| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
30
|
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. |
|
|
29
|
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 |
|
|
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 |
|
|
27
|
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 |
|
|
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
|
|
|
25
|
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 |
|
|
24
|
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 |
|
|
23
|
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 |
|
|
22
|
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 |
|
|
21
|
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 |
|
|
20
|
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 |
|
|
19
|
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 |
|
|
18
|
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 |
|
|
17
|
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, |
|
|
16
|
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 |
|
|
15
|
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 |
|
|
14
|
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 |
|
|
13
|
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 |
|
|
12
|
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 |
|
|
11
|
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 |
|
|
10
|
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 |
|
|
9
|
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 |
|
|
8
|
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 |
|
|
7
|
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 |
|
|
6
|
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" |
|
|
5
|
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. |
|
|
4
|
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 |
|
|
3
|
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 |
|
|
2
|
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 |
|
|
1
|
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 |
|