| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
52
|
Tue Jul 19 17:15:37 2016 |
Gabriele | Facility | Daily Progress | Vacuum pressure acquired | [Alena, Gabriele]
We connected the analog output
of the vacuum gauge controller to one of |
|
|
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 |
|
|
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 |
|
|
55
|
Wed Jul 20 10:26:40 2016 |
Gabriele | Electronics | Configuration | Are glitches a digital artifact? | Not so sure anymore...
those glitches do not happen
at regular times
I tried to send |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
59
|
Mon Jul 25 12:24:06 2016 |
Gabriele | Electronics | Configuration | More on the signal jumps | Here are two more tests I did this morning
removed the DAC card from
the cymac and the models, and restarted everything: |
|
|
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 |
|
|
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 |
|
|
63
|
Wed Jul 27 08:59:12 2016 |
Gabriele | Electronics | General | Pressure now in torr | The old channel X3:CR1-PRESSURE_LOGTORR
does not exist anymore. The new channel is
now directly in torr and it is called X3:CR1-PRESSURE_TORR. |
|
|
64
|
Wed Jul 27 10:19:36 2016 |
Gabriele | Electronics | Configuration | Last finding in the signal jump saga | This plot shows a signal which is generated
purely digitally inside a code that I was
testing. |
|
|
65
|
Wed Jul 27 11:27:11 2016 |
Gabriele | Facility | General | Pumps stopped and venting | 11:25am LT: closed valve between roughing
and turbo pumps, switched off both pumps.
Turbo pump is slowing down |
|
|
66
|
Wed Jul 27 15:43:02 2016 |
Gabriele | Facility | Daily Progress | Vacuum chamber dismantled and ready for cleaning | [Alena, Gabriele]
As decided at out Red Door meeting,
we're going to clean the vacuum chamber |
|
|
67
|
Thu Jul 28 13:58:48 2016 |
Alena, Gabriele | Clean | Daily Progress | The old chamber is now being cleaned and baked | Cleaned the chamber in the washing machine
at 40m and started 48 baking at 120 C |
|
|
68
|
Thu Jul 28 14:01:27 2016 |
Alena | General | Daily Progress | Clean room | Ordered the clean room (hardware+hepa filters)
and vacuum gauges |
|
|
69
|
Thu Jul 28 17:15:22 2016 |
Gabriele | Electronics | Daily Progress | ADC/DAC interfaces upgrade | Installed the ADC and DAC boards into a
proper box. Also, swapped the temporary DAC
board (with cale hack) with the final one. |
|
|
70
|
Fri Jul 29 14:08:31 2016 |
Gabriele | General | Daily Progress | Peak tracking code for real time model | Summary
I wrote a C function
to reconstruct the amlplitude and frequency
of a line. It can be added as a block into |
|
|
71
|
Mon Aug 1 16:56:57 2016 |
Gabriele | Electronics | Daily Progress | Populated four new QPD boards | Today I populated four more QPD boards.
All components are installed, except for
the QPD themselves. |
|
|
72
|
Tue Aug 2 15:58:12 2016 |
Gabriele | Electronics | Daily Progress | Six QPD functional and tested | I finished populating the new four QPD
boards, and fixed the first one I populated
weeks ago. I tested all five new boards: |
|
|
73
|
Tue Aug 2 16:00:32 2016 |
Gabriele | Electronics | Characterization | More on the signal jumps | So I’m
sending a 1.123 Hz sinusoid into the ADC, |
|
|
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 |
|
75
|
Wed Aug 10 09:39:38 2016 |
Gabriele | Electronics | Daily Progress | Annuntio vobis gaudium magnum: habemus Cymac | Yesterday I cloned the cymac2 disk and
installed it into the cymac3.
Jamie tweaked a few things (I can't |
|
|
76
|
Wed Aug 10 10:04:35 2016 |
Gabriele | Mechanics | Daily Progress | The prototype of the disk retain system is here | Yesterday we received the prototype of
the disk suspension and retain system. Everything
looks good. I checked that the disk fits |
6x |
|
77
|
Thu Aug 11 08:45:19 2016 |
Gabriele | General | General | QPD signals with dielectric filter | I installed a dielectric laser line filter
(Thorlabs FLH05633-5, center wavelength 633
nm, FWHM 5 nm) in front of the QPD. In this |
|
|
78
|
Thu Aug 11 09:10:01 2016 |
Gabriele | Electronics | Configuration | Real time model | Compiled and installed an updated real
time model. It acquires the four QPD segments,
compute sum and differences, and normalize. |
|
|
79
|
Thu Aug 11 10:59:39 2016 |
Gabriele | Electronics | Configuration | Quadrant calibration | I cross checked the calibration of the
sum channel with a power meter. Now
all quadnant signals X3:Q?_OUT and the sum |
|
|
80
|
Fri Aug 12 10:33:14 2016 |
Gabriele | Electronics | Configuration | Storage added to cymac3 | Installed two new 2TB disks into the cymac3.
Also, the main disk has a 1TB partition with
the operating system, so I created a new |
|
|
81
|
Sat Aug 13 11:17:17 2016 |
Gabriele | Facility | Daily Progress | Spot the differences | |
|
|
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 |
|
|
83
|
Sun Aug 14 11:40:29 2016 |
Gabriele | Electronics | Daily Progress | Some python code | Today I wrote some auxiliary functions
that will be useful for the measurement system:
noise.py: set of functions |
|
|
84
|
Sun Aug 14 18:13:52 2016 |
Gabriele | Electronics | Daily Progress | Progress on the user interface | Some progress on writing the user interface:
|
|
|
85
|
Sun Aug 14 18:26:19 2016 |
Gabriele | General | General | Plans for the automatic mode search | Here's how I imagine the mode search
to proceed:
the user select the list |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
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 |
|
|
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 |
|
94
|
Sun Aug 21 08:51:22 2016 |
Gabriele | General | Daily Progress | New disk installed | Vented the chamber. Installed a new disk
(MO 03). The one I measured yesterday is
now named MO 02 and it is the one with the |
|
|
95
|
Sun Aug 21 13:45:56 2016 |
Gabriele | Optics | Daily Progress | Wierd behavior of ring downs and Improved setup | The last two ring downs I measured today
showed a weird behavior of the lowest modes:
|
|
|
96
|
Sun Aug 21 15:36:16 2016 |
Gabriele | General | Daily Progress | New test | Roughing pump stopped at about 3:30:30pm.
HV amplifier on at 3:33:30pm, excitation
at 3:35:30pm. Recentered QPD at 3:36pm |
|
|
97
|
Sun Aug 21 17:16:03 2016 |
Gabriele | General | Daily Progress | Ring down measurement with new disk | After fixing the setup, the measurement
with the new disk looks great. After more
than one hour the first two modes are still |
22x |
|
98
|
Sun Aug 21 17:41:34 2016 |
Gabriele | General | Daily Progress | New test | I checked the status at about 5:20pm, the
turbo pump was in error and spinning down,
since the roughing pump has been off for |
|
|
99
|
Mon Aug 22 08:29:24 2016 |
Gabriele | General | Daily Progress | New test | Restarted roughing and turbo pump at about
8:10am.
|
|
|
100
|
Mon Aug 22 12:01:52 2016 |
Gabriele | General | General | Tests of the day | Disk excited at 12:01pm. Exited the room
at 12:03pm.
Opened the chamber at about 2:30pm, |
|
|
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 |
|