| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
14211
|
Sun Sep 23 17:38:48 2018 |
yuki | Update | ASC | Alignment of AUX Y end green beam was recovered | [ Yuki, Koji, Gautam ]
An alignment of AUX Y end green
beam was bad. With Koji and Gautam's |
|
|
14212
|
Sun Sep 23 19:32:23 2018 |
yuki | Configuration | ASC | Y end table upgrade plan | [ Yuki, Gautam ]
The setup I designed before has
abrupt gouy phase shift between two steering |
|
|
14214
|
Mon Sep 24 11:09:05 2018 |
yuki | Configuration | ASC | Y end table upgrade plan | [ Yuki, Steve ]
With Steve's help, we checked
a new lens can be set soon after dichroic |
|
|
14216
|
Tue Sep 25 18:08:50 2018 |
yuki | Configuration | ASC | Y end table upgrade plan | [ Yuki, Gautam ]
We want to remotely control steeing
PZT mirrors so its driver is needed. |
|
|
14218
|
Thu Sep 27 14:02:55 2018 |
yuki | Configuration | ASC | PZT driver board verification | [ Yuki, Gautam ]
I fixed the input terminal that
had been off, and made sure PZT driver |
|
|
14219
|
Sun Sep 30 20:14:51 2018 |
yuki | Configuration | ASC | QPD calibration | [ Yuki, Gautam, Steve ]
Results:
I calibrated a QPD (D1600079, V1009) |
|
|
14220
|
Mon Oct 1 12:03:41 2018 |
not yuki | Configuration | ASC | PZT driver board verification | I assume this QPD set is a D1600079/D1600273
combo.
How much was the SUM output during |
|
|
14221
|
Mon Oct 1 13:33:55 2018 |
yuki | Configuration | ASC | QPD calibration |
Quote:
|
|
|
14222
|
Mon Oct 1 20:39:09 2018 |
gautam | Configuration | ASC | c1asy | We need to set up a copy of the c1asx |
|
|
14224
|
Tue Oct 2 18:50:53 2018 |
yuki | Configuration | ASC | PZT mirror calibration | [ Yuki, Gautam ]
I calibrated PZT mirrors. The ROUGH
result was attached. (Note that some errors and |
|
|
14226
|
Wed Oct 3 14:24:40 2018 |
yuki | Configuration | ASC | Y end table upgrade plan | Interim Procedure Report:
Purpose
The current setup of AUX Y-arm |
|
|
14227
|
Wed Oct 3 18:15:34 2018 |
yuki | Configuration | ASC | AI board improvement | [ Yuki, Gautam ]
I improved Anti-Imaging board (D000186-Rev.D),
which will be put between DAC port and |
|
|
14228
|
Thu Oct 4 00:44:50 2018 |
yuki | Configuration | ASC | AI board improvement | [ Yuki, Gautam ]
I made a cable which connects DAC
port (40 pins) and AI board (25 pins). I |
|
|
14230
|
Thu Oct 4 22:15:30 2018 |
yuki | Configuration | ASC | Y-end table upgrade | Before changing setup at Y-end table, I
measured the status value of the former setup
as follows. These values will be compared |
|
|
14231
|
Fri Oct 5 00:46:17 2018 |
Koji | Configuration | ASC | Y-end table upgrade | ???
The SHG crystal has the conversion
efficiency of ~2%W (i.e. if you have 1W input |
|
|
14232
|
Fri Oct 5 17:32:38 2018 |
yuki | Configuration | ASC | Y-end table upgrade | I measured it with the wrong setting of
a powermeter. The correct ones are here:
beam power going into doubling |
|
|
14233
|
Fri Oct 5 17:47:55 2018 |
gautam | Configuration | ASC | Y-end table upgrade | What
about just copying the Xend |
|
|
14234
|
Fri Oct 5 22:49:22 2018 |
yuki | Configuration | ASC | Y-end table upgrade | I designed a new layout. It has good mode-matching
efficiency, reasonable sensitivity to component
positions, good Gouy phase separation. I'm |
|
|
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 |
|