| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
551
|
Wed Jul 25 11:23:44 2018 |
Alena | General | General | CR14 re-alignement | Aligned CR14 chamber back to 3" disks. |
|
|
60
|
Mon Jul 25 15:35:31 2016 |
Gabriele | Optics | Characterization | Calibration of the QPD in physical units | The
equations below are wrong. Please refer to https://nodus.ligo.caltech.edu:8081/CRIME_Lab/116 |
|
|
113
|
Thu Sep 15 11:23:13 2016 |
Gabriele | Facility | General | Chamber open | Turbo pump off and spinning down at 9:37am
LT. Pumo completely stopped at 11:15am LT
Openend the chamber and removed |
|
|
217
|
Tue Nov 29 17:06:13 2016 |
Gabriele | Electronics | Configuration | Changed whitening filters of four more boards | I modified four more QPD boards to implement
the new whitening filters detailed in elog 207. |
|
|
365
|
Thu Jul 6 12:08:35 2017 |
Zach | Electronics | Modeling | Checking physical parameters | 2017-07-06
I compared
the electric field and the polarization to
make sure that those calculations made sense. |
|
|
68
|
Thu Jul 28 14:01:27 2016 |
Alena | General | Daily Progress | Clean room | Ordered the clean room (hardware+hepa filters)
and vacuum gauges |
|
|
90
|
Fri Aug 19 13:46:55 2016 |
Alena, Calum, Jon, Liz, Steve, Gabriele | Facility | Daily Progress | Clean room and vacuum complete | This morning we installed the clean room
curtains and washed them. It turns out that
the air filters are supposed to be powered |
|
|
88
|
Wed Aug 17 16:41:05 2016 |
Gabriele, Alena | Clean | Daily Progress | Clean room construction progress | The clean room frame is built and secured
to the floor and wall. Panels are being installed
on the ceiling and back. Also, the optical |
|
|
89
|
Thu Aug 18 18:15:18 2016 |
Gabriele, Alena | Clean | Daily Progress | Clean room construction progress | Ceiling, back and side panels are installed.
The air filters have been cabled and connected
to the power supply. |
|
|
689
|
Mon May 13 18:37:47 2019 |
aaron | Clean | General | Clean room gear | Mon 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 |
aaron | Clean | General | Clean room gear | Aaron,
There is a buy list of approved
clean room supplies posted here https://dcc.ligo.org/LIGO-E1300399. |
|
|
86
|
Tue Aug 16 11:53:30 2016 |
Alena, Gabriele | Clean | Daily Progress | Clean room progress | Some progress on the cleam room: bar fixed
to the wall, some more structure built, filters
in place. We had to (literally) work around |
|
|
221
|
Fri Dec 2 10:56:40 2016 |
Gabriele | General | Measurements | Cleaning improves the Q values a bit | The plot below compares the measured Q
values of S1600433 right after annealing,
and after GariLynn cleaned it. Q values are |
|
|
140
|
Thu Oct 20 14:38:24 2016 |
Gabriele | Clean | Daily Progress | Cleaning of S1600433 and S1600438 | Samples #433 (annealed and cleaned) and
#438 (as received from Mark Optics) are now
with GariLynn for deep cleaning. |
|
|
147
|
Tue Oct 25 09:12:31 2016 |
Gabriele | General | Measurements | Comparison of first and second batch | The plot below compares a sample from the
first batch and two samples from the second
batch. All samples are as received from Mark |
6x |
|
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 |
|
|
382
|
Thu Jul 27 13:37:31 2017 |
Zach | Electronics | Modeling | Corrected sample gap sweep | 2017-07-27
I resolved
a couple more data processing bugs and calculated
a sweep of the ESD-Sample gap from a distance |
|
|
34
|
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 |
|
|
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 |
|
|
35
|
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: |
|
|
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 |
|
|
102
|
Tue Aug 23 08:46:04 2016 |
Gabriele | General | Daily Progress | Daily tests | MO03 - edge polished:
Turbo off, QPD centered, before
excitation (60 seconds) |
|
|
74
|
Mon Aug 8 10:42:46 2016 |
Gabriele | General | General | Dependency of eigenmode frequencies on thickness and diameter | I ran a set of COMSOL simulations to determine
the dependency of the frequency of each eigenmode
on the disk thickness and diameter, within |
26x |
|
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 |
|
|
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 |
|
|
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 |
|
|
108
|
Tue Sep 13 10:33:35 2016 |
Gabriele | General | General | Disk excited | Disk excited with white uniform noise,
amplitude 5 V, for some tens of seconds.
Excitation off at |
|
|
91
|
Fri Aug 19 19:05:01 2016 |
Gabriele | Optics | Daily Progress | Disk installed into the chamber | I assembled the disk suspension sytem and
installed into the chamber. Although I don't
have the magnets and coils, I installed the |
10x |
|
319
|
Fri Feb 24 14:44:22 2017 |
Gabriele | General | General | Disk model | It's possible to build an analytical
model of the resonant frequencies of a simple
thin disk. For example, see J. Sound |
|
|
361
|
Fri Jun 30 16:27:56 2017 |
Zach | Electronics | Modeling | Double Checking Model | 2017-06-30
In order
to confirm the accuracy of my model I checked
some easily computable quantities between |
|
|
407
|
Tue Aug 15 00:09:01 2017 |
Zach | Electronics | Modeling | ESD Improvements | 2017-08-14
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 |
Zach | Electronics | Modeling | ESD along edge | 2017-08-16
I placed
created a very narrow ESD placed along the
edge of the sample. The thought behind this |
|
|
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 |
|
|
405
|
Thu Aug 10 13:36:08 2017 |
Gabriele, Zach | Mechanics | Configuration | ESD moved closer to disk in CR0 | We first measured the distance of the ESD
from the disk in the test chamber (CR0).
We had to remove the retaining ring to have |
|
|
406
|
Fri Aug 11 09:22:21 2017 |
Gabriele | Mechanics | Configuration | ESD moved closer to disk in CR0 | The plots below compare the SNR and peak
amplitude of all excited modes, in the new
and old configuration. The new confgiuration |
|
|
420
|
Fri Aug 18 15:10:23 2017 |
Zach, Gabriele | Electronics | Modeling | ESD prototype | 2017-08-18
We created
a prototype of PCB for the ESD design. Unfortunately
the orientation of the two combs was flipped, |
|
|
417
|
Fri Aug 18 10:50:53 2017 |
Zach | Electronics | Modeling | ESD's with positive voltage | 2017-08-18
With both
electrodes driven at a positive voltage,
the results are still an improvement over |
|
|
114
|
Thu Sep 15 15:15:10 2016 |
Gabriele | General | General | Edge effect on losses | I made a COMSOL model that can compute
the distribution of elastic energy for each
mode, dividing it into: |
|
|
145
|
Mon Oct 24 14:33:46 2016 |
Gabriele | General | Measurements | Effect of annealing: Q increases | S1600439 has been measured as received
(before annealing, elog
137) and after annealing (elog |
|
|
396
|
Tue Aug 8 10:18:30 2017 |
Gabriele | General | Measurements | Effect of assist beam on tantala coatings - after post deposition annealing | Introduction
The same set of
samples described in the previous
entry have been annealed at 500C for |
10x |
|
395
|
Tue Aug 8 09:58:34 2017 |
Gabriele | General | Measurements | Effect of assist beam on tantala coatings - no post deposition annealing | ntroduction
A set of substrates
have been coated by the Colorado State University
Fort Collins group, with ~500 nm tantala |
|
|
243
|
Thu Dec 15 11:58:55 2016 |
Gabriele | General | General | Effect of clip fingerprints on dilution factor | The disks coated at Montreal are hold with
three small clips. Therefore there are three
small regions close to the edge that are |
|
|
344
|
Tue May 16 13:44:01 2017 |
Gabriele | General | General | Effect of meshing on dilution factor simulation | I ran a series of COMSOL simulations to
compute the dilution factors of a coated
disk with the dimensions we are currently |
|
|
43
|
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 |
|
|
123
|
Thu Sep 22 15:00:49 2016 |
Gabriele | Electronics | Configuration | Epics values now saved to frames | I was looking at some past trend data and
discovered that EPICS values were not written
to the frames. I added the following two |
|
|
125
|
Fri Sep 23 08:33:39 2016 |
Gabriele | Electronics | Configuration | Epics values now saved to frames | Now EPICS values are saved to frames, but
they are all zero! I noticed that we always
had the same problems with the cymac2 too. |
|
|
129
|
Tue Sep 27 14:54:53 2016 |
Gabriele | Electronics | Configuration | Epics values now saved to frames | Apparently, there was a mismatch in the
configuration, and DAQD was adding a wonderful
16 Hz comb all over the spectrum. |
|
|
128
|
Tue Sep 27 08:53:46 2016 |
Gabriele | General | Vacuum | Etched disk installed | Installed the etched disk: using manually
the centering ring allowed me to get the
beam on the QPD. A couple of taps to the |
|
|
118
|
Tue Sep 20 16:43:58 2016 |
Gabriele | General | General | Excitation and ring down | The pressure is at abour 3e-6 Torr. I centered
the QPD and started an excitation. The HV
amplifier manual states that the driver can |
|
|
119
|
Wed Sep 21 08:12:13 2016 |
Gabriele | General | General | Excitation and ring down | New excitation (2000V) at about 8:06am.
Had to recenter the QPD again after the excitation.
Engaged the 500Hz high pass filter |
|