ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
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 |
|
14993
|
Fri Oct 25 01:04:49 2019 |
gautam | Update | ALS | ALS electronics chain was saturating | [Koji, gautam]
Summary:
We think we got to the bottom of |
|
5888
|
Mon Nov 14 17:01:14 2011 |
kiwamu | Update | Green Locking | ALS feedback on MC2 | Leaving a note on the ALS feedback before
I forget:
The |
|
6154
|
Wed Dec 28 14:13:16 2011 |
kiwamu | Update | Green Locking | ALS feedback on MC2 | I
added an ALS feedback path on the MC2 suspension
and this path will enable us to stabilise |
|
11050
|
Thu Feb 19 04:16:45 2015 |
Jenne | Update | LSC | ALS fool attempt with PRFPMI | [Jenne, EricQ]
We tried several times tonight
to engage the Fool path with the PRFPMI. |
 |
11030
|
Sat Feb 14 20:20:24 2015 |
Jenne | Update | LSC | ALS fool cartoon | The ALS fool scheme is now diagrammed up
in OmniGraffle, including its new official
icon. The mathematica notebook has |
 |
11042
|
Tue Feb 17 04:04:32 2015 |
Jenne | Update | LSC | ALS fool math | I re-did the Mathematica notebook according
to the most current diagram (note to daytime
self: attach .nb file!!!), and found that |
 |
11043
|
Tue Feb 17 16:36:08 2015 |
Jenne | Update | LSC | ALS fool math | Here is an updated cartoon, with the ALS
sensor explicitly shown as the beatbox times
the closed loop response of the phase tracker |
 |
11037
|
Mon Feb 16 02:49:57 2015 |
Jenne | Update | LSC | ALS fool measured decoupling TF | I have measured very, very carefully the
transfer function from pushing on
MC2 to the Yarm ALS beatnote. |
 |
11038
|
Mon Feb 16 03:10:42 2015 |
Koji | Update | LSC | ALS fool measured decoupling TF | Wonkey shape: Looks like a loop supression.
Your http://nodus.ligo.caltech.edu:8080/40m/11016
also suggests it too, doesn't it? |
|
11039
|
Mon Feb 16 15:08:26 2015 |
Jenne | Update | LSC | ALS fool measured decoupling TF | Dang it, yes. You're right. I
should have caught that.
Since Dcpl and Srefl are both zero |
|
8694
|
Tue Jun 11 22:16:56 2013 |
Manasa | Summary | Green Locking | ALS for X arm | I discussed with Yuta about the ALS servo
and phase tracker and found that there was
a lot of information lying around from last |
|
9195
|
Thu Oct 3 09:01:06 2013 |
manasa | Update | Green Locking | ALS high frequency noise | As I was trying to solve the 2 arm
ALS problem, I found the Y arm ALS not so
stable AGAIN :( . I measured the in-loop |
|
10399
|
Fri Aug 15 02:05:55 2014 |
Jenne | Update | LSC | ALS in-loop spectra | Not sure why, but Rana and I didn't
see the super high Xarm noise with ALS that
we reported last night (elog |
|
10335
|
Wed Aug 6 00:14:10 2014 |
Jenne | Update | LSC | ALS is iffy tonight | The ALS system is iffy tonight.
After putting the cable back to the
RF spectrum analyzer (it had been taken to |
|
10925
|
Tue Jan 20 20:03:17 2015 |
Jenne | Update | LSC | ALS lock not staying? | The Xarm ALS has been a little funky today.
First, the green and the arm-axis
would not stay co-aligned. I'm |
|
9659
|
Wed Feb 19 22:47:26 2014 |
Jenne | Update | LSC | ALS locked using LSC model, Common & Diff transitioned to IR transmission signals | [Jenne, Koji, Manasa, EricQ]
Today
we successfully locked the ALS using the |
 |
9649
|
Tue Feb 18 23:55:33 2014 |
Jenne | Update | LSC | ALS locked with LSC! | I'm really excited, so I'm posting this,
even though I'm still working:
|
|
9650
|
Wed Feb 19 00:35:23 2014 |
Koji | Update | LSC | ALS locked with LSC! | Great. I indeed disabled all of the triggers
and the normalization during my trial but
in vain. |
|
9651
|
Wed Feb 19 01:33:03 2014 |
Jenne | Update | LSC | ALS locked with LSC! | I am also not able to lock the ALS using
the 'regular' LSC filters. To figure
out what filters were doing what, I made |
  |
9652
|
Wed Feb 19 03:07:22 2014 |
Jenne | Update | LSC | ALS locked with LSC! | No more progress tonight.
I am still unable to lock the ALS using the
regular LSC filters. I went back to |
|
8659
|
Thu May 30 18:29:21 2013 |
Manasa | Update | General | ALS medm screens edited | Renaming of the c1gcv model earlier (elog
7011) had left white boxes in most of |
|
8738
|
Mon Jun 24 16:06:17 2013 |
Manasa | Summary | Green Locking | ALS model | I am working on the basic
ALS servo model. The simulink model for the
same is attached. The loop is not yet complete |
|
9836
|
Mon Apr 21 22:53:16 2014 |
manasa | Update | LSC | ALS noise |
|
 |
10884
|
Fri Jan 9 14:13:02 2015 |
manasa | Update | General | ALS noise at ~30Hz | Before starting to move things around the
PSL table, I measured the ALS out of loop noise |
 |
15587
|
Sat Sep 19 23:59:22 2020 |
anchal | Summary | ALS | ALS noise budget update | Setting the record straight
I
found out an error I did in copying some
control model values from Kiwamu's matlab |
    |
15589
|
Sun Sep 20 23:12:13 2020 |
rana | Summary | ALS | ALS noise budget update | I think the digital loop in the ALS budget
is too optimistic. You have to include all
the digital delays and anti-aliasing filters |
|
15593
|
Tue Sep 22 00:14:43 2020 |
anchal | Summary | ALS | ALS noise budget update | This is not a reply to comments
given to the last post; Still working on
incorporating those suggestions. |
 |
15594
|
Tue Sep 22 12:14:42 2020 |
rana | Summary | ALS | ALS noise budget update | This ALS loop is not stable. Its one of
those traps that comes from using only the
Bode plot to estimate the loop stability. |
|
15601
|
Wed Sep 23 11:13:49 2020 |
anchal | Summary | ALS | ALS noise budget update | Yes, that loop was unstable. I started
using the time domain response to check for
the stability of loops now. I have been able |
 |
15626
|
Wed Oct 14 17:03:55 2020 |
anchal | Summary | ALS | ALS noise budget update - Added whitening filter for ADC | Koji recommended that I can add whitening
filters to suppress ADC noise easily. I added
a filter before ADC in ALS loop with 4 zeros |
|
15617
|
Wed Oct 7 16:56:23 2020 |
anchal | Summary | ALS | ALS noise budget update - Updated AUX PDH Loop values | AUX PDH Loop update
I
used D1400293
to get the latest logged details about the |
 |
15619
|
Thu Oct 8 11:59:52 2020 |
rana | Summary | ALS | ALS noise budget update - Updated AUX PDH Loop values | For all the loops where we drive the NPRO
PZT, there is some notch/resonance feature
due to the PZT mechanical resonance. In the |
|
15622
|
Fri Oct 9 18:32:14 2020 |
anchal | Summary | ALS | ALS noise budget update - Updated AUX PDH Loop values | The only two PZT Phase modulation transfer
function measurements I could find are 40m/15206 |
|
15233
|
Thu Feb 27 22:45:40 2020 |
gautam | Update | ALS | ALS noise high | There was some UNELOGGED work at EX today.
The DFD outputs were also hijacked for loss
measurement. Unclear |
|
15046
|
Mon Nov 25 19:11:22 2019 |
gautam | Update | LSC | ALS noise re-look | I re-checked the ALS noise in the following
configurations:
PRM is misaligned.
Michelson |
|
9832
|
Fri Apr 18 20:17:17 2014 |
Jenne | Update | LSC | ALS noisy | Last night, as well as tonight, the ALS
seems not quite as robust as it was earlier
in the week. |
 |
9646
|
Tue Feb 18 18:52:08 2014 |
Jenne | Update | LSC | ALS not locking with LSC | Koji mentioned to me (and elogged) that
he was unsuccessful locking the ALS using
the LSC servos. He suggested I look |
   |
9647
|
Tue Feb 18 20:31:29 2014 |
Koji | Update | LSC | ALS not locking with LSC | Hmm. Wierd. Can you look at the TFs between
ETMX-EXC and the error signals so that we
can identify which one has these structures. |
|
9648
|
Tue Feb 18 23:27:14 2014 |
Jenne | Update | LSC | ALS not locking with LSC | It looks like its somehow a discrepancy
between the TFs of each error signal, because
features are similar, and present, in both |
|
9694
|
Wed Mar 5 19:15:39 2014 |
Jenne | Summary | LSC | ALS offset moving script modified |
|
|
9015
|
Thu Aug 15 19:05:07 2013 |
manasa | Update | Green Locking | ALS out of loop noise | Beat notes were recovered for both the
arms.
I locked the arms to IR using PDH |
|
9906
|
Fri May 2 19:03:13 2014 |
Jenne | Update | LSC | ALS out of loop spectra | I have taken out of loop spectra for both
arms, by looking at POX/POY while the arms
were controlled with ALS. |
|
9198
|
Thu Oct 3 13:54:25 2013 |
manasa | Update | Green Locking | ALS out-of loop noise | We found the PDH servo gain for Y arm green
was set at 2 (too low). The gain was set
to 8.6 (based on earlier OLTF measurement |
|
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 |
|
11679
|
Fri Oct 9 13:31:21 2015 |
ericq | Update | LSC | ALS plant shape | To get a better look at how to do fast
ALS, I took some "Plant TF"
measurements of the X arm. |
|
11680
|
Fri Oct 9 14:50:18 2015 |
Koji | Update | LSC | ALS plant shape | ALS is the comparison of the
PSL laser freq vs the
end laser freq that is locked to the arm |
|
11681
|
Fri Oct 9 16:23:25 2015 |
ericq | Update | LSC | ALS plant shape | Ah, I understand it now! Since the additive
offset path keeps the post-cavity frequency
TF flat, the pre-cavity frequency must grow |
|