| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
230
|
Wed Jan 9 20:36:42 2008 |
Go | Update | Treasure | Money in lab | Go's Desk. |
|
|
3103
|
Wed Jun 23 12:31:36 2010 |
Gopal | Update | General | 6.16.10-6.23.10 Weekly Update | Summary of This Week's Activities:
6/16: LIGO Orientation; First Weekly
Meeting; 40m tour with Jenne; Removed WFS |
|
|
3166
|
Wed Jul 7 11:35:59 2010 |
Gopal | Update | WIKI-40M Update | 6.30.10 - 7.7.10 Weekly Update | Summary of this Week's Activities:
6/30: 2nd and 3rd drafts of Progress
Report |
|
|
3180
|
Thu Jul 8 16:24:30 2010 |
Gopal | Update | Optic Stacks | Completion of single stack layer | Single layer of stack successfully modeled
in COMSOL. I'm working on trying to add Viton
springs now and extend it to a full stack. |
|
|
3186
|
Fri Jul 9 11:41:58 2010 |
Gopal | Summary | Optic Stacks | Top Optic Layer Complete; Mechanical Tests Giving Problems |
|
7x |
|
3199
|
Mon Jul 12 18:37:10 2010 |
Gopal | Update | Optic Stacks | Eigenfrequency Analysis of Simple Objects | Eigenfrequency analysis has been successfully
completed in COMSOL on both a tutorial camshaft,
as well as a homemade metal bar. |
|
|
3206
|
Tue Jul 13 13:56:29 2010 |
Gopal | Configuration | Optic Stacks | Vitol Material Properties | Viton flouroelastomers have somewhat variable
material properties. The following parameters
are being used for eigenfrequency analysis. |
|
|
3207
|
Tue Jul 13 14:59:04 2010 |
Gopal | Update | Optic Stacks | Eigenfrequency Analysis of Single Stack Complete | Via reconfiguration of Viton parameters
(previously posted), I managed to debug the
COMSOL run time errors and null pointer exceptions. |
|
|
3222
|
Wed Jul 14 19:00:56 2010 |
Gopal | Configuration | Optic Stacks | Vitol Material Properties, REVISED |
|
|
|
3223
|
Wed Jul 14 19:15:26 2010 |
Gopal | Summary | Optic Stacks | REVISION: Eigenfrequency Analysis of Single Stack Complete | My previous eigenfrequency analysis
was incorrect by two orders of magnitude
due to the misuse of Young's Modulus information |
|
|
3224
|
Wed Jul 14 19:36:17 2010 |
Gopal | Update | Optic Stacks | Experimental Confirmation of COMSOL Analysis | I experimentally determined the spring
constant of a single Vitol spring in
order to obtain a rough estimate for the |
|
|
3246
|
Mon Jul 19 16:11:17 2010 |
Gopal | Update | Optic Stacks | Eigenfrequency Analysis of Full Stack | Expanding on the single-layer model, I
added the second, third, and fourth layers
to the stack in COMSOL. Eigenfrequency |
|
|
3252
|
Tue Jul 20 17:38:16 2010 |
Gopal | Configuration | Optic Stacks | Stack Type Clarifications | Some clarification is warranted regarding
the different shapes of stacks. Corrections |
|
|
3255
|
Wed Jul 21 11:57:59 2010 |
Gopal | Update | WIKI-40M Update | 7.14.10-7.21.10 Weekly Update | Summary of this week's activities:
7/14: Analytical calculation of Viton
spring constant; updated Viton values in |
|
|
3261
|
Wed Jul 21 17:41:17 2010 |
Gopal | Configuration | Optic Stacks | Pictures of Stacks | Now that venting is complete, this is a
request for anyone who opens any chamber:
1) Please notify me immediately |
|
|
3276
|
Fri Jul 23 14:26:01 2010 |
Gopal | Update | Optic Stacks | Simple Frequency Response Measurements in COMSOL | Over the past couple days, I discovered
a simple, direct method for calculating
frequency responses with a combination |
|
|
3291
|
Mon Jul 26 11:15:23 2010 |
Gopal | HowTo | COMSOL Tips | Pictures from Transfer Function Tutorial on the Wiki | The attached pictures give a brief overview
of my transfer function measurement procedure
in COMSOL. For more details, please see the |
7x |
|
3298
|
Tue Jul 27 12:02:31 2010 |
Gopal | Update | Optic Stacks | Preliminary Transfer Function Measurements on MC1/MC3 | I have successfully
completed a preliminary transfer function |
|
|
3301
|
Tue Jul 27 18:42:57 2010 |
Gopal | Update | Optic Stacks | Bode Magnitude Plot and Concerns | I completed
the frequency domain analysis mentioned previously |
|
|
3306
|
Wed Jul 28 12:16:03 2010 |
Gopal | Update | SEI | Bode Magnitude Plot and Concerns |
|
|
|
3307
|
Wed Jul 28 12:31:00 2010 |
Gopal | Update | WIKI-40M Update | 7.21.10-7.28.10 Weekly Update | Summary of this week's activities:
7/21: Frequency Domain Analysis of
rectangular bar; discussed with Koji how |
|
|
3322
|
Thu Jul 29 17:11:16 2010 |
Gopal | Update | COMSOL Tips | Including Gravity in COMSOL | [Gopal, Jan]
|
|
|
3324
|
Thu Jul 29 20:43:32 2010 |
Gopal | Summary | Optic Stacks | Modeling Tips and Tilts | I have discovered a method of completely |
|
|
3339
|
Sat Jul 31 04:03:11 2010 |
Gopal | Summary | Optic Stacks | Complete Displacement Translational Transfer Function Matrix | Over the past 36 hours, I've run full-fledged
FDAs on KALLO. |
|
|
3363
|
Wed Aug 4 20:58:22 2010 |
Gopal | Update | WIKI-40M Update | 7.28.10 - 8.4.10 Weekly Update | Summary
of this week's activities: |
|
|
3376
|
Fri Aug 6 15:50:29 2010 |
Gopal | Update | Optic Stacks | (Much Better Looking) Displacement-Displacment Transfer Functions | I reran
the FDA in COMSOL on the MC1/MC3 Stack and
produced the following Displacement-Displacement |
|
|
3380
|
Fri Aug 6 19:46:59 2010 |
Gopal | Update | Optic Stacks | (Much Better Looking) Displacement-Displacment Transfer Functions |
|
|
|
3418
|
Fri Aug 13 01:53:12 2010 |
Gopal | Update | Optic Stacks | Gravity Implementation Confirmed | Time Domain
Analysis on a Driven, Damped Simple Pendulum |
|
|
3142
|
Wed Jun 30 11:35:06 2010 |
Gopal | Update | General | 6.23.10 - 6.30.10 Weekly Update | Summary of this Week's Activities:
6/23: LIGO Safety Tour; Simulink
Controls Tutorial |
|
|
3193
|
Mon Jul 12 11:20:56 2010 |
Gopal | HowTo | COMSOL Tips | Intrusions (Negative Extrusions) | For the sake of future users, I have decided
to periodically add tips and tricks in using
COMSOL that I have figured out, most probably |
6x |
|
3219
|
Wed Jul 14 13:03:04 2010 |
Gopal | Update | WIKI-40M Update | 7.8.10 - 7.14.10 Weekly Update | Summary of this Week's Activities:
Wed. 7/7: COMSOL Busbar tutorials;
began stack design; began base; Viton rubber |
|
|
3397
|
Wed Aug 11 11:51:45 2010 |
Gopal | Update | WIKI-40M Update | 8.5.10 - 8.11.10 Weekly Update | Summary of
this Week's Activities: |
|
|
2193
|
Fri Nov 6 12:56:30 2009 |
Haixing | Update | SUS | Magnet has been levitated |
|
|
|
2202
|
Fri Nov 6 23:02:44 2009 |
Haixing | Update | General | SR785 Spectrum Analyzer | I am using SR785 Spectrum Analyzer now
and also tomorrow.
I will put it back on Sunday. If anyone |
|
|
2203
|
Sat Nov 7 23:50:45 2009 |
Haixing | Update | General | Open-loop transfer function of the magnetic levitation system | I measured the open-loop transfer function
of the magnetic levitation system.
The schematic block diagram for this |
|
|
2245
|
Wed Nov 11 21:30:20 2009 |
Haixing | Update | General | magnetic levitation modelling files uploaded to svn | I have created a directory under the svn.
The link is https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/haixing |
|
|
2307
|
Fri Nov 20 11:32:48 2009 |
Haixing | Update | SUS | Magnetic levitation | I added an integrator to increase
the gain at low frequencies (below 5 Hz).
In addition, I increased |
|
|
2494
|
Sun Jan 10 13:32:09 2010 |
Haixing | Update | SUS | transfer function measurement of the quadrant maglev circuit | I have assembled the circuit and the
control box for the quadrant magnetic
levitation yesterday. The final setup |
6x |
|
2497
|
Sun Jan 10 16:50:34 2010 |
Haixing | Update | SUS | transfer function measurement of the quadrant maglev circuit |
|
|
|
2510
|
Tue Jan 12 13:24:50 2010 |
Haixing | Update | SUS | Quadrant Magnetic Levitation | I have tried to make the quadrant magnetic
levitation work but unfortunately I did
not succeed. During the experiment, I |
|
|
15224
|
Tue Feb 25 19:58:06 2020 |
Hang | Update | IOO | MC2 coil balancing | [Yehonathan, Hang]
We did some quick DC balancing
of the MC2 coil drivers to reduce the l2a |
|
|
15265
|
Wed Mar 11 16:46:25 2020 |
Hang | Update | IOO | MC2 coil balancing | My old scheme was flawed as I used pitch
as the readback. The pitch signal could not
distinguish the cross-coupling due to coil |
|
|
15322
|
Fri May 8 14:27:25 2020 |
Hang | Update | BHD | New SRC gouy phase | [Jon, Hang]
After updating the 40 m finesse
file to incorporate the new SRC length (and |
|
|
15336
|
Mon May 18 18:00:16 2020 |
Hang | Update | BHD | BHD mode-matching study | [Jon, Tega, Hang]
We proposed a few BHD mode-matching telescope
designs and then preformed a few monte-carlo |
|
|
15339
|
Wed May 20 18:45:22 2020 |
Hang | Update | BHD | BHD mode-matching study--corner plot & adjustment requirement | As Rana suggested, we present the
scattering plot of the AS path
mode matching for various variables. |
|
|
15357
|
Tue May 26 19:19:30 2020 |
Hang | Update | BHD | BHD MM-- effects of astigmatism | Please see the attached doc.
I think the conclusion is that
if the AS1 RoC error is not significantly |
|
|
15363
|
Tue Jun 2 14:05:24 2020 |
Hang | Update | BHD | MM telescope actuation range requirments | We computed the required actuation range
for the telescope design in elog:15357. The result |
|
|
15380
|
Mon Jun 8 11:50:02 2020 |
Hang | Update | BHD | Astigmatism and scattering plots | We consider the astigmatism effects of
the stock options. The conclusions are:
1. For the AS path, the stock should work |
6x |
|
15503
|
Tue Jul 28 13:55:11 2020 |
Hang | Update | BHD | Exploring bilinear SRCL->DARM coupling | We explore bilinear SRCL to DARM noise
coupling mechanisms, and show two cases that
by doing BHD readout the noise performance |
|
|
16373
|
Mon Oct 4 15:50:31 2021 |
Hang | Update | Calibration | Fisher matrix estimation on XARM parameters | [Anchal, Hang]
What: Anchal and I measured the
XARM OLTF last Thursday. |
|