| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
16934
|
Tue Jun 21 18:41:46 2022 |
Tomislav | Update | ASC | Simulation plot | In the attachment please find a comparison
of error signals of simulation and reality.
For C1:IOO-WFS1/2_PIT_IN1 excess signal ('belly') |
|
|
16937
|
Tue Jun 21 22:22:37 2022 |
Tomislav | Update | ASC | Plots | In the attachment please find a comparison
of error signals of simulation and reality
after including air turbulence as input noise. |
|
|
16948
|
Sat Jun 25 22:18:41 2022 |
Tomislav | Update | ASC | Simulation and reality comparisons | In the attachment please find plots comparing
controller output, local damping output,
and error signals. |
|
|
17217
|
Mon Oct 31 21:04:43 2022 |
Koji | Update | ASC | WFS inspection | Inspected the lab to see what we can do
about the IFO WFS:
WFS heads
1 |
|
|
17255
|
Thu Nov 10 20:46:32 2022 |
rana | Update | ASC | IMC WFS servo diagnosis | To check out the bandwidths and
cross-coupling in the WFS loops, I made a
script (attached) to step the offsets around, |
|
|
17272
|
Wed Nov 16 12:53:36 2022 |
rana | Update | ASC | IMC WFS ongoing | In the middle of aportioning gains and
signs in the IMC WFS screen, so beware. More
updates soon. |
|
|
17288
|
Fri Nov 18 23:21:54 2022 |
rana | Update | ASC | IMC WFS ongoing | On Wednesday, I did some rework of the
MC WFS gains. I think it should still work
as before as long as the overall input gain |
|
|
17311
|
Thu Nov 24 15:37:45 2022 |
Anchal | Update | ASC | IMC WFS output matrix diagonalization effort | I tried following the steps and the method
I was using converged to same output matrix
upto 2 decimal points but there is still |
|
|
17320
|
Mon Nov 28 20:14:27 2022 |
Anchal | Update | ASC | AS WFS proposed path to IMC WFS heads | In Attachment 1, I give a plan for the
proposed path of AS beam into the IMC WFS
heads to use them temporarily as AS WFS. |
|
|
17332
|
Sat Dec 3 17:42:25 2022 |
Anchal | Update | ASC | IMC WFS Fixed for now | Today I did a lot of steps to eventually
reach to WFS locking stably for long times
and improving and keeping the IMC transmission |
|
|
17334
|
Sun Dec 4 16:44:04 2022 |
Anchal | Update | ASC | IMC WFS Fixed for now | Today, I worked on WFS loop output matrix
for PIT DOFs.
I began with the matrix |
|
|
17336
|
Mon Dec 5 16:24:45 2022 |
Anchal | Update | ASC | IMC WFS servo diagnosis | Also reply to: 40m/17255
I ran the toggleWFSoffsets.py
script to generate a step response of the |
|
|
17337
|
Mon Dec 5 20:02:06 2022 |
Anchal | Update | ASC | IMC WFS heads electronic feasibility test for using for Arm ASC | I took transfer function measurement of
WFS2 SEG4 photodiode between 1 MHz to 100
MHz in a linear sweep. |
|
|
17342
|
Tue Dec 6 16:52:26 2022 |
Anchal | Update | ASC | IMC WFS heads electronic feasibility test for using for Arm ASC | I tested teh WFS demod board for possibility
of demodulating 11 MHz or 55 MHz signal with
it. It definitely has some bandpass filter |
|
|
17344
|
Tue Dec 6 17:40:13 2022 |
Koji | Update | ASC | IMC WFS heads electronic feasibility test for using for Arm ASC | We have spare WFS demods in a plastic box
along the Y arm. So you don't need to
modify the IMC demod boards, which we want |
|
|
17348
|
Thu Dec 8 20:40:14 2022 |
Anchal | Update | ASC | WFS demodulation board modification attempt | Based on the previous two elog posts, Koji
and I decided that we should use 11 MHz signal
for arm cavity ASC and modify a spare WFS |
|
|
17349
|
Fri Dec 9 05:04:45 2022 |
rana | Summary | ASC | MC WFS sensing matrix measurement | I made a script to toggle the offsets in
the MC SUS so that we can see the resulting
error signals in the MC WFS / MC-TRANS_QPD. |
|
|
17350
|
Fri Dec 9 10:08:54 2022 |
Radhika | Update | ASC | YEND green alignment chronicles | Today I set out to align and lock the
YEND green laser, and observe the expected
PDH error signal and PZT control signal. |
|
|
17354
|
Fri Dec 9 18:32:11 2022 |
Koji | Summary | ASC | MC WFS sensing matrix measurement | [Rana, Koji]
The IMC WFS pitch Output
Matrix was recalculated based on a DC Sensing |
|
|
17355
|
Fri Dec 9 21:54:40 2022 |
Radhika | Update | ASC | Moku digital filter for low-frequency resonances (ALS/calibration) | [Radhika, Paco]
I modeled a digital filter for
adding a resonance at a desired frequency |
|
|
17356
|
Fri Dec 9 23:44:14 2022 |
rana | Summary | ASC | MC WFS sensing matrix measurement | with the new output matrix, we repeated
the diagonalization script that Anchal ran
previously. In the attached plot you can |
|
|
17363
|
Fri Dec 16 21:55:54 2022 |
Anchal | Update | ASC | WFS demodulation board modification attempt 2 - sort of working | [Koji, Anchal]
short version: We checked signals
at different points in the circuit to make |
|
|
17365
|
Sat Dec 17 16:56:19 2022 |
Anchal | Update | ASC | WFS demodulation board modification - further study | I played with the PLL bit more today to
understand the issue. From what I understand,
the following is the summary: |
|
|
17368
|
Tue Dec 20 23:32:58 2022 |
rana | Update | ASC | WFS demodulation board modification - further study | That's great - I think this solution
will be best. Having the PLLs actually gives
us some problems - the square wave action |
|
|
17391
|
Tue Jan 10 20:24:29 2023 |
Anchal | Update | ASC | WFS demodulation board 111B - Working as expected | I've completed the modifications on
two WFS demod boards. This required replacing
all 8 mixer ICs on each board. I also tuned |
|
|
17393
|
Wed Jan 11 17:05:55 2023 |
Anchal | Update | ASC | WFS demodulation board 112B - Working as expected | The other modified board 112B has been
fixed and tested now. See the results attached.
The issue was in some malfunctioning OP284 |
|
|
17406
|
Thu Jan 19 20:35:54 2023 |
Anchal | Update | ASC | Installed 2 flipper mirrors for handingl MC reflection beam to camera | Today I installed two flipper mirrors M3
and M4 (see attached photo) to create alternate
route for MC reflection camera beam. Both |
|
|
17407
|
Fri Jan 20 20:13:20 2023 |
Anchal | Update | ASC | Installed 2 flipper mirrors for handingl MC reflection beam to camera | After discussions with Yuta, I figured
that a better optical layout is possible
which does not interfere with the existing |
|
|
17408
|
Sat Jan 21 15:32:40 2023 |
Anchal | Update | ASC | AS WFS path nominally set | I've completed the beam redirection
path for AS beam to WFS heads in a nominal
way. By that I mean that all mirrors (M1, |
|
|
17412
|
Mon Jan 23 20:50:58 2023 |
Anchal | Update | ASC | AS WFS path beam profiled | I measured the expected beam profile by
WFS photodiodes by measuring the beam when
mode cleaner was unlocked from the point |
|
|
17416
|
Tue Jan 24 21:04:59 2023 |
Anchal | Update | ASC | AS WFS path beam profiled | I completed the mode matching calculation
today and found good solution with 360.6
mm ROC PLCX lens at -1.2 m from z=0 point. |
|
|
17425
|
Thu Jan 26 15:56:30 2023 |
Anchal | Update | ASC | 1X1 -5V sorenson tripped | [Yuta, Anchal]
|
|
|
17444
|
Fri Feb 3 12:50:47 2023 |
Anchal | Update | ASC | AS WFS model changes and phase calibration | Model and medm changes
After
incrementally doing the model changes, I
found out that the model was failing to build |
|
|
17448
|
Sat Feb 4 14:55:25 2023 |
Anchal | Update | ASC | DC sensing matrix for AS WFS for YARM | Filter and scripts setup
I
copied IOO_WFS1_I filter bank to AWS_WFS1/2_I/Q
filter banks to copy the dewhitening and |
|
|
17453
|
Mon Feb 6 20:44:34 2023 |
Anchal | Update | ASC | YARM WFS First Attempt - Success | I uploaded this measured output matrix
to the YARM WFS model:
|
|
|
17454
|
Tue Feb 7 11:12:44 2023 |
rana | Update | ASC | YARM WFS First Attempt - Success | It would be great if you could calibrate
these ASC channels into physical units (e.g.
urad or nrad). I am curious to see how the |
|
|
17456
|
Wed Feb 8 12:25:42 2023 |
Anchal | Update | ASC | YARM WFS Loop Step Response | I did a quick step response test today
with YARM WFS loops running. Steps were put
in as offsets in channels C1:SUS-I/ETMY_ASCPIT/YAW_OFFSET |
|
|
17465
|
Wed Feb 15 12:07:35 2023 |
Anchal | Update | ASC | ASC model updated to take inputs from IMC WFS | I have updates the ASC model inside c1ioo.mdl
file to take inputs from IMC WFS when selected
with AS option (on the left side of AS WFS |
|
|
17484
|
Sun Feb 26 00:13:55 2023 |
Alex | Configuration | ASC | IOO MC PIT/YAW gain change | The following changes were made to the
WFS MASTER IMC Pitch and Yaw gains:
Gain values for the pitch and yaw |
|
|
13157
|
Tue Aug 1 19:23:06 2017 |
rana | Update | ALS | X - arm alignment | Rana, Naomi
We dither locked the X arm and
then aligned the green beam to it using the |
|
|
13177
|
Wed Aug 9 12:35:47 2017 |
gautam | Update | ALS | Fiber ALS | Last week, we were talking about reviving
the Fiber ALS box. Right now, it's not
in great shape. Some changes to be made: |
|
|
13180
|
Wed Aug 9 19:21:18 2017 |
gautam | Update | ALS | ALS recovery | Summary:
Between frequent MC1 excursions,
I worked on ALS recovery today. Attachment |
|
|
13204
|
Mon Aug 14 16:24:09 2017 |
gautam | Update | ALS | Fiber ALS | Today, I borrowed the fiber microscope
from Johannes and took a look at the fibers
coupled to the PDs. The PD labelled " |
|
|
13222
|
Wed Aug 16 20:24:23 2017 |
gautam | Update | ALS | Fiber ALS | Today, with Johannes' help, I cleaned
the fiber tips of the photodiodes. The effect
of the cleaning was dramatic - see Attachments |
|
|
13229
|
Fri Aug 18 23:59:53 2017 |
gautam | Update | ALS | X Arm ALS lock | [ericq, gautam]
I was just getting the
IFO aligned, and single arm lock going, when |
|
|
13230
|
Sat Aug 19 01:35:08 2017 |
ericq | Update | ALS | X Arm ALS lock | My motivation tonight was to get an up-to-date
spectrum of a calibrated measurement
of the out-of-loop displacement of an arm |
|
|
13237
|
Mon Aug 21 23:38:55 2017 |
gautam | Update | ALS | ALS out-of-loop noise | I worked a little bit on the Y arm ALS
today.
Started by locking the |
|
|
13238
|
Tue Aug 22 02:19:11 2017 |
gautam | Update | ALS | ALS OLTFs | Attachment #1 shows the
results of my measurements tonight (SR785
data in Attachment #2). |
|
|
13244
|
Tue Aug 22 23:27:14 2017 |
rana | Update | ALS | ALS OLTFs | Didn't someone look at what the OLG
req. should be for these servos at some point?
I wonder if we can make a parallel digital |
|
|
13246
|
Wed Aug 23 17:22:36 2017 |
gautam | Update | ALS | Fiber ALS - reinstalled | I completed the revamp of the box, and
re-installed the box on the PSL table today.
I think it would be ideal to install this |
|