| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
14237
|
Mon Oct 8 00:46:35 2018 |
yuki | Configuration | ASC | Y-end table upgrade |
Quote:
|
|
|
14238
|
Mon Oct 8 18:56:52 2018 |
gautam | Configuration | ASC | c1asx filter coefficient file missing | While pointing Yuki to the c1asx servo
system, I noticed that the filter
file for c1asx is missing in the usual chans |
|
|
14239
|
Tue Oct 9 16:05:29 2018 |
gautam | Configuration | ASC | c1tst deleted, c1asy deployed. | Setting up c1asy:
Backed up old c1tst.mdl
as c1tst_old_bak.mdl in /opt/rtcds/userapps/release/cds/c1/models
Copied |
|
|
14257
|
Mon Oct 15 20:11:56 2018 |
yuki | Configuration | ASC | Y end table upgrade plan | Final Procedure Report for Green Locking
in YARM:
Purpose |
|
|
14260
|
Wed Oct 17 20:46:24 2018 |
yuki | Configuration | ASC | Y end table upgrade plan | To do for Green Locking in YARM:
The auto-alignment servo should
be completed. This servo requires many parameters |
|
|
14716
|
Mon Jul 1 20:27:44 2019 |
gautam | Update | ASC | ASX tuning | Summary:
To practise the dither alignment
servo tuning, I decided to make the ASX system |
|
|
14976
|
Thu Oct 17 16:49:53 2019 |
gautam | Update | ASC | PRMI ASC - first pass | I tried implementing a basic PRMI ASC using
the POP QPD as a sensor. The POP22
buildup RMS is reduced by a factor of a few. |
|
|
14985
|
Tue Oct 22 17:35:30 2019 |
gautam | Update | ASC | PRMI ASC - first pass | I made a change to the c1ass model to normalize
the PIT and YAW POP QPD outputs by the SUM
channel. A saturation block is used to prevent |
|
|
14988
|
Wed Oct 23 11:14:21 2019 |
gautam | Update | ASC | PRMI ASC with QPD signals normalized. | Attachment #1 - comparison
of the POP QPD PIT and YAW output signal
spectra with and without them being |
|
|
14991
|
Thu Oct 24 11:58:16 2019 |
gautam | Update | ASC | PRC angular feedforward | Summary:
I'd like to revive the PRC
angular feedforward system. However, |
|
|
15291
|
Thu Apr 2 15:53:01 2020 |
gautam | Update | ASC | PRMI 1f locked for collecting feedforward data | This afternoon, I kept the PRM locked for
~1hour and then measured transfer functions
from the PRM angular actuators to the POP |
|
|
15296
|
Fri Apr 3 17:15:53 2020 |
gautam | Update | ASC | POP angular FF filters trained and tested | Summary:
Using the data I collected yesterday,
the POP angular FF filters have been trained. |
|
|
15297
|
Mon Apr 6 12:26:07 2020 |
rana | Update | ASC | POP angular FF filters trained and tested | that's pretty great performance. maybe
you can also upload some code so that we
can do it later too - or maybe in the 40m |
|
|
15298
|
Mon Apr 6 16:46:40 2020 |
gautam | Update | ASC | POP angular FF filters trained and tested | I don't have a recent measurement of
the optical gain of this config so I can't
undo the loop, but in-loop performance doesn't |
|
|
15318
|
Tue May 5 23:44:14 2020 |
gautam | Update | ASC | IMC WFS | Summary:
I've been thinking about the
IMC WFS. I want to repeat the sort of analysis |
|
|
15320
|
Thu May 7 09:43:21 2020 |
rana | Update | ASC | IMC WFS | This
is the doc from Keita Kawabe on why the
WFS heads should be rotated. |
|
|
15321
|
Thu May 7 10:58:06 2020 |
gautam | Update | ASC | IMC WFS | OK so the QPD segments are in the "+"
orientation when the 40m IMC WFS heads are
mounted at 45 deg. I thought "+" |
|
|
15368
|
Wed Jun 3 02:14:32 2020 |
gautam | Update | ASC | PRC ASC improves arm transmission RIN | Summary:
I implemented an ASC servo for
the PRC, with the POP QPD as a sensor, and |
|
|
15418
|
Fri Jun 19 16:30:09 2020 |
gautam | Update | ASC | Some thoughts about ASC | Summary:
In ELOG
15368, I had claimed that the POP QPD |
|
|
15458
|
Tue Jul 7 14:06:10 2020 |
gautam | Update | ASC | Some more thoughts about ASC | Summary:
I want to be able to run the dither
alignment servo with the PRFPMI locked - |
|
|
15682
|
Wed Nov 18 22:49:06 2020 |
gautam | Update | ASC | Some thoughts about AS WFS electronics | Where do we
want to install the interface and readout |
|
|
15683
|
Sun Nov 22 21:09:37 2020 |
gautam | Update | ASC | Planned mods for WFS head | Attachment
#1 - Proposed mods |
|
|
15687
|
Mon Nov 23 23:27:43 2020 |
Koji | Summary | ASC | Q3000 characterization | Last week and this week I've been working
on the characterization of the Q3000 QPDs.
The QPDs were named 81, 82, 83, and 94. |
|
|
15689
|
Wed Nov 25 18:18:41 2020 |
gautam | Update | ASC | Planned mods for WFS head | I am confused by the discussion during
the call today. I revisited Hartmut's
paper - the circuit in Fig 6 is essentially |
|
|
15690
|
Wed Nov 25 18:30:23 2020 |
gautam | Update | ASC | Some thoughts about AS WFS electronics | An 8 channel whitening chassis was prepared
and tested. I measured:
TF from input to output |
|
|
15691
|
Sat Nov 28 21:44:53 2020 |
rana | Update | ASC | Planned mods for WFS head | I don't think your simulation looked
inaccurate (at least not to me). In my opinion,
we just want to minimize any excess noise |
|
|
15697
|
Wed Dec 2 23:07:19 2020 |
gautam | Update | ASC | Electrical LO signal for AS WFS | I'm thinking of making some modifications
to the RF distribution box in 1X2, so as
to have an extra 55 MHz pickoff. Koji already |
|
|
15702
|
Thu Dec 3 13:55:52 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | I got a bit confused by your description.
The demod board claims
that the nominal power at each LO port is |
|
|
15704
|
Thu Dec 3 20:38:46 2020 |
gautam | Update | ASC | Electrical LO signal for AS WFS | I removed the Frequency Generation box
from the 1X2 rack. For the time being, the
PSL shutter is closed, since none of the |
|
|
15705
|
Thu Dec 3 21:14:38 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | Let's use RG405 for better shielding.
It is not too stiff. The bending (just
once) does not break the cable. |
|
|
15706
|
Thu Dec 3 21:44:49 2020 |
gautam | Update | ASC | Electrical LO signal for AS WFS | I'm open to either approach. If the
full replacement requires a lot of machining,
maybe I will stick to just the 55 MHz line. |
|
|
15707
|
Fri Dec 4 03:02:40 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | 1. That's true. But we are already
in that regime with the Var attn at 0dB,
aren't we? We can reduce the input to |
|
|
15710
|
Fri Dec 4 22:41:56 2020 |
gautam | Update | ASC | Freq Gen Box revamp | This turned out to be a much more involved
project than I expected. The layout is complete
now, but I found several potentially damaged |
|
|
15711
|
Sat Dec 5 20:44:35 2020 |
gautam | Update | ASC | Freq Gen Box re-installed | This work is now complete. The box was
characterized and re-installed in 1X2. I
am able to (briefly) lock the IMC and see |
6x |
|
15731
|
Thu Dec 10 22:46:57 2020 |
gautam | Update | ASC | WFS head assembled | The assembly of the head is nearly complete,
I thought I'd do some characterization
before packaging everything up too nicely. |
|
|
15736
|
Thu Dec 17 15:23:56 2020 |
gautam | Update | ASC | WFS head characterization | Summary:
I think the WFS head performs satisfactorily.
The (input-referred) dark |
|
|
15920
|
Mon Mar 15 20:22:01 2021 |
gautam | Update | ASC | c1rfm model restarted | On Friday, I felt that the ASC performance
when the PRFPMI was locked was not as good
as it used to be, so I looked into the situation |
|
|
15953
|
Mon Mar 22 16:29:17 2021 |
gautam | Update | ASC | Some prep for AS WFS commissioning |
Added rough cts2mW calibration
filters to the quadrants, see |
|
|
16267
|
Mon Aug 2 16:18:23 2021 |
Paco | Update | ASC | AS WFS MICH commissioning | [anchal, paco]
We picked up AS WFS comissioning
for daytime work as suggested by gautam. |
|
|
16909
|
Fri Jun 10 20:11:46 2022 |
yuta | Update | ASC | Yarm ASS re-tuning in progress | [Anchal, Yuta]
We tried to re-tune Yarm ASS today. |
|
|
16911
|
Mon Jun 13 20:26:09 2022 |
yuta | Update | ASC | Yarm ASS re-tuning in progress -part 2- | [Anchal, Yuta]
We are still in the progress of re-commissioning |
|
|
16915
|
Tue Jun 14 20:57:15 2022 |
Anchal | Update | ASC | Yarm ASS working now | I finally got YARM AS to work today. It
is hard to describe what worked, I did a
lot of monkey business and some dirty offset |
|
|
16930
|
Mon Jun 20 19:46:04 2022 |
Tomislav | Update | ASC | Simulation plots | In the attachment please find IMC ASC simulation
plots. Let me know what you think, if you
want some other plots, and if you need any |
|
|
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 |
|