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New entries since:Wed Dec 31 16:00:00 1969
ID Date Authorup Type Category Subject Text Attachments
  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 
  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 
  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 
  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 
  689   Mon May 13 18:37:47 2019 aaronCleanGeneralClean room gearMon May 13 18:37:37 2019

Entered CRIME lab to borrow 4x
hair nets and face masks. Can you 
  
  696   Mon May 20 10:35:45 2019 aaronCleanGeneralClean room gearAaron,

There is a buy list of approved
clean room supplies posted here https://dcc.ligo.org/LIGO-E1300399.
  
  702   Fri May 24 15:08:19 2019 alenaGeneralMeasurementsS1600713 S1600714 S1600715 S16007162019-05-24


15:00 in
chamber

S1600713 in CR1
S1600714
in CR2
S1600715in CR3
S1600716
  
  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
  
  173   Thu Nov 10 14:13:34 2016 gabrieleElectronicsConfigurationMATLAB code to control Thorlabs stagesTo be used to automate the laser polishing.  move_complete.mthrolabs_activex.manimation.mdraw_wafer.m 
  1   Wed Jul 11 23:01:01 2012 janoschOpticsCharacterizationstarting the multi-color scatter experimentSteve Maloney, a visiting highschool teacher,
and I have started to set up a new scattering
experiment in the Richter lab. The idea is
 DSCF3148.JPGDSCF3151.JPGDSCF3150.JPG 
  2   Fri Jul 13 10:34:35 2012 janoschOpticsCharacterizationcamera imageWe were confused a bit about how the camera
image changes when you move the arm that
holds the camera and lens around the
  
  3   Fri Jul 13 20:53:35 2012 janoschOpticsCharacterizationtwo imagesThe following two pictures were taken from
the same angle with green (left) and red
(right) incident laser at an angle of 15deg
 Green.pngRed.png 
  4   Tue Jul 17 18:32:11 2012 janoschOpticsCharacterizationpurple imagesWe have the new 405nm laser pointer. 
The image to the left shows the scattered
light from the red laser, the image to the
 Red_30deg.pngPurple_30deg.png 
  5   Wed Jul 18 18:43:34 2012 janoschOpticsCharacterizationgone with the windHere a little purple video. It starts with
scattering angle around 15deg and stops at
about 80deg. 
 Purple.avi 
  6   Fri Jul 20 18:35:42 2012 janoschOpticsCharacterizationpurple improvements and first uncalibrated BSDF curvesToday we improved alignment of the lens-camera
arm. We discovered earlier that this alignment
affects the amount of "snowfall"
 Purple.mp4Red.mp4Purple_BSDF.pngRed_BSDF.png 
  7   Tue Jul 24 10:59:59 2012 janoschOpticsCharacterizationsum of purple and redWe played around with Matlab today. The
first step was to convert light wavelengths
into RGB colors. In this way we can combine
 ImageSum.png 
  8   Fri Oct 12 16:23:20 2012 janoschOpticsDaily Progressreassembled setupNothing has happened since Steve, the visiting
highschool teacher, has left. Meanwhile,
some parts of the multi-color BRDF setup
  
  12   Sun May 8 13:35:04 2016 ranaElectronicsDesignDesign of optical lever electronics Koji, Rich, and I recently came up with
a new QPD design which is better for general
lab use than the aLIGO ones (which have a
  
  131   Wed Sep 28 10:26:58 2016 ranaGeneralGeneralreferences on ideal glassesSome easy to read reviews on
thin films and ideal glass for people getting
started in this Q measuring game.



  
  244   Sat Dec 17 06:29:15 2016 ranaElectronicsConfigurationTiming issue: is it a DAC issue?I find sometimes that the probe configuration
can give these distorted signals. For the
Tektronix probes, its best to use a 500 MHz
  
  137   Wed Oct 19 16:40:24 2016 sults:GeneralMeasurementsS1600349S1600439, not annealed, as received
from Mark Optics

Installation


installed
and balanced, pump down started at 4:38pm
 10x 
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