 Thu Feb 16 13:12:30 2012, rana, Update, LSC, sensing matrix of PRMI
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Quote:
I think I have told a lie in the last meeting -- the measured sensing matrix doesn't look similar |
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Fri Feb 17 04:45:48 2012, kiwamu, Update, LSC, sensing matrix of PRMI
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I locked the PRMI with the AS55I and Q combination.
It seems the glitche rate decreased,
but I am not 100 % sure because the rest of the demod signals (i.e. REFL11 and etc) were showing relatively big signals (noise ?), which may cover |
 Wed Mar 23 05:11:08 2011, kiwamu, Update, Green Locking, servo handig off 
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Succeeded in handing off the servo from the green to the red.
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Wed Mar 23 08:50:36 2011, Aidan, Update, Green Locking, servo handig off
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Nicely done!
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Sun Sep 22 21:28:53 2013, rana, Update, SUS, set OL T RAMP values (they are not visible on the OL screens)
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controls@rosalba:/opt/rtcds/caltech/c1/scripts/SUS 0$ ./setOLtramps
Old : C1:SUS-ETMX_OLPIT_TRAMP 0
New : C1:SUS-ETMX_OLPIT_TRAMP 2 |
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Tue Jul 9 11:37:37 2013, gautam, Update, CDS, set up for testing DAC Interface-board pin outs
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The bank marked channel 9-16 is free, but the connector is a 40 pin IDC and I need to know the exact pin-out configuration before I can set about making
the custom ribbon cable that will send the control signals from the DAC card to the PZT driver board.
The DAC interface board on rack 1Y4 seems to be one of the first versions of this board, and has no DCC number anywhere on it. Identical modules |
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Tue Jul 9 12:01:20 2013, gautam, Update, CDS, set up for testing DAC Interface-board pin outs
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Jenne just rebooted c1scy and daqd on the framebuilder. We will do the actual test after lunch. |
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Thu Aug 12 11:59:31 2010, kiwamu, HowTo, CDS, set up ntp daemom
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(sad story)
When I was working on a new front end machine c1sus, I found that make command didn't run and gave the following message.
" |
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Tue Apr 28 16:36:24 2009, rob, HowTo, Locking, setting the RF CARM demod phase
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To set the demod phase for RF CARM, sensed at REFL2 (REFL 166I), it suffices to set the demod phase for REFL2 to be the optimal phase for controlling
SRCL in a no-arm state. |
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Tue Apr 28 17:51:13 2009, rob, HowTo, Locking, setting the RF CARM demod phase
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Quote:
To set the demod phase for RF CARM, sensed at REFL2 (REFL 166I), it suffices to set the demod phase for REFL2 to be |
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Thu Sep 30 18:51:50 2010, yuta, Update, Computers, setting up aldabella and mariabella
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(Kiwamu, Yuta)
Background: |
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Mon Nov 6 09:09:43 2017, Steve, Update, VAC, setting up new TP2 turbo
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Our new Agilent Technology TwisTorr
84FS AG rack controller ( English Manual pages 195-297 ) RS232/485, product number X3508-64001, sn IT1737C383
This controller, turbo and |
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Thu Nov 11 05:56:04 2010, yuta, Summary, IOO, setting up temporary oplev for coil balancing of MCs
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(Suresh, Yuta)
Background: |
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Sun Oct 24 18:06:35 2010, kiwamu, Summary, Locking, setup for green beat
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(notes on signal level) |
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Mon Oct 25 02:14:38 2010, Koji, Summary, Locking, setup for green beat
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- What is the actual photocurrent for the beam1 and beam2? We don't care how much power do you have before the BS, but care how much current do you have
on the PD.
- How much is the visibility? There is mismatching of the beams. i.e. The beam diameter looked quite different. Also the beams are not TEM00 but |
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Tue Jul 8 10:26:30 2008, Masha, Update, Auxiliary locking, setup updates
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Yesterday I changed one of the beam splitters in the Mach Zehnder to one with a more stable mount as to reduce the system's coupling to environmental noise.
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Mon Oct 4 19:48:00 2010, yuta, Update, VAC, several mirrors installed to ITMX/BS chamber
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(Koji, Kiwamu, Yuta)
Lots of progress for the optics placement in the vacuum chamber. |
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Tue Jan 28 08:26:53 2020, rana, Frogs, PEM, shaking
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https://breakthrough.caltech.edu/magazine/2019-aug/#article-Listening-with-Light
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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 Jan 11 14:47:11 2018, Steve, Update, PSL, shelf work for tomorrow
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I have just received the scheduling of the PSL self work for tomorrow. Gautam and I agreed that if it is needed I will shut the laser off and cover the
hole table with plastic. |
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Fri Aug 3 13:05:28 2012, Den, Update, PEM, shims
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As we do not have legs for Trillium, I was advised to use shims to adjust the levels. However, they produce extra resonance at ~30 Hz + harmonics. Coherence
is lost at these frequencies.
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Fri Aug 3 14:52:11 2012, Jenne, Update, PEM, shims
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Quote:
As we do not have legs for Trillium, I was advised to use shims to adjust the levels. However, they produce extra resonance at ~30 Hz + harmonics. |
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Wed Aug 18 12:24:58 2010, josephb,kiwamu, Update, CDS, shmem issue
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Apparently its possible to have working models get into a bad state in regards to shared memory, which prevents the model from working after killing
it and restarting it. We found that by shutting all the models down, and then killing and restarting the setup_shmem process, it allowed models to
function properly again. |
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Tue Dec 4 10:44:36 2012, Steve, Update, PEM, short power outage
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CALIFORNIA
INSTITUTE OF TECHNOLOGY |
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Mon Sep 30 13:20:55 2019, aaron, Update, IOO, shot noise measurement
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I wanted to measure the RF transimpedance of the WFS heads, as outlined above.
Summary: Measurement is not done.
Details: |
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Wed Aug 31 11:37:56 2011, steve, Update, Green Locking, shutter in place at east end
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| Uniblitz mechanical shutter installed in the green beam path at ETMY-ISCT The remote control cable has not been connected. |
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Wed Oct 30 14:58:44 2013, Steve, HowTo, General, shutting down a computer
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We have tried to ssh into c1iscey yesterday morning. It just did not work. We have just tried it again (now) and it did work.
Lesson learned: always shut |
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Mon Oct 3 04:43:03 2011, kiwamu, Update, LSC, sideband-resonance PRMI locked
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My goal of today was to lock PRMI without using AS55 and it is 50% successful.
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Sat Feb 26 02:33:16 2011, kiwamu, Update, Green Locking, sidebands on beatnote
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The power ratio of
the beatnote signal vs. the 216kHz sideband has been measured.
The measured ratio was -55 dB, which is smaller by about 20 dB than Aidan's |
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Sun Feb 27 09:43:59 2011, Aidan, Update, Green Locking, sidebands on beatnote
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Can we set up a fiber-PD on the end table to look at the beat between the "end laser IR beam" and the "PSL IR beam fiber-transmitted end
beam"?
We should see the same thing on that PD that we see on the green PD (plus any fiber noise and I'm not really sure how much that'll be off the top |
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Sun Feb 27 13:09:56 2011, rana, Update, Green Locking, sidebands on beatnote
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When Koji and I were massaging the MC, we noticed that the oscillations were at 48.5 kHz. They were pretty huge and are probably what you're seeing on
the beat. My guess is that they are the PZT resonances of the PSL 2W NPRO; we need to put a notch in the FSS box - it still has the notch from the old
NPRO. |
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Thu Apr 1 20:29:02 2010, Hartmut, Update, Green Locking, simple PD test circuit
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I made a simple PD test circuit which may allow to test PD response up to few 100MHz.
Its not for low noise, only for characterising PD response.
Here is the circuit: |
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Thu Jun 3 22:33:31 2010, valera, Summary, CDS, simulated plant work
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I put matlab files and a summary into the 40m wiki for the fitting of the 40m Optickle transfer functions and generating digital filters for the
simulated plant:
http://lhocds.ligo-wa.caltech.edu:8000/40m/Generating_DOF-%3EPD_digital_filters_based_on_Optickle_modeling |
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Tue Jun 26 01:30:13 2012, yuta, Summary, Green Locking, simultaneous hold and release of the arm (aka two arm ALS)
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To get the feeling of the master of IFO, I;
1. Stabilized both arm length using ALS. |
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Wed Mar 9 17:29:11 2011, steve, Summary, VAC, single O-ring protection
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We have one single O-ring on the 40m vacuum envelope. It is on the OOC west side, facing the AP table. This O-ring has to be protected from the force
of this
door. There should be 3 shims ~120 degrees apart to carry the full load, so it is not the O-ring that is getting squashed. |
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Tue Nov 29 22:54:49 2011, Den, Update, digital noise, single precision
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In the previous elog we've proved that signals C1:SUS-MC3_LSC_EXCMON and C1:SUS-MC3_LSC_OUTMON are in single precision. Now we try to understand
if the precision is lost when the signals enter dtt tools or in the online code. For this measurement we just switch on one of the filters between the
signals. By this we add mathematical operations inside the online code. If double precision is used there, then we'll see the same error as before, because |
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Wed May 30 18:16:44 2012, Jamie, Update, LSC, skeleton of new c1cal calibration model created
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[Jamie, Xavi Siemens, Chris Pankow]
We built the skeleton of a new calibration model for the LSC degrees of freedom. I named it "c1cal". It will run on the c1lsc
FE machine, in CPU slot 4, and has been given DCUID 50. |
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Tue Jul 1 21:27:27 2008, rob, HowTo, Computer Scripts / Programs, slider twiddling after reboot
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Sometimes after we reboot the front-end machines, some of the hardware gets stuck in an unknown state. We generally fix this by twiddling EPICS settings,
which refresh the hardware somehow and put it into a known state. I've started a script ([B]slider_twiddle[/B]) which we can just run after reboots to |
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Thu Apr 17 16:59:45 2014, jamie, Update, CDS, slightly more successful attempt to get Dolphin working on c1ioo
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So it turns out that the card that Rolf had given me was not a Dolphin host adapter after all. He did have an actual host adapter board on hand,
though, and kindly let us take it. And this one works!
I installed the new board in c1ioo, and it recognized it. Upon boot, the dolphin configuration scripts managed to automatically recognize |
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Fri Oct 15 15:32:35 2010, josephb, Update, CDS, slow DAQ channels added
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I added all the _OUT16, _INMON, _EXCMON channels associated with the BS, ITMX, and ITMY channels in SUS_SLOW.ini
in the /opt/rtcds/caltech/c1/chans/daq directory. Similarly, I added the channels associated with MC1, MC2, and MC3 to MCS_SLOW.ini and those associated
with PRM and the SRM to RMS_SLOW.ini. |
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Mon Oct 18 08:44:36 2010, rana, Update, CDS, slow DAQ channels added
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Why EXCMON? I think that we should modify the filter coefficients so that the decimation filter that makes OUT16 is a 2nd order Butterworth at
1 Hz instead of whatever bogus thing it is now. Then we can delete the EXCMON from the DAQ and add either OUTPUT or OUTMON. That way we will have a low
frequency signal (OUT16) and a sort of aliased RMS (OUTMON). |
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Thu Jul 5 01:20:58 2012, yuta, Summary, CDS, slow computers, 0x4000 for all DAQ status
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ALS looks OK. I tried to lock FPMI using ALS, but I feel like I need 6 hands to do it with current ALS stability. Now I have all computers being so slow.
It was fine for 7 hours after Jamie the Great fixed this, but fb went down couple times and DAQ status for all models now shows 0x4000. I tried |
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Wed Jan 25 14:30:20 2017, gautam, Update, CDS, slow machine bootfest
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[gautam, lydia]
We rebooted c1psl, c1iscaux and c1aux
which were all showing the typical symptom of responding to ping but not to telnet (and also blanked out epics fields on the MEDM screens). Keyed all these |
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Fri Jan 27 17:07:52 2017, Lydia, Update, CDS, slow machine bootfest
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Rebooted c1iscaux, c1auxex and c1auxey which were all not reponding to telnet. The watchdogs for the ETMs were turned
off and then I keyed all 3 crates. All slow machines are reponding to telnet now. Both green lasers locked to the arms so I didn't do any burt restore. |
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Mon Feb 6 15:18:08 2017, gautam, Update, CDS, slow machine bootfest
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| Had to reboot c1psl, c1susaux, c1auxex, c1auxey and c1iscaux today. PMC has been relocked. ITMX didn't get stuck. According |
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Thu May 25 12:22:59 2017, gautam, Update, CDS, slow machine bootfest
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After ~3months without any problems on the slow machine front, I had to reboot c1psl,
c1susaux and c1iscaux today.
The control room StripTool traces were not being displayed for all the PSL channels so I ran |
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Thu Jun 1 15:37:01 2017, gautam, Update, CDS, slow machine bootfest
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Steve alerted me that the IMC wouldn't lock. Reboots for
c1susaux, c1iool0 today. I tried using the reset button instead of keying the crates. This worked for c1iool0,
but not for c1susaux. So I had to key the latter crate. The machine took a good 5-10 minutes before coming back up, but eventually it did. Now IMC locks |
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Mon Jun 12 10:34:10 2017, gautam, Update, CDS, slow machine bootfest
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Reboots for c1susaux, c1iscaux, c1auxex
today. I took this opportunity to squish the Sat. Box. Cabling for MC2 (both on the Sat box end and also the vacuum feedthrough) as some work
has been recently ongoing there, maybe something got accidently jiggled during the process and was causing MC2 alignment to jump around. |
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Fri Jun 16 13:53:11 2017, gautam, Update, CDS, slow machine bootfest
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Reboots for c1psl, c1iool0, c1iscaux
today. MC autolocker log was complaining that the C1:IOO-MC_AUTOLOCK_BEAT
EPICS channel did not exist, and running the usual slow machine check script revealed that these three machines required reboots. PMC was relocked, IMC |
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Wed Jul 5 16:09:34 2017, gautam, Update, CDS, slow machine bootfest
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Reboots for c1susaux, c1iscaux
today.
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