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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Category Subject Text Attachments
  81   Sat Aug 13 11:17:17 2016 GabrieleFacilityDaily ProgressSpot the differences   2016-08-11_14.52.04.jpg2016-08-13_11.07.38.jpg 
  80   Fri Aug 12 10:33:14 2016 GabrieleElectronicsConfigurationStorage added to cymac3Installed two new 2TB disks into the cymac3.
Also, the main disk has a 1TB partition with
the operating system, so I created a new
  
  79   Thu Aug 11 10:59:39 2016 GabrieleElectronicsConfigurationQuadrant calibrationI cross checked the calibration of the
sum channel with a  power meter. Now
all quadnant signals X3:Q?_OUT and the sum
  
  78   Thu Aug 11 09:10:01 2016 GabrieleElectronicsConfigurationReal time modelCompiled and installed an updated real
time model. It acquires the four QPD segments,
compute sum and differences, and normalize.
 model1.pngmodel2.pngmain_medm.png 
  77   Thu Aug 11 08:45:19 2016 GabrieleGeneralGeneralQPD signals with dielectric filterI installed a dielectric laser line filter
(Thorlabs FLH05633-5, center wavelength 633
nm, FWHM 5 nm) in front of the QPD. In this
 filter.pngqpds.png 
  76   Wed Aug 10 10:04:35 2016 GabrieleMechanicsDaily ProgressThe prototype of the disk retain system is hereYesterday we received the prototype of
the disk suspension and retain system. Everything
looks good. I checked that the disk fits
 6x 
  75   Wed Aug 10 09:39:38 2016 GabrieleElectronicsDaily ProgressAnnuntio vobis gaudium magnum: habemus CymacYesterday I cloned the cymac2 disk and
installed it into the cymac3.

Jamie tweaked a few things (I can't
 qpd_spectra.png 
  74   Mon Aug 8 10:42:46 2016 GabrieleGeneralGeneralDependency of eigenmode frequencies on thickness and diameterI ran a set of COMSOL simulations to determine
the dependency of the frequency of each eigenmode
on the disk thickness and diameter, within
 26x 
  73   Tue Aug 2 16:00:32 2016 GabrieleElectronicsCharacterizationMore on the signal jumpsSo I’m
sending a 1.123 Hz sinusoid into the ADC,
 out1.pngout2.pngout3.png 
  72   Tue Aug 2 15:58:12 2016 GabrieleElectronicsDaily ProgressSix QPD functional and testedI finished populating the new four QPD
boards, and fixed the first one I populated
weeks ago. I tested all five new boards:
 2016-08-02_15.15.43.jpg 
  71   Mon Aug 1 16:56:57 2016 GabrieleElectronicsDaily ProgressPopulated four new QPD boardsToday I populated four more QPD boards.
All components are installed, except for
the QPD themselves.
  
  70   Fri Jul 29 14:08:31 2016 GabrieleGeneralDaily ProgressPeak tracking code for real time modelSummary

I wrote a C function
to reconstruct the amlplitude and frequency
of a line. It can be added as a block into
 simulation.pngScreen_Shot_2016-07-29_at_2.02.24_PM.pngScreen_Shot_2016-07-29_at_2.02.24_PM.png 
  69   Thu Jul 28 17:15:22 2016 GabrieleElectronicsDaily ProgressADC/DAC interfaces upgradeInstalled the ADC and DAC boards into a
proper box. Also, swapped the temporary DAC
board (with cale hack) with the final one.
 2016-07-28_17.02.46.jpg2016-07-28_17.03.11.jpg 
  68   Thu Jul 28 14:01:27 2016 AlenaGeneralDaily ProgressClean roomOrdered the clean room (hardware+hepa filters)
and vacuum gauges
  
  67   Thu Jul 28 13:58:48 2016 Alena, GabrieleCleanDaily ProgressThe old chamber is now being cleaned and bakedCleaned the chamber in the washing machine
at 40m and started 48 baking at 120 C
 20160728_092350.jpg 
  66   Wed Jul 27 15:43:02 2016 GabrieleFacilityDaily ProgressVacuum chamber dismantled and ready for cleaning[Alena, Gabriele]

As decided at out Red Door meeting,
we're going to clean the vacuum chamber
 2016-07-27_15.34.10.jpg 
  65   Wed Jul 27 11:27:11 2016 GabrieleFacilityGeneralPumps stopped and venting11:25am LT: closed valve between roughing
and turbo pumps, switched off both pumps.
Turbo pump is slowing down
 2016-07-27_12.41.26.jpg2016-07-27_12.41.30.jpg2016-07-27_12.42.21.jpg2016-07-27_12.43.24.jpg2016-07-27_12.42.12.jpg 
  64   Wed Jul 27 10:19:36 2016 GabrieleElectronicsConfigurationLast finding in the signal jump sagaThis plot shows a signal which is generated
purely digitally inside a code that I was
testing.
 glitch_with_all_digital_signal.pngpmt_cymac3.pngpmt_cymac2.png 
  63   Wed Jul 27 08:59:12 2016 GabrieleElectronicsGeneralPressure now in torrThe old channel X3:CR1-PRESSURE_LOGTORR
does not exist anymore. The new channel is
now directly in torr and it is called X3:CR1-PRESSURE_TORR.
 pressure.png 
  62   Tue Jul 26 11:45:03 2016 GabrieleElectronicsCharacterizationHigh frequency noise budgetJust to confirm that my noise estimates
make sense, here's a plot of the not-normalized
QPD signal that gives the X motion (sum and
 noise_budget.pngnoise_budget.pngnoise_budget_whitened.png 
  61   Mon Jul 25 17:44:13 2016 GabrieleElectronicsCharacterizationHigh frequency noise budgetI measured the noise sources limiting the
QPD sensitivity. Unfortunately, I had to
do some MATLAB tricks to get rid of the glitches:
 qpd_noises.pngqpd_noise_budget.png 
  60   Mon Jul 25 15:35:31 2016 GabrieleOpticsCharacterizationCalibration of the QPD in physical unitsThe
equations below are wrong. Please refer to https://nodus.ligo.caltech.edu:8081/CRIME_Lab/116
 crime_beam.PNGcrime_beam.PNGcrime_beam.PNGcalibrated_disk.png 
  59   Mon Jul 25 12:24:06 2016 GabrieleElectronicsConfigurationMore on the signal jumpsHere are two more tests I did this morning


removed the DAC card from
the cymac and the models, and restarted everything:
 no_glitches_on_cymac2_b.pngno_glitches_on_cymac2.png 
  58   Fri Jul 22 14:22:10 2016 GabrieleElectronicsConfigurationInvestigations on the signal jumps[Rolf, Ben, Rich, Gabriele]

Rolf couldn't find any good
explanation on the software side for the
 glithces.pngglitch2.png 
  57   Thu Jul 21 14:58:26 2016 GabrieleElectronicsGeneralGlitches are of digital originSo here's the final proof that the
glitches I see are digital:


There is a positive jump
 glitches_hene_table.pngglitch_hene_table_2.png 
  56   Thu Jul 21 12:10:14 2016 GabrieleGeneralDaily ProgressGlitch huntingYesterday I could clearly see the glitches
as jumps in the time domain plot of X and
Y signals, and trace them to somewhat harder
 2016-07-21_10.12.50.jpg2016-07-21_09.45.29.jpg2016-07-21_10.01.13.jpg 
  55   Wed Jul 20 10:26:40 2016 GabrieleElectronicsConfigurationAre glitches a digital artifact?Not so sure anymore...


those glitches do not happen
at regular times
I tried to send
  
  54   Tue Jul 19 20:19:38 2016 GabrieleElectronicsConfigurationGlitches are a digital artifactThe glitches I saw in the data happens
roughly every second, even though not
exactly on the second. They are suddend jumps
 glitches.pngglitches.pngjump1.pngjump2.png 
  53   Tue Jul 19 17:21:48 2016 GabrieleGeneralDaily ProgressFirst modes excited!We can't generate any arbitary signal
with the real time model, since awg is not
working properly yet. For the moment being
 excited_modes.png 
  52   Tue Jul 19 17:15:37 2016 GabrieleFacilityDaily ProgressVacuum pressure acquired[Alena, Gabriele]

We connected the analog output
of the vacuum gauge controller to one of
  
  51   Mon Jul 18 18:05:46 2016 GabrieleOpticsDaily ProgressOptical setupSmall modifications to the optical setup:


added a 1m focal lenght
lens (AR coated for 1064nm...) right before
 2016-07-18_14.33.35.jpg 
  50   Mon Jul 18 17:48:58 2016 GabrieleElectronicsConfigurationStatus of real time system and workstation[EricQ, Gabriele]

The real time system seems to be
working properly, except for the excitations:
  
  49   Mon Jul 18 17:46:04 2016 GabrieleGeneralDaily ProgressFirst look at QPD signalsHere's the first spectrum of the QPD
X and Y signals, acquired with the digital
system. Roughing and turbo pumps are still
 Screenshot.png 
  48   Mon Jul 18 14:29:07 2016 GabrieleGeneralDaily ProgressStatus of the test setupI checked that the QPD electronics works
as expected, and that I can acquire the signals
using the ADCs. A new model (x3cr1) is up
 qpd_xy_sum.pngmodel.png 
  47   Mon Jul 18 13:42:46 2016 GabrieleElectronicsCharacterizationQPD signal conventionThe QPD quadrants are wired accoridng to
the following convention
 qpd.png.pngScreenshot-Untitled_Window.png 
  46   Mon Jul 18 13:39:45 2016 GabrieleFacilityDaily ProgressPump down startedToday at 1:40pm pressure is 8.5e-7 Torr




  
  45   Sat Jul 16 14:15:44 2016 GabrieleFacilityDaily ProgressPump down startedFollowing Alena's
procedure, at about 1:30pm LT I started
the chamber pump down. At 14:15pm LT the
  
  44   Fri Jul 15 17:56:50 2016 GabrieleGeneralDaily ProgressQPD connected to digital systemI connected the QPD to the ADC interface
with a temporary cable running on the floor.

I could get signals. I still have
  
  43   Fri Jul 15 16:05:07 2016 GabrieleElectronicsDaily ProgressElectrostatic actuator installedUsing the already installed high voltage
feedthrough, I cabled one of the electrostatic
actuators (1mm gap between electrodes) and
 2016-07-15_15.02.29.jpg2016-07-15_15.02.56.jpg2016-07-15_15.03.03.jpg2016-07-15_15.03.09.jpg 
  42   Thu Jul 14 17:06:47 2016 GabrieleElectronicsConfigurationNetworkingThe laboratory workstation is coatings.ligo.caltech.edu

The RTS is cymac3.ligo.caltech.edu

I set up a ssh-mount of the /opt/rtcds/userapps
  
  41   Thu Jul 14 16:56:00 2016 AlenaFacilityDaily Progresstest vacuum systemPlease see prosidures for pumping down
and venting with air for the test vacuum
chamber here
  
  40   Thu Jul 14 15:30:48 2016 ericqElectronicsConfigurationCymac RTS configurationWe played around a bit with the cymac,
in efforts to make things better.


We disabled some more fancy-sounding
  
  39   Tue Jul 12 17:19:07 2016 GabrieleElectronicsDaily ProgressADC and DAC cablingThis afternoon I completed the assembly
of the electronics boards to interface the
ADC and DAC. The ADC is interfaced with a
 2016-07-12_15.57.17.jpg2016-07-12_16.59.17.jpg2016-07-12_16.59.13.jpg 
  38   Mon Jul 11 17:04:06 2016 AlenaFacilityDaily ProgressVacuum chamber testsAt 5pm the pressure was 6.5e-6 torr.

Checked again at:


9am, pressure was 2e-6
  
  37   Mon Jul 11 15:21:12 2016 GabrieleGeneralDaily ProgressOne disk installed into the chamber[Alena, Gabriele]

We attached one of the silicon
lenses to a 1" optical post using some
 2016-07-11_13.04.44.jpg2016-07-11_13.39.40.jpg2016-07-11_13.16.24.jpg2016-07-11_13.23.05.jpg2016-07-11_13.39.44.jpg 
  36   Mon Jul 11 14:56:45 2016 AlenaFacilityDaily ProgressVacuum chamber testsInstalled a gate valve between the roughing
and tubbo pump. See below a pump down curve.
The convection gauge is not calibrated. the
 20160711.png 
  35   Mon Jul 11 08:49:25 2016 GabrieleElectronicsConfigurationCymac RTS configurationI copy here parts of an email from Jamie
with instructions on how to run the RTS on
the cymac:
  
  34   Fri Jul 8 16:49:11 2016 GabrieleElectronicsConfigurationCyMAC In the last days Jamie installed the patched
kernel to run the real time system (RTS)
on the new CyMAC. Today (with Jamie's
 Screen_Shot_2016-07-08_at_4.38.16_PM.png 
  33   Fri Jul 8 15:26:37 2016 AlenaFacilityDaily ProgressVacuum chamber testsFixed the 307 gauge controller (a missing
contact on the rair panel). The low pressure
gauge was connected to 1G port and has measured
 WP_20160708_12_25_35_Pro.jpgWP_20160708_12_25_41_Pro.jpg 
  31   Thu Jul 7 17:44:11 2016 GabrieleFacilityDaily ProgressVacuum chamber tests[Alena, Gabriele]

This afternoon we opened the tall
belljar vacuum chamber, and took everything
 2016-07-07_14.33.34.jpg2016-07-07_14.35.21.jpg2016-07-07_15.55.19.jpg2016-07-07_14.35.26.jpg2016-07-07_15.01.22.jpg 
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