ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
11484
|
Thu Aug 6 11:45:01 2015 |
Jessica | Update | General | ALS Delay Line front panel testing | Koji had suggested that I sync up the two
function generators to ensure that they have
the same base frequency and so that crosstalk |
   |
11041
|
Tue Feb 17 00:24:47 2015 |
rana, jenne | Update | LSC | ALS Fool filter updated for more cancellation | Today
we measured the TFs again and then updated
the filter in the POY -> ALS FF path so |
 |
11047
|
Wed Feb 18 17:51:40 2015 |
ericq | Update | LSC | ALS Fool impulse response | Koji raised a good question about the step
response I wrote about. Namely, if the UGF
of the ALS servo is around 100Hz, we would |
|
11048
|
Wed Feb 18 19:06:40 2015 |
Koji | Update | LSC | ALS Fool impulse response | |
|
11046
|
Wed Feb 18 01:58:51 2015 |
ericq | Update | LSC | ALS Fool single arm performance | I'm playing around with the lastest
ALS fool feedforward on the Yarm, and I like
what I'm seeing. |
   |
9283
|
Thu Oct 24 19:12:45 2013 |
Masayuki | Update | Green Locking | ALS OFFSETTER calibration | I calibrated the ALS-OFFSETTER output.
I measured the FSR of cavity in unit |
|
9284
|
Thu Oct 24 21:46:18 2013 |
Koji | Update | Green Locking | ALS OFFSETTER calibration |
|
|
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 |
|
15157
|
Sun Jan 26 14:40:55 2020 |
gautam | Update | ALS | ALS OOL noise | In preparation for resuming IFO locking
activities, I measured the ALS noise with
the arm lengths locked to IR, AUX laser frequencies |
|
14918
|
Mon Sep 30 18:20:26 2019 |
gautam | Update | ALS | ALS OOL noise - a first look | Attachment #1 shows a
first look at the IR ALS noise after my re-coupling |
|
15220
|
Fri Feb 21 20:44:18 2020 |
shruti | Update | ALS | ALS OOL noise and PDH | [Meenakshi, Shruti]
In order to adjust the relative
phase for PDH locking, we used the Siglent |
 |
15221
|
Sun Feb 23 18:15:22 2020 |
rana | Update | ALS | ALS OOL noise and PDH | to
make the comparisons meaningfully |
|
15211
|
Thu Feb 13 21:30:55 2020 |
shruti | Update | ALS | ALS OOL noise with arms locked | [Meenakshi, Gautam, Shruti]
Summary:
- We initially aligned the arm |
|
15213
|
Fri Feb 14 14:02:13 2020 |
shruti | Update | ALS | ALS OOL noise with arms locked | [Meenakshi, Shruti]
Even though we were not able to
lock the the IR beat (by enabling LSC) during |
  |
15214
|
Fri Feb 14 14:52:41 2020 |
gautam | Update | ALS | ALS OOL noise with arms locked | Unlikely, the alignment was probably just
not good. I restored the alignment and now
the arms can be locked to IR frequency. |
|
15216
|
Tue Feb 18 18:14:59 2020 |
shruti | Update | ALS | ALS OOL noise with arms locked | We proceeded with the trying to measure
the ALS out-of-loop noise of the X arm when
the X arm cavity is green-locked using different |
|
15217
|
Wed Feb 19 22:20:22 2020 |
rana | Update | ALS | ALS OOL noise with arms locked | Could you please put physical units on
the Y-axis and also put labels in the legend
which give a physical description of what |
|
16161
|
Tue May 25 17:42:11 2021 |
Anchal, Paco | Summary | ALS | ALS Single Arm Noise Budget | Here is our first attempt at a single-arm
noise budget for ALS.
Attachment 1 shows |
 |
16164
|
Thu May 27 11:03:15 2021 |
Anchal, Paco | Summary | ALS | ALS Single Arm Noise Budget | Here's an updated X ARM ALS noise budget.
Things to remember:
Major
mistake we were making earlier was that we |
 |
11891
|
Thu Dec 17 16:44:03 2015 |
gautam | Update | CDS | ALS Slow control MEDM screen updated |
|
|
9721
|
Tue Mar 11 19:38:26 2014 |
manasa | Update | Green Locking | ALS Slow servo settings |
|
|
9727
|
Fri Mar 14 10:31:10 2014 |
jamie | Update | Green Locking | ALS Slow servo settings |
|
|
9624
|
Tue Feb 11 21:22:02 2014 |
manasa | Update | Green Locking | ALS X and Y arm restored | The X and
Y arms were locked successfully using ALS |
|
9625
|
Tue Feb 11 22:17:06 2014 |
Koji | Update | Green Locking | ALS X and Y arm restored | Nice restoration. We eventually want to
make transition of the servo part from ALS
to LSC model for the further handing off |
|
9887
|
Thu May 1 00:13:21 2014 |
Koji | Update | LSC | ALS X beat setup aligned | I saw big misalignment on the GTRX camera,
I went to the PSL table and aligned the beat
beams. |
|
9983
|
Wed May 21 13:20:34 2014 |
manasa | Update | LSC | ALS X noise from angular motion of mirrors |
|
|
9988
|
Thu May 22 00:30:40 2014 |
manasa | Update | LSC | ALS X noise from angular motion of mirrors | Below are the transfer functions measured
between the angular (pit, yaw) motion of
X arm mirrors and the ALSX error signal. |
   |
9972
|
Tue May 20 02:12:35 2014 |
Jenne | Update | LSC | ALS X noise investigation | [Rana, Jenne]
We
have looked at a few things that do and don't |
 |
9880
|
Wed Apr 30 16:07:59 2014 |
manasa | Update | LSC | ALS X noise post servo modification | I. The Y arm stayed stable through last
night and I have saved the arm lock settings
to IFOconfigure. |
   |
6318
|
Fri Feb 24 19:25:43 2012 |
jamie | Update | LSC | ALS X-arm beatbox added, DAQ channels wiring normalized | I have hooked the ALS beatbox into the
c1ioo DAQ. In the process, I did some
rewiring so that the channel mapping corresponds |
|
9904
|
Fri May 2 13:03:30 2014 |
Jenne | Update | LSC | ALS Y beat setup aligned | I touched up the alignment of the Ygreen
on the PSL table. |
|
9905
|
Fri May 2 14:31:26 2014 |
Koji | Update | LSC | ALS Y beat setup aligned | Please check the X&Y ALS out-of-loop
stability. Use fine resolution (BW0.01).
Calibrate the POX/POY in Hz. |
|
8865
|
Wed Jul 17 22:51:50 2013 |
Koji | Update | Green Locking | ALS Y performance with the new whitening filter | [Manasa Koji]
Summary:
The new whitening filters improved |
 |
8866
|
Thu Jul 18 01:10:00 2013 |
kiwamu | Update | Green Locking | ALS Y performance with the new whitening filter |
|
|
8878
|
Fri Jul 19 12:00:12 2013 |
manasa | Update | Green Locking | ALS Y performance with the new whitening filter |
|
|
8864
|
Wed Jul 17 22:49:37 2013 |
Koji | Update | Green Locking | ALS Y whitening filter change | [Koji Annalisa]
We did the same mod of the beatbox
for the Y arm too. See |
|
10331
|
Mon Aug 4 22:52:03 2014 |
Jenne | Update | LSC | ALS alignment tweak-up | After aligning the arms to IR, I aligned
the Y green beam to the arm. Also,
the X green beatnote was very small, so I |
|
9219
|
Tue Oct 8 00:21:01 2013 |
manasa | HowTo | Green Locking | ALS arm stabilization | Step by
step procedure for stabilizing arms using
ALS servo |
|
9178
|
Mon Sep 30 23:56:19 2013 |
manasa | Update | Green Locking | ALS autolocker flowchart | [Masayuki, Manasa]
Flowchart for ALS autolocker. The
error signal thresholds will be decided by |
|
9179
|
Tue Oct 1 09:51:10 2013 |
rana | Update | Green Locking | ALS autolocker flowchart | I think we can use the IMC
autolocker to start with getting this started.
Once Jamie fixes the NDSSERVER environment |
|
6074
|
Tue Dec 6 00:26:00 2011 |
kiwamu | Update | LSC | ALS became robust : UGF = 100 Hz | Eventually
the instability in the Y end PDH servo turned
out to be some kind of an alignment issue. |
|
14468
|
Wed Feb 20 23:55:51 2019 |
gautam | Update | ALS | ALS delay line electronics | Summary:
Last year, I worked
on the ALS delay line electronics, thinking |
|
14475
|
Thu Mar 7 01:06:38 2019 |
gautam | Update | ALS | ALS delay line electronics | Summary:
The restoration of the delay-line
electronics is complete. The chassis has |
|
14477
|
Tue Mar 12 22:51:25 2019 |
gautam | Update | ALS | ALS delay line electronics | This
Hanford alog may be of relevance as we
are using the aLIGO AA chassis for the IR |
|
14478
|
Wed Mar 13 01:27:30 2019 |
gautam | Update | ALS | ALS delay line electronics | This test was done, and I determine the
frequency discriminant to be |
 |
14479
|
Thu Mar 14 23:26:47 2019 |
Anjali | Update | ALS | ALS delay line electronics | Attachment #1 shows the schematic of the
test setup. Signal generator (Marconi) was
used to supply the RF input. We observed |
|
9204
|
Fri Oct 4 20:25:12 2013 |
Masayuki | Update | Green Locking | ALS down script | I wrote the down script for ALS. This script
is
(script)/ALS/ALSdown.py When |
|
9226
|
Wed Oct 9 18:45:17 2013 |
Masayuki | Update | Green Locking | ALS down script modified |
|
|
13594
|
Wed Jan 31 16:33:53 2018 |
gautam | Update | ALS | ALS electronics at LSC rack | [steve,
gautam]
We installed some |
|