| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
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1
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Wed Jul 11 23:01:01 2012 |
janosch | Optics | Characterization | starting the multi-color scatter experiment | Steve Maloney, a visiting highschool teacher,
and I have started to set up a new scattering
experiment in the Richter lab. The idea is |
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2
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Fri Jul 13 10:34:35 2012 |
janosch | Optics | Characterization | camera image | We were confused a bit about how the camera
image changes when you move the arm that
holds the camera and lens around the |
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3
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Fri Jul 13 20:53:35 2012 |
janosch | Optics | Characterization | two images | The following two pictures were taken from
the same angle with green (left) and red
(right) incident laser at an angle of 15deg |
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4
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Tue Jul 17 18:32:11 2012 |
janosch | Optics | Characterization | purple images | We have the new 405nm laser pointer.
The image to the left shows the scattered
light from the red laser, the image to the |
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5
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Wed Jul 18 18:43:34 2012 |
janosch | Optics | Characterization | gone with the wind | Here a little purple video. It starts with
scattering angle around 15deg and stops at
about 80deg. |
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6
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Fri Jul 20 18:35:42 2012 |
janosch | Optics | Characterization | purple improvements and first uncalibrated BSDF curves | Today we improved alignment of the lens-camera
arm. We discovered earlier that this alignment
affects the amount of "snowfall" |
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7
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Tue Jul 24 10:59:59 2012 |
janosch | Optics | Characterization | sum of purple and red | We played around with Matlab today. The
first step was to convert light wavelengths
into RGB colors. In this way we can combine |
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8
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Fri Oct 12 16:23:20 2012 |
janosch | Optics | Daily Progress | reassembled setup | Nothing has happened since Steve, the visiting
highschool teacher, has left. Meanwhile,
some parts of the multi-color BRDF setup |
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9
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Mon May 2 11:46:45 2016 |
Gabriele | Facility | Daily Progress | Table and vacuum chambers in the lab | Elogs for the new Coatin
RIng-down
MEasurement |
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10
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Tue May 3 11:57:47 2016 |
Gabriele | Facility | Daily Progress | Table and vacuum chambers in the lab | We discovered a couple of days ago that
the table was sitting on three legs only
and the fourth one was dangling. I managed |
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11
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Fri May 6 14:20:43 2016 |
Gabriele | Electronics | Design | Design of optical lever electronics | For the optical levers we are going to
use the same QPD that are used in aLIGO optical
levers (see T1600085 and |
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12
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Sun May 8 13:35:04 2016 |
rana | Electronics | Design | Design 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 |
|
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13
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Tue May 10 13:32:17 2016 |
Gabriele | Electronics | Design | Design of optical lever electronics | After a very useful discussion with Rich
this morning, I think the circuit based on
aLIGO optical levers design should be good |
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14
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Thu May 19 11:33:44 2016 |
Gabriele | Electronics | Design | Optical lever electronics design | The circuit design sent out for fabrication
is available in the DCC: D1600196 |
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15
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Thu May 19 11:36:04 2016 |
Gabriele | Mechanics | Design | A first design of the disk assembly | Here are some screenshots of the disk assembly
and a look at how four of them will sit into
the vacuum chamber. The Solidworks models |
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16
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Fri May 20 15:18:58 2016 |
Gabriele | Optics | Design | Optical levers layout | Attached a first layout of the optical
lever systems. The beam spot radius on the
QPD is about 0.8 mm, and the lever arm length |
|
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17
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Sun May 22 23:40:45 2016 |
Gabriele | Optics | Design | Optical levers layout | An improved design is attached. I modified
the input telescope to avoid using shor focal
length lenses, to make it less critical, |
|
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18
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Thu May 26 02:51:27 2016 |
Gabriele | Electronics | Design | ESD design | A preliminary design of the ESD board is
available on the DCC: D1600214 |
|
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19
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Fri May 27 02:09:37 2016 |
Gabriele | Mechanics | Characterization | Lowest usable mode of fused silica disks | I did some FEA simulation of fused silica
disks, to identify the lowest usable eigenmode.
By usable I mean a mode that has zero elastic |
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20
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Mon Jun 6 13:35:36 2016 |
Gabriele | Electronics | General | Components | The PCBs for the QPD circuit and ADC interface
are here and look ok. All electronics components
are also here (except for the ADC connector |
|
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21
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Tue Jun 7 14:07:55 2016 |
Gabriele | Facility | General | Rack and workstation | I 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 |
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22
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Fri Jun 10 13:44:06 2016 |
Gabriele | Electronics | Configuration | How to setup a workstation | Instructions on how to setup a workstation
are available here:
https://nodus.ligo.caltech.edu:8081/Cryo_Lab/1135 |
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23
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Thu Jun 16 00:47:42 2016 |
Gabriele | Optics | Daily Progress | Quality factor measurement of a Mark Optics disk at LMA | [Massimo Granata (LMA), Quentin Cassar
(LMA), Gabriele]
This week I'm visiting LMA |
|
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24
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Fri Jun 24 17:03:47 2016 |
Gabriele | Electronics | Daily Progress | QPD electronics | Between yesterday and today I populated
one QPD board (based on D1600196),
and started testing it. The transimpedance |
|
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25
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Tue Jun 28 10:17:28 2016 |
Gabriele | Electronics | Daily Progress | QPD electronics | Transimpendance and whitening are working
properly. I can't get useful signal out
of the differential stages yet. I replaced |
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26
|
Wed Jun 29 16:44:17 2016 |
Gabriele | General | Configuration | First disk eigenfrequency | The following table shows the lowest eigenfrequency
(Hz) for different sizes of disks
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27
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Thu Jun 30 16:18:28 2016 |
Gabriele | Electronics | Daily Progress | QPD electronics is working | Today I gave up trying to fix the first
board I populated, and built a second one.
The good news is that it's working as |
|
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28
|
Thu Jun 30 17:23:54 2016 |
Gabriele | Electronics | Daily Progress | Cymac | I got two new ADC and DAC boards from Rolf,
with the correct PCIe interface. I installed
them into the cymac and checked that the |
|
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29
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Fri Jul 1 15:12:12 2016 |
Gabriele | Electronics | Daily Progress | QPD electronics noise |
I turned out that all the noise
I was seeing in the QPD spectrum was due |
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30
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Thu Jul 7 16:40:22 2016 |
Gabriele | Electronics | Daily Progress | QPD boxes | To mitigate the issue of ambient light
pulluting the QPD signal, I mounted the prototype
into a custum built box. This helps a lot. |
|
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31
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Thu Jul 7 17:44:11 2016 |
Gabriele | Facility | Daily Progress | Vacuum chamber tests | [Alena, Gabriele]
This afternoon we opened the tall
belljar vacuum chamber, and took everything |
|
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33
|
Fri Jul 8 15:26:37 2016 |
Alena | Facility | Daily Progress | Vacuum chamber tests | Fixed the 307 gauge controller (a missing
contact on the rair panel). The low pressure
gauge was connected to 1G port and has measured |
|
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34
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Fri Jul 8 16:49:11 2016 |
Gabriele | Electronics | Configuration | CyMAC | In the last days Jamie installed the patched
kernel to run the real time system (RTS)
on the new CyMAC. Today (with Jamie's |
|
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35
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Mon Jul 11 08:49:25 2016 |
Gabriele | Electronics | Configuration | Cymac RTS configuration | I copy here parts of an email from Jamie
with instructions on how to run the RTS on
the cymac: |
|
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36
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Mon Jul 11 14:56:45 2016 |
Alena | Facility | Daily Progress | Vacuum chamber tests | Installed a gate valve between the roughing
and tubbo pump. See below a pump down curve.
The convection gauge is not calibrated. the |
|
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37
|
Mon Jul 11 15:21:12 2016 |
Gabriele | General | Daily Progress | One disk installed into the chamber | [Alena, Gabriele]
We attached one of the silicon
lenses to a 1" optical post using some |
|
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38
|
Mon Jul 11 17:04:06 2016 |
Alena | Facility | Daily Progress | Vacuum chamber tests | At 5pm the pressure was 6.5e-6 torr.
Checked again at:
9am, pressure was 2e-6 |
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39
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Tue Jul 12 17:19:07 2016 |
Gabriele | Electronics | Daily Progress | ADC and DAC cabling | This afternoon I completed the assembly
of the electronics boards to interface the
ADC and DAC. The ADC is interfaced with a |
|
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40
|
Thu Jul 14 15:30:48 2016 |
ericq | Electronics | Configuration | Cymac RTS configuration | We played around a bit with the cymac,
in efforts to make things better.
We disabled some more fancy-sounding |
|
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41
|
Thu Jul 14 16:56:00 2016 |
Alena | Facility | Daily Progress | test vacuum system | Please see prosidures for pumping down
and venting with air for the test vacuum
chamber here |
|
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42
|
Thu Jul 14 17:06:47 2016 |
Gabriele | Electronics | Configuration | Networking | The 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 |
|
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43
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Fri Jul 15 16:05:07 2016 |
Gabriele | Electronics | Daily Progress | Electrostatic actuator installed | Using the already installed high voltage
feedthrough, I cabled one of the electrostatic
actuators (1mm gap between electrodes) and |
|
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44
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Fri Jul 15 17:56:50 2016 |
Gabriele | General | Daily Progress | QPD connected to digital system | I connected the QPD to the ADC interface
with a temporary cable running on the floor.
I could get signals. I still have |
|
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45
|
Sat Jul 16 14:15:44 2016 |
Gabriele | Facility | Daily Progress | Pump down started | Following Alena's
procedure, at about 1:30pm LT I started
the chamber pump down. At 14:15pm LT the |
|
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46
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Mon Jul 18 13:39:45 2016 |
Gabriele | Facility | Daily Progress | Pump down started | Today at 1:40pm pressure is 8.5e-7 Torr
|
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47
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Mon Jul 18 13:42:46 2016 |
Gabriele | Electronics | Characterization | QPD signal convention | The QPD quadrants are wired accoridng to
the following convention
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48
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Mon Jul 18 14:29:07 2016 |
Gabriele | General | Daily Progress | Status of the test setup | I checked that the QPD electronics works
as expected, and that I can acquire the signals
using the ADCs. A new model (x3cr1) is up |
|
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49
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Mon Jul 18 17:46:04 2016 |
Gabriele | General | Daily Progress | First look at QPD signals | Here's the first spectrum of the QPD
X and Y signals, acquired with the digital
system. Roughing and turbo pumps are still |
|
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50
|
Mon Jul 18 17:48:58 2016 |
Gabriele | Electronics | Configuration | Status of real time system and workstation | [EricQ, Gabriele]
The real time system seems to be
working properly, except for the excitations: |
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51
|
Mon Jul 18 18:05:46 2016 |
Gabriele | Optics | Daily Progress | Optical setup | Small modifications to the optical setup:
added a 1m focal lenght
lens (AR coated for 1064nm...) right before |
|