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New entries since:Wed Dec 31 16:00:00 1969
IDup Date Author Type Category Subject Text Attachments
  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
  
  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 
  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 
  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
  
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  68   Thu Jul 28 14:01:27 2016 AlenaGeneralDaily ProgressClean roomOrdered the clean room (hardware+hepa filters)
and vacuum gauges
  
  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 
  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 
  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.
  
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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
  
  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
  
  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 
  82   Sat Aug 13 14:05:02 2016 GabrieleGeneralDaily ProgressFirst work on the measurement user interfaceToday I started programming part of the
user interface that will be used to perform
the measurements. Not much implemented so
 Screenshot-C.Ri.Me..pngcrime.png 
  83   Sun Aug 14 11:40:29 2016 GabrieleElectronicsDaily ProgressSome python code Today I wrote some auxiliary functions
that will be useful for the measurement system:


noise.py: set of functions
 noise.pngnoise_multi_band.pngpeak.png 
  84   Sun Aug 14 18:13:52 2016 GabrieleElectronicsDaily ProgressProgress on the user interfaceSome progress on writing the user interface:

 crime1.pngcrime2.png 
  85   Sun Aug 14 18:26:19 2016 GabrieleGeneralGeneralPlans for the automatic mode searchHere's how I imagine the mode search
to proceed:


the user select the list
  
  86   Tue Aug 16 11:53:30 2016 Alena, GabrieleCleanDaily ProgressClean room progressSome progress on the cleam room: bar fixed
to the wall, some more structure built, filters
in place. We had to (literally) work around
 2016-08-16_10.25.05.jpg 
  87   Tue Aug 16 11:57:03 2016 GabrieleElectronicsConfigurationFixed cymac3 network and time issueThe cymac3 internal clock was off by about
10 seconds. When I tried to start the NTP
service, I found out that the cymac3 couldn't
  
  88   Wed Aug 17 16:41:05 2016 Gabriele, AlenaCleanDaily ProgressClean room construction progressThe clean room frame is built and secured
to the floor and wall. Panels are being installed
on the ceiling and back. Also, the optical
 2016-08-17_15.29.40.jpg2016-08-17_15.30.05.jpg 
  89   Thu Aug 18 18:15:18 2016 Gabriele, AlenaCleanDaily ProgressClean room construction progressCeiling, back and side panels are installed.
The air filters have been cabled and connected
to the power supply.
 2016-08-18_18.07.29.jpg2016-08-18_18.07.42.jpg 
  90   Fri Aug 19 13:46:55 2016 Alena, Calum, Jon, Liz, Steve, GabrieleFacilityDaily ProgressClean room and vacuum completeThis morning we installed the clean room
curtains and washed them. It turns out that
the air filters are supposed to be powered
 2016-08-19_10.54.51.jpg2016-08-19_12.07.29.jpg2016-08-19_12.38.42.jpg 
  91   Fri Aug 19 19:05:01 2016 GabrieleOpticsDaily ProgressDisk installed into the chamberI assembled the disk suspension sytem and
installed into the chamber. Although I don't
have the magnets and coils, I installed the
 10x 
  92   Sat Aug 20 17:01:10 2016 GabrieleGeneralDaily ProgressFirst ring down measurementsEverything is working pretty well. This
morning the pressure was about 1.2e-6 Torr.
I connected the high voltage amplifier and
 modes.pdf 
  93   Sat Aug 20 22:18:26 2016 GabrieleGeneralDaily ProgressFirst measured QsUsing the first ring down of the day (GPS 1155754513
+ 3600 seconds), I computed the amplitude
of each of the modes already identified,
 22x 
  94   Sun Aug 21 08:51:22 2016 GabrieleGeneralDaily ProgressNew disk installedVented the chamber. Installed a new disk
(MO 03). The one I measured yesterday is
now named MO 02 and it is the one with the
  
  95   Sun Aug 21 13:45:56 2016 GabrieleOpticsDaily ProgressWierd behavior of ring downs and Improved setupThe last two ring downs I measured today
showed a weird behavior of the lowest modes:

 second_ring_downs.pngthird_ring_downs.png2016-08-21_08.46.11.jpg2016-08-21_13.29.24.jpg2016-08-21_13.29.32.jpg 
  96   Sun Aug 21 15:36:16 2016 GabrieleGeneralDaily ProgressNew testRoughing pump stopped at about 3:30:30pm.
HV amplifier on at 3:33:30pm, excitation
at 3:35:30pm. Recentered QPD at 3:36pm
  
  97   Sun Aug 21 17:16:03 2016 GabrieleGeneralDaily ProgressRing down measurement with new diskAfter fixing the setup, the measurement
with the new disk looks great. After more
than one hour the first two modes are still
 22x 
  98   Sun Aug 21 17:41:34 2016 GabrieleGeneralDaily ProgressNew testI checked the status at about 5:20pm, the
turbo pump was in error and spinning down,
since the roughing pump has been off for
  
  99   Mon Aug 22 08:29:24 2016 GabrieleGeneralDaily ProgressNew testRestarted roughing and turbo pump at about
8:10am.

  
  100   Mon Aug 22 12:01:52 2016 GabrieleGeneralGeneralTests of the dayDisk excited at 12:01pm. Exited the room
at 12:03pm.

Opened the chamber at about 2:30pm,
  
  101   Mon Aug 22 16:59:13 2016 Gabriele, AlastairOpticsDaily ProgressLaser polishing of the disk edgesWe set up a test facility for laser polishing
the disk edges, using the CO2 laser in the
TCS laboratory. We focused the beam with
 2016-08-22_14.47.47.jpg2016-08-22_13.52.02.jpg 
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