| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
289
|
Wed Feb 1 16:58:10 2017 |
Gabriele | General | Characterization | Excitation tests | The excitation is working fine. However,
there is a large cross coupling in the excitation
between channels: so if I switch on only |
|
|
422
|
Thu Aug 24 07:40:33 2017 |
Gabriele | General | Measurements | Excitations with new ESD | 2017-08-23
Excitations
Quiet
time before excitation: 1187577794
Excitation broadband: 1187577826 |
|
|
424
|
Fri Aug 25 07:25:32 2017 |
Gabriele | General | Measurements | Excitations with new ESD | The results show very low Q values, so
we suspected some issues. Yesterday we openend
the chamber and moved the ESD up, as high |
|
|
425
|
Fri Aug 25 19:29:07 2017 |
Gabriele | General | Measurements | Excitations with new ESD | New set of excitations after raising the
ESD:
Quiet time before excitation: |
|
|
105
|
Thu Sep 1 02:13:33 2016 |
Gabriele | Optics | Characterization | Expected frequencies for the 75 mm disks with flats | Here are the nominal parameters of the
disk with flats
|
|
|
213
|
Mon Nov 28 16:02:16 2016 |
Gabriele | General | General | Expected frequencies for the MIT samples |
|
|
|
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
|
|
|
107
|
Mon Sep 12 16:00:06 2016 |
Gabriele | General | Daily Progress | First fully automated measurements of ring down | I finished the first version of the automation
software to measure the ring down of the
disk modes. I tested it with the new substrate |
|
|
49
|
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 |
|
|
93
|
Sat Aug 20 22:18:26 2016 |
Gabriele | General | Daily Progress | First measured Qs | Using the first ring down of the day (GPS 1155754513
+ 3600 seconds), I computed the amplitude
of each of the modes already identified, |
22x |
|
53
|
Tue Jul 19 17:21:48 2016 |
Gabriele | General | Daily Progress | First 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 |
|
|
285
|
Tue Jan 31 16:50:55 2017 |
Gabriele, Alena | General | Vacuum | First pump-down with setup | This afternoon we started the pump-down
with all the system installed into the chamber.
Unfortunately the IGM vacuum gauge isn't |
|
|
92
|
Sat Aug 20 17:01:10 2016 |
Gabriele | General | Daily Progress | First ring down measurements | Everything is working pretty well. This
morning the pressure was about 1.2e-6 Torr.
I connected the high voltage amplifier and |
|
|
292
|
Mon Feb 6 14:09:07 2017 |
Gabriele | General | Measurements | First set of parallel measurements completed | The new laser is still acting up a bit,
with a wandering line moving sometimes inside
the band. Nevertheless, I could perform the |
|
|
267
|
Thu Jan 19 14:27:02 2017 |
Alena | General | Vacuum | First vacuum test new chamber | Turbo pump controller (new chamber) was
configured. Need to reduce the frequency
or setup a standby mode. First pump down: |
|
|
82
|
Sat Aug 13 14:05:02 2016 |
Gabriele | General | Daily Progress | First work on the measurement user interface | Today I started programming part of the
user interface that will be used to perform
the measurements. Not much implemented so |
|
|
87
|
Tue Aug 16 11:57:03 2016 |
Gabriele | Electronics | Configuration | Fixed cymac3 network and time issue | The cymac3 internal clock was off by about
10 seconds. When I tried to start the NTP
service, I found out that the cymac3 couldn't |
|
|
364
|
Wed Jul 5 16:40:51 2017 |
Zach | Electronics | Modeling | Force disparity-improvement | 2017-07-05
In order
to improve my data I shrunk the region of
the finer meshing slightly and made the mesh |
|
|
363
|
Wed Jul 5 12:01:51 2017 |
Zach | Electronics | Modeling | Force plots-Correct plots, force issue | 2017-07-05
I sorted
out my mathematical lapse in logic and computed
the correct force profiles in the perpendicular |
|
|
368
|
Fri Jul 14 16:43:24 2017 |
Zach | Electronics | Modeling | Force profile matlab script | 2017-07-14
I have completed
a rough, but functioning script that calculates
the modal force profiles. The force values |
|
|
278
|
Thu Jan 26 17:06:59 2017 |
Gabriele | General | Daily Progress | Four fold measurement system installation | Today I installed the four GeNS systems
into the chamber, connected the ESD to the
HV feedthrough and put the periscopes in |
|
|
282
|
Mon Jan 30 15:16:54 2017 |
Gabriele | General | Daily Progress | Four samples in chamber |
checked that the high voltage paths
are working:
the DAC signal
is properly received and amplified by the |
|
|
356
|
Tue Jun 27 14:17:47 2017 |
Zach | Electronics | Modeling | Further plots and improving models | 2017-06-27
I built
a new model of the ESD to determine whether
or not the spikes in the electric field at |
|
|
476
|
Mon Mar 5 11:03:18 2018 |
Gabriele, Anthony | General | Measurements | Fused silica substrated for metallic glass tests | 2018-03-05
10:45am
in chamber:
AK_01 in CR1
AK_02
in CR2
AK_03 in CR3
AK_04 |
|
|
873
|
Tue Jun 9 11:04:28 2020 |
Gabriele | General | Measurements | GaAs S1600805 | 2020-06-09
11:00 am
in chamber
GaAs in CR1
S1600805
in CR2
11:04 am |
|
|
402
|
Thu Aug 10 10:47:54 2017 |
Zach | Electronics | Modeling | Geometry Ratios | 2017-08-10
The attached
plots compare the new and old geometries
with .5 mm and 1 mm sample gaps. They are |
|
|
56
|
Thu Jul 21 12:10:14 2016 |
Gabriele | General | Daily Progress | Glitch hunting | Yesterday I could clearly see the glitches
as jumps in the time domain plot of X and
Y signals, and trace them to somewhat harder |
|
|
54
|
Tue Jul 19 20:19:38 2016 |
Gabriele | Electronics | Configuration | Glitches are a digital artifact | The glitches I saw in the data happens
roughly every second, even though not
exactly on the second. They are suddend jumps |
|
|
57
|
Thu Jul 21 14:58:26 2016 |
Gabriele | Electronics | General | Glitches are of digital origin | So here's the final proof that the
glitches I see are digital:
There is a positive jump |
|
|
61
|
Mon Jul 25 17:44:13 2016 |
Gabriele | Electronics | Characterization | High frequency noise budget | I measured the noise sources limiting the
QPD sensitivity. Unfortunately, I had to
do some MATLAB tricks to get rid of the glitches: |
|
|
62
|
Tue Jul 26 11:45:03 2016 |
Gabriele | Electronics | Characterization | High frequency noise budget | Just to confirm that my noise estimates
make sense, here's a plot of the not-normalized
QPD signal that gives the X motion (sum and |
|
|
226
|
Mon Dec 5 16:35:05 2016 |
Gabriele | Electronics | General | High voltage relais | We want to be able to drive any combination
of the four samples in the new setup, by
using only one HV amplifier. |
|
|
276
|
Wed Jan 25 10:02:23 2017 |
Gabriele | Electronics | Daily Progress | High voltage system in place | This morning I installed in the clean room
the high voltage amplifier and the high voltage
relays. Everything is cabled as planned. |
|
|
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 |
|
|
148
|
Tue Oct 25 11:10:37 2016 |
Gabriele | General | Measurements | Image of S1600433 | This is an image of the sample S1600433
under the microscope, courtesy of GariLynn:
Link |
|
|
386
|
Tue Aug 1 16:10:42 2017 |
Zach | Electronics | Modeling | Improved Gap Sweep | 2017-08-01
I completed
an improved sweep of the gap between the
ESD arms. I resolved some code issues, since |
|
|
286
|
Tue Jan 31 16:55:17 2017 |
Gabriele | General | Daily Progress | Improved autocenter, excitation not working, wandering line | The autocenter script wasn't working
in a very robust way (sometimes the socket
connection to the controller failed, some |
|
|
116
|
Tue Sep 20 15:34:00 2016 |
Gabriele | Optics | Daily Progress | Improved optical lever layout | Goal
Improve the optical setup,
by increasing the response of the QPD to
disk motion. |
|
|
270
|
Fri Jan 20 17:20:20 2017 |
Gabriele | Optics | Daily Progress | Input part of the optical lever setup installed and aligned | Today I installed and aligned part of the
optical components for the optical lever
of the new setup. For the moment being I |
|
|
272
|
Mon Jan 23 16:29:52 2017 |
Gabriele | Optics | Daily Progress | Input part of the optical lever setup installed and aligned | Today I cabled and installed the four QPD,
in a temporary position. I also assembled
four picomotor mounts that will be used for |
|
|
421
|
Wed Aug 23 14:11:13 2017 |
Zach, Gabriele | Electronics | Measurements | Installing ESD Prototype | 2017-08-23
Installed
ESD Prototype design by taping it to the
older design, we then lowered the mount until |
|
|
58
|
Fri Jul 22 14:22:10 2016 |
Gabriele | Electronics | Configuration | Investigations on the signal jumps | [Rolf, Ben, Rich, Gabriele]
Rolf couldn't find any good
explanation on the software side for the |
|
|
450
|
Thu Jan 11 15:40:28 2018 |
Gabriele | General | Measurements | LMA sample (post annealing) | 2018-01-11
3:35pm in
chamber CR1
3:36pm roughing pump
on
3:46pm turbo pump on
Excitations
Quiet |
|
|
432
|
Thu Oct 5 14:28:35 2017 |
Gabriele | General | Measurements | LMA substrate | 2017-10-05
2:17pm in
chamber
LMA substrate after
cleaning in CR1
2:20pm |
|
|
358
|
Thu Jun 29 13:15:01 2017 |
Alastair, Gabriele | General | General | Laser polishing | We laser polished S1600546, 547, 548, 549,
550 and 551 |
|
|
542
|
Fri Jun 22 10:53:06 2018 |
Alena | General | General | Laser failure | One of the HeNe lasers died (the one for
measuring slots CR2 and CR4). It had no outgoing
light when I came in this morning. I connected |
|
|
220
|
Thu Dec 1 11:59:21 2016 |
Gabriele, Alastair | General | General | Laser polishing | Today we laser polished S1600484, S1600485
and S1600486.
|
|
|
205
|
Mon Nov 21 16:21:12 2016 |
Gabriele, Alastair | General | General | Laser polishing of S1600487 | The sample has been laser polished this
afternoon, 0.5mm/s, average power 23 W.
We moved the lens that focuses the |
|
|
208
|
Tue Nov 22 14:11:38 2016 |
Gabriele | General | Measurements | Laser polishing of bad disk improves Q, but they're still not very good | Laser polishing of a sample from the second
batch (S1600487, bad Q as out of the box)
improves the Q values, but they're still |
|
|
101
|
Mon Aug 22 16:59:13 2016 |
Gabriele, Alastair | Optics | Daily Progress | Laser polishing of the disk edges | We set up a test facility for laser polishing
the disk edges, using the CO2 laser in the
TCS laboratory. We focused the beam with |
|