and RIN measurement. The out-of-loop RIN is attached, including a dark
noise trace, and with the gain slider at 10dB. The UGF is 35kHz with a phase margin of 30deg. John is currently doing a more thorough inspection, and |
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Fri Nov 9 21:36:14 2007, rob, Configuration, PSL, FSS
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rob, rana
We looked at the FSS a bit today. The most we could get out of it with the gain sliders was a UGF of around 95kHz. After a bit of tweaking the waveplate |
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Mon Nov 12 15:05:49 2007, rob, Configuration, PSL, FSS
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Spent a bit of time fiddling with the FSS again today. In a not-particularly-systematic manner, I raised the input-side of the 21.5MHz PC, adjusted the
half-wave plate in front of it, touched up the RC alignment and the alignment onto the transmitted and reflected diodes. This got us a ~15% increase in |
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Mon Nov 12 14:09:19 2007, rob, DAQ, General, tpman dead on fb40m
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The testpoint manager was dead on fb40m. I know I re-started it sometime after the power outage, so something must have killed it. If you get an error
from DTT like
"diagnostic kernel does not support: testpoints", then log into fb40m as root, check for the tpman with a [U][B]ps -ef | grep tpman[/B][/U]. If it's not |
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Mon Nov 12 10:53:58 2007, pkp, Update, OMC, Vertical Transfer functions
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[Norna Sam Pinkesh]
These plots were created by injected white noise into the OSEMs and reading out the response of the shadow sensors ( taking the power spectrum). We suspect |
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Thu Nov 8 18:44:01 2007, tobin, Configuration, PSL, ISS
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Tobin, Rob
With the Sense PD blocked, I adjusted the offset trim of the fourth stage in the ISS servo until the current shunt signal was zeroed. After this adjustment, |
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Fri Nov 9 17:33:33 2007, rob, Configuration, PSL, ISS
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The 3.7 MHz is actually on the light. It's the beat between the 29.5 MHz sidebands and the 33.2 MHz sidebands. There are pads in the ISS PCB for a filter
to notch this frequency--John is working on it.
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Fri Nov 9 09:37:55 2007, steve, Update, PSL, head temp hiccup
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Just an other PSL-126MOPA_HTEMP hiccup.
The water chiller is at 20.00C |
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Fri Nov 9 00:23:12 2007, pkp, Update, OMC, X and Z resonances
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I got a couple of resonance plots going for now. I am still having trouble getting the Y measurement going for some reason. I will investigate that tommorow.
But for tonight and tommorow morning, here is some food for thought. I have attached the X and Z transfer functions below. I compared them to Norna's plots
- so just writing out what I was thinking -
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Fri Nov 9 00:01:24 2007, waldman, Omnistructure, OMC, OMC mechanical resonances (Tap tap tappy tap) 7x
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[Pinkesh, Aidan, Sam]
We did a tap-tap-tappy-tap test of the OMC to try to find its resonances. We looked at some combination of the PDH error signal and the DCPD signal in |
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Thu Nov 8 15:57:53 2007, tobin, Configuration, PSL, shelf removed
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I removed the sheet metal shelf from the PSL enclosure, for easier access to the ISS.
ISS investigations ongoing. |
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Thu Nov 8 11:40:21 2007, steve, Update, PEM, particle counts are up
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I turned up the psl HEPA filter to 100%
This 4 days plot shows why |
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Thu Nov 8 00:55:44 2007, pkp, Update, OMC, Suspension tests 9x
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[Sam , Pinkesh]
We tried to measure the transfer functions of the 6 degrees of freedom in the OMS SUS. To our chagrin, we found that it was very hard to get the OSEMs |
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Wed Nov 7 16:07:03 2007, steve, Update, PSL, PSL & IOO trend
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| 1.5 days of happy psl-ioo with litle bumps in C1:PSL-126MOPA_HTEMP |
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Wed Nov 7 14:05:59 2007, tobin, Configuration, IOO, MC ringdown
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Modeling the mode cleaner as a simple cavity with all losses lumped together, we expect the cavity power to be
attenuated by a factor (1-L) after each interval (2l/c)=1/fsr. Therefore we can get the cavity loss L
(including power lost through transmission) from the ringdown time constant tau as:
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Wed Nov 7 14:01:31 2007, waldman, Omnistructure, OMC, Frequency and Intensity noise
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One of the biggest problems I had using the PZT to lock was excessive noise. I did a little noise hunting and found that the problem was the cable running
from the rack to the laser fast input. As a reminder, the laser has a 4 MHz / volt fast input. We require about 300 MHz to go one FSR, so there is
a Thorlabs HV box between at the NPRO fast input which takes 0-10 V -> 0-150 V. The 150 V HV range is worth about 600 MHz of NPRO frequency.
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Wed Nov 7 13:54:44 2007, rob, Configuration, IOO, Mode Cleaner transfer function
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I performed the same procedure described [url=http://dziban.ligo.caltech.edu:40/40m/40] here[/url], and re-measured the transfer function of the mode cleaner
to see the effect of the drag-wiping. The results are attached in a pdf. We don't seem to have done any damage, but the improvements are barely measurable.
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Wed Nov 7 10:55:21 2007, ajw, Configuration, Computers, backup script restarted
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Following the reboot of computers on 10/31/07, the backup script required restart (which unfortunately "can't" be automated because a password needs to
be typed in). I restarted, following the instructions in /cvs/cds/caltech/scripts/backup/000README.txt and verified that it more-or-less worked last night
(the rsync sometimes times out; it gets through after a couple of days of trying.) |
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Wed Nov 7 09:38:01 2007, steve, Update, VAC, rga scan
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| pd65-m-d2 at cc1 6e-6 torr |
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Wed Nov 7 02:14:08 2007, Andrey, Bureaucracy, IOO, More information about MC2 ringdown 9x
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As Tobin wrote two hours ago, we (Andrey, Tobin, Robert) made a series of ringdown measurements for MC2
in the spirit of the measurement described by Rana -> see
entry from Mon Oct 29 23:47:29 2007, rana, Other, IOO, MC Ringdowns.
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Wed Nov 7 00:51:33 2007, andrey, rob, tobin, Configuration, IOO, MC ringdowns
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| We completed several ringdown measurements this afternoon; Andrey is currently processing the data. |
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Tue Nov 6 16:48:54 2007, tobin, Configuration, Computers, scopes on the net
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I configured our two 100 MHz Tektronix 3014B scopes with IP addresses: 131.215.113.24 ([url=http://scope0/]scope0[/url]) and 113.215.113.25 ([url=http://scope1/]scope1[/url]).
Let the scripting commence!
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Tue Nov 6 23:45:38 2007, tobin, Configuration, Computers, tektronix scripts!
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I cooked up a little script to fetch the data from the networked Tektronix scope. Example usage:
[FONT=Courier]linux2:scripts>[b]tektronix/tek-dump scope0 ch1 foo.csv[/b][/FONT]
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Tue Nov 6 18:18:15 2007, tobin, Configuration, Computers, I broke (and fixed) conlogger
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It turns out that not only restart_conlogger, but also conlogger itself checks to see that it is running on the right machine. I had [url=http://dziban.ligo.caltech.edu:40/40m/32]changed
the restart_conlogger script[/url] to run on op340, but it would actually silently fail (because we cleverly redirect conlogger's output to /dev/null).
Anyway, it's fixed now: I edited the conlogger source code where the hostname is hardcoded (blech!) and recompiled.
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Tue Nov 6 15:37:34 2007, rob, Configuration, SUS, rampdown script
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/cvs/cds/caltech/scripts/SUS/rampdown.pl is now in the crontab for op340m, running every half-hour at 15&45. It checks the suspension watchdog trip levels,
and reduces them by 20 if they are above 150. |
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Tue Nov 6 15:36:03 2007, rob, Update, LSC, XARM locked
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Easily, after resetting the PSL Uniblitz shutters. There's no entry from David or Andrey about the recovery from last week's power outage, in which they
could have indicated where the procedure was lacking/obscure. Tsk, tsk. |
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Tue Nov 6 14:51:03 2007, tobin, rob, Update, IOO, Mode cleaner length
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Using the Ward-Fricke variant* of the [url=http://ilog.ligo-wa.caltech.edu/ilog/pub/ilog.cgi?group=detector&date_to_view=02/14/2004&anchor_to_scroll_to=2004:02:15:00:06:50-daniel]Sigg-Frolov
method[/url], we found the length of the mode cleaner to be [b]27.0934020183 meters[/b], a difference of [b]-2.7mm[/b] from [url=http://www.ldas-sw.ligo.caltech.edu/ilog/pub/ilog.cgi?group=40m&date_to_view=08/28/2007&anchor_to_scroll_to=2007:08:29:18:40:12-kawabe]Andrey,
Keita, and Rana's measurement on August 30th[/url].
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Tue Nov 6 10:42:01 2007, rob, Configuration, IOO, mode cleaner locked
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Increased the power exiting the PSL by turning the half-wave plate after the MOPA, opened the PSL shutter, and aligned the mode cleaner to the input beam.
It wasn't that hard to find the beam with the aperture open all the way on the MC2 camera. The transmitted power is now 2.9 arbitrary units, while the
input power is 1.2 arbitrary units. Not sure yet if that's an increase or decrease in efficiency, since no one posted numbers before the vent. Also turned |
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Tue Nov 6 09:45:22 2007, steve, Summary, SUS, vent sus trend
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The mc optics dragwippings were done by locking optics by eq stops and rotating-moving
cages so access were good. This technic worked well with mc1 & mc2
MC3 osems were reoriented only. |
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Tue Nov 6 09:14:37 2007, steve, Summary, VAC, pump down 65
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8 hr plot,
precondition: 5 days at atm,
vent objective: drag wiping mc1, mc2 & mc3 accomplished,
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