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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Typeup Category Subject Text Attachments
  388   Wed Aug 2 13:47:47 2017 ZachElectronicsModelingArm width Sweep2017-08-02


I ran a
sweep of the width of the ESD arms. There
appears to be a linear relationship across
 Arm_width_fine.jpgmode_25.jpg 
  389   Wed Aug 2 15:40:00 2017 ZachElectronicsModelingParameter diagramI am posting a diagram of the geometric
parameters that I swept. The only one not
included is the vertical space between the
 ESD_w_param.png 
  394   Mon Aug 7 13:19:48 2017 ZachElectronicsModelingNormalized data2017-08-07


I included
the modal mass factors in the code and renormalized
my data. The normalization has a noticeable
 Arm_gap.pdfArm_width.pdfOffset.pdfSample_Gap.pdf 
  398   Tue Aug 8 16:20:24 2017 ZachElectronicsModelingRotated ESD 2017-08-08


I rotated
the ESD and calculated it's modal projections
by rotating the data array that MATLAB extracts
 ESD.pdfRotated.pdfresonantmodes.pdf 
  399   Wed Aug 9 12:10:47 2017 ZachElectronicsModelingPreliminary improvement from ESD optimization2017-08-09


I created
a plot of the ratio of the force in the optimized
design to the force in the original design.
 Ratio.jpgRatio.jpgo_gap.jpgOriginal.jpgOptimized.jpg 
  400   Wed Aug 9 15:57:28 2017 ZachElectronicsModelingTriangular Geometry2017-08-09


I compared
the triangular geometry to the original geometry
and the excitation was only improved
 tratio.jpg 
  401   Wed Aug 9 17:07:57 2017 ZacharyElectronicsModelingOptimization Summary2017-08-09



p.p1 {margin: 0.0px 0.0px
0.0px 0.0px; font: 11.0px 'Helvetica Neue';
 6x 
  402   Thu Aug 10 10:47:54 2017 ZachElectronicsModelingGeometry Ratios2017-08-10


The attached
plots compare the new and old geometries
with .5 mm and 1 mm sample gaps. They are
 Optimization_plot_lin.pdfOptimization_plot_log.pdf 
  407   Tue Aug 15 00:09:01 2017 ZachElectronicsModelingESD Improvements2017-08-14


I did my
best to increase the excitation in the higher
order modes. By making the ESD narrower (a
 10x 
  409   Tue Aug 15 16:43:58 2017 ZachElectronicsModelingUnchanged Mode Insight2017-08-15


It appears
to me that the major factor limiting the
improvement of the modes that either remain
 Double.pdfThin.pdfOriginal.pdf 
  411   Wed Aug 16 10:04:24 2017 ZachElectronicsModelingESD along edge2017-08-16


I placed
created a very narrow ESD placed along the
edge of the sample. The thought behind this
 edge.jpgoverlay15.jpgoverlay15.jpg 
  412   Wed Aug 16 11:36:13 2017 ZachElectronicsModelingMiddle ESD 2017-08-16


I created
a model with a drive offset in the middle.
It improved one of the modes by a factor
 middle.jpgoverlay23.jpgoverlay23.jpg 
  414   Wed Aug 16 16:05:09 2017 ZachElectronicsModelingTwo ESD First test2017-08-16


I created
a model with two ESD's, essentially a
combination of my previous two attempts with
 Double_Modes.jpgTwo.jpgTwoESD_geo.png 
  415   Thu Aug 17 14:19:04 2017 ZachElectronicsModelingTwo ESD Optimization2017-08-17


I ran a
sweep of the position of the middle ESD to
determine the optimal arrangement. From the
 17x 
  416   Thu Aug 17 23:34:51 2017 ZachElectronicsModelingOptimized ESD Drawing2017-08-17


I made a
drawing of the Optimal ESD design. The bottom
combs (right hand in the rotated image) are
 OptimizedESD.pdf 
  417   Fri Aug 18 10:50:53 2017 ZachElectronicsModelingESD's with positive voltage2017-08-18


With both
electrodes driven at a positive voltage,
the results are still an improvement over
 two_positive.jpg 
  419   Fri Aug 18 14:15:47 2017 ZachElectronicsModelingSame Voltage ESD Sweep2017-08-18


I ran a
sweep of the central position in the two
ESD setup with both set at the same voltage.
 two_positive_ratio_sweep.pdf-2mm_two_positive.jpg3mm_two_positive.jpg-2mm_two_positive.jpg 
  420   Fri Aug 18 15:10:23 2017 Zach, GabrieleElectronicsModelingESD prototype2017-08-18


We created
a prototype of PCB for the ESD design. Unfortunately
the orientation of the two combs was flipped,
 Crime_ESD_Zach_prototype.pdf 
  421   Wed Aug 23 14:11:13 2017 Zach, GabrieleElectronicsMeasurementsInstalling ESD Prototype2017-08-23


Installed
ESD Prototype design by taping it to the
older design, we then lowered the mount until
 image1.JPGimage2.JPG 
  456   Tue Jan 30 15:56:36 2018 Gabriele, CraigElectronicsConfigurationTemporary data acqusition for PSL lab beat note and accelerometersWe set up the model x3tst to acquire at
65kHz four signals coming from the PSL lab:


X3:TST-BEAT_OUT_DQ: beat
  
  9   Mon May 2 11:46:45 2016 GabrieleFacilityDaily ProgressTable and vacuum chambers in the labElogs for the new Coatin
RIng-down
MEasurement
 2016-04-19_10.35.50.jpg2016-04-21_09.38.33.jpg 
  10   Tue May 3 11:57:47 2016 GabrieleFacilityDaily ProgressTable and vacuum chambers in the labWe discovered a couple of days ago that
the table was sitting on three legs only
and the fourth one was dangling. I managed
  
  21   Tue Jun 7 14:07:55 2016 GabrieleFacilityGeneralRack and workstationI moved the unused rack from the Crackling
Noise lab to the C.Ri.Me lab. It will be
used for the new cymac. I also started putting
 2016-06-07_10.53.30.jpg2016-06-07_10.53.26.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 
  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 
  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 
  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
  
  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
  
  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
  
  46   Mon Jul 18 13:39:45 2016 GabrieleFacilityDaily ProgressPump down startedToday at 1:40pm pressure is 8.5e-7 Torr




  
  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
  
  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 
  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 
  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 
  113   Thu Sep 15 11:23:13 2016 GabrieleFacilityGeneralChamber openTurbo pump off and spinning down at 9:37am
LT. Pumo completely stopped at 11:15am LT

Openend the chamber and removed
  
  126   Mon Sep 26 15:54:01 2016 GabrieleFacilityConfigurationMoved vacuum controllersI moved the turbo pump controller out of
the clean room. Also, I installed the gauge
controller on the Cymac rack.
 2016-09-26_15.44.13.jpg 
  216   Tue Nov 29 17:02:06 2016 GabrieleFacilityNoise huntingSuspending the roughing pumpI suspended the roughing pump with four
springs. The reduction of the 58 Hz peak
is similar to what I got when the pump was
 2016-11-29_11.08.17.jpg2016-11-29_11.12.35.jpg2016-11-29_11.08.21.jpg 
  265   Thu Jan 19 12:49:17 2017 GabrieleFacilityVacuumSkyhook installedThe SkyHook has been put in place and bolted
down to the floor.

 IMG_4241.JPGIMG_4241.JPGIMG_4241.JPGIMG_4241.JPG 
  430   Thu Sep 14 15:59:10 2017 GabrieleFacility All wrapped up for Saturday plumbing work   2017-09-14_14.03.21.jpg2017-09-14_14.03.53.jpg2017-09-14_14.04.15.jpg 
  26   Wed Jun 29 16:44:17 2016 GabrieleGeneralConfigurationFirst disk eigenfrequencyThe following table shows the lowest eigenfrequency
(Hz) for different sizes of disks

 disk_75mm_1mm.pngeigenfrequencies.png 
  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 
  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
  
  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 
  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 
  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 
  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 
  68   Thu Jul 28 14:01:27 2016 AlenaGeneralDaily ProgressClean roomOrdered the clean room (hardware+hepa filters)
and vacuum gauges
  
  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 
  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 
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