| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
155
|
Tue Nov 1 15:34:49 2016 |
Alena, Calum | General | | Annealing run | Annealing run (449-453) on 3" wafers
- Crime 11/01/2016 https://dcc.ligo.org/T1600507 |
|
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430
|
Thu Sep 14 15:59:10 2017 |
Gabriele | Facility | | All wrapped up for Saturday plumbing work | |
|
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263
|
Wed Jan 18 14:29:16 2017 |
Alena | General | Annealing | Annealing run (489-490) on 3" wafers - Crime 01/18/2017 |
Started annealing run Annealing run
(489-490) on 3" wafers - Crime 01/18/2017 |
|
|
269
|
Fri Jan 20 16:00:36 2017 |
Alena | General | Annealing | Annealing run (491-496) on 3" wafers - Crime 01/20/2017 | Started Annealing run (491-496) on
3" wafers - Crime 01/20/2017 https://dcc.ligo.org/LIGO-T1700036
Will be done by Monday |
|
|
350
|
Wed Jun 21 17:04:20 2017 |
Alena | General | Annealing | Annealing run (541-542) on 3" wafers - Crime 06/25/2017 | Started an annealing run https://dcc.ligo.org/LIGO-T1700271
Will be ready by Friday morning
|
|
|
355
|
Tue Jun 27 09:20:16 2017 |
Alena | General | Annealing | Annealing run (546-551) on 3" wafers - Crime 06/27/2017 | Started annealing run https://dcc.ligo.org/T1700293
Will be ready by June 28th afternoon |
|
|
453
|
Thu Jan 25 15:33:51 2018 |
Gabriele, Ben | General | Annealing | Annealing of 50mm disks | Annealing of 8 fused silica substrates
(50mm/0.5mm) started at 3:30pm, January 25th
2018. Standard program: 9 hours ramp up to |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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" |
|
|
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 |
|
|
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 |
|
|
47
|
Mon Jul 18 13:42:46 2016 |
Gabriele | Electronics | Characterization | QPD signal convention | The QPD quadrants are wired accoridng to
the following convention
|
|
|
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 |
|
|
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, |
|
|
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
|
|
|
207
|
Tue Nov 22 08:21:35 2016 |
Gabriele | Electronics | Characterization | ADC saturation | Last night measurements didn't work
well: even without exciting the modes, the
ADC was saturating because of the low frequency |
10x |
|
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 |
|
|
413
|
Wed Aug 16 14:35:05 2017 |
Gabriele | General | Computers | Workstation is down | While I was working, the network connection
went down. I tried to reboot the workstation,
but I won't boot anymore. |
|
|
418
|
Fri Aug 18 14:05:36 2017 |
Gabriele | General | Computers | Workstation is now up | Reinstalled Debian 8, all packages and
CDS software.
Everything seems to be working |
|
|
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 |
|
|
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
|
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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: |
|
|
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 |
|
|
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: |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
122
|
Thu Sep 22 13:39:40 2016 |
Gabriele | Optics | Configuration | Updated design for the new C.Ri.Me. setup | Today I measured the amount of space available
on the table for the new (4-fold) C.Ri.Me.
setup. It's 1050 x 1220 mm, with the |
|
|
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. |
|
|
126
|
Mon Sep 26 15:54:01 2016 |
Gabriele | Facility | Configuration | Moved vacuum controllers | I moved the turbo pump controller out of
the clean room. Also, I installed the gauge
controller on the Cymac rack. |
|
|
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. |
|
|
143
|
Fri Oct 21 15:27:15 2016 |
Gabriele | Electronics | Configuration | Removed low pass filter in SUM | I removed the low pass filter in the QPD
SUM signal, used for normalization. This
reduced a lot the bump at ~20kHz due to laser |
|
|
158
|
Fri Nov 4 11:31:11 2016 |
Gabriele | Electronics | Configuration | Autocenter control and model modifications | Removed the peak meter lock from the model,
since it's not used
Added and EPICS binary bit to control |
|
|
173
|
Thu Nov 10 14:13:34 2016 |
gabriele | Electronics | Configuration | MATLAB code to control Thorlabs stages | To be used to automate the laser polishing. |
|
|
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. |
|