| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
9773
|
Tue Apr 1 22:03:44 2014 |
Koji | Summary | ASC | New PRM ASC is running | [Koji Jenne]
New PRM ASC was implemented. [to
be cnt'd] |
|
|
9777
|
Wed Apr 2 19:50:12 2014 |
Koji | Summary | ASC | New PRM ASC is running | As the designed ASC filters in this
entry had too little phase margins (~10deg),
I had to compromise the servo design. |
|
|
9779
|
Wed Apr 2 23:08:51 2014 |
Koji | Summary | ASC | New PRM ASC is running | The new PRM ASC design
Pitch
FM1: zero at 0Hz, pole at 2000Hz, |
|
|
9930
|
Thu May 8 14:37:02 2014 |
Jenne | Update | ASC | POP ASC QPD power | I was thinking about POP today, and wanted
to know if there was something to be done
to allow us to use the PRCL ASC for at least |
|
|
10114
|
Mon Jun 30 22:06:55 2014 |
Jenne | Update | ASC | IFO (mostly) aligned - ASS working | [Koji, Jenne]
The Yarm ASS is now working (as is
the Xarm ASS). Both of the TT's pitch |
|
|
10124
|
Wed Jul 2 16:18:32 2014 |
Jenne | Update | ASC | IFO aligned, PRMI + 2 arms achieved | After the meeting, I aligned the IFO to
the IR, and then I aligned the Ygreen to
the Yarm. I then found the beatnotes |
|
|
10278
|
Sat Jul 26 14:45:33 2014 |
Gabriele | Metaphysics | ASC | Response of POP QPD | Koji asked me to perform a simulation
of the response of POP QPD DC signal to mirror
motions, as a function of the CARM offset. |
|
|
10337
|
Wed Aug 6 10:45:56 2014 |
Gabriele | Update | ASC | POP QPD signals | In addition to the simulation described
in my
previous elog, I simulated the signal |
|
|
10338
|
Wed Aug 6 12:44:52 2014 |
Koji | Update | ASC | POP QPD signals | This is nice. Can we test this idea with
POP22 + a razor blade?
Just to take transfer functions in |
|
|
10398
|
Fri Aug 15 01:31:44 2014 |
Jenne | Update | ASC | POP QPD to ETMs model wiring complete | I have added a few things to the ASS model,
and the ASC sub-block, so that we can send
POP QPD information down to the ETMs for |
|
|
10454
|
Thu Sep 4 18:30:13 2014 |
Gabriele | Summary | ASC | Optimal Gouy phase for POP QPD | Jenne asked me to simulate the signals
on POP QPD when moving different mirrors,
as a function of the Gouy phase where the |
|
|
10503
|
Fri Sep 12 15:10:09 2014 |
Jenne | Update | ASC | MICH ASS | During the Sim meeting today, I added parts
to the ASS model so that we can also dither
the BS and minimize the power at AS. |
|
|
10662
|
Mon Nov 3 17:14:00 2014 |
ericq | Update | ASC | IMC to IFO angular motion | Something to note, as we have the IMC angular
controls under consideration:
Jenne has the DRMI locked right now. |
|
|
10663
|
Mon Nov 3 17:43:14 2014 |
Koji | Update | ASC | IMC to IFO angular motion | I wonder if this is the coherence caused
by the beam itself, or caused by the same
ground motion. |
|
|
10680
|
Thu Nov 6 12:53:09 2014 |
diego | Update | ASC | X arm restored | [Diego, Koji]
X arm has been restored, after modifying
the two parameters mentioned in http://nodus.ligo.caltech.edu:8080/40m/10676 |
|
|
10745
|
Tue Dec 2 01:27:22 2014 |
diego | Update | ASC | ASS Scripts for arms | I updated the medm C1ASS page for the Arm
scripts:
ON : same as before |
|
|
10752
|
Thu Dec 4 00:26:07 2014 |
Jenne | Update | ASC | POP yaw razor blade installed | We would like the option of feeding
back the POP beam position fluctuations to
the PRM to help stabilize the PRC since we |
|
|
10768
|
Tue Dec 9 03:34:52 2014 |
Jenne | Update | ASC | POP yaw razor tuning | With the re-do of the IFO alignment last
week, I think that the beam was no longer
about halfway on the POP22 razor blade. |
|
|
10789
|
Fri Dec 12 04:33:49 2014 |
Jenne | Update | ASC | ASS retuned | [Rana, Jenne]
We decided that tonight was the night
for ASS tuning. |
|
|
10807
|
Wed Dec 17 01:51:44 2014 |
rana, jenne | Update | ASC | ASS retuned | Did a big reconfig to make the Y-arm work
again since it was bad again.
Undid Koji's topology |
|
|
10811
|
Wed Dec 17 18:14:36 2014 |
ericq | Update | ASC | Transmon QPD -> ASC servos ready for comissioning | I have completed all of the model
modifications and medm screen updates to
allow for feedback from the transmon QPD |
|
|
10812
|
Wed Dec 17 19:04:12 2014 |
jenne | Update | ASC | ASS retuned | I made the Xarm follow the new (old) topology
of Length -> test masses, and Trans ->
input pointing. |
|
|
10813
|
Wed Dec 17 19:31:55 2014 |
Koji | Update | ASC | ASS retuned | I wonder what to do with the X arm.
The primary purpose of the
ASS is to align the arm (=transmission), |
|
|
10886
|
Mon Jan 12 18:11:25 2015 |
ericq | Update | ASC | Test Mass -> Transmon QPD TFs measured | We want to have some angular control of
the arms during lock acquistion.
In single arm lock, Diego |
|
|
10908
|
Thu Jan 15 18:57:41 2015 |
ericq | Update | ASC | Transmon QPD loops live | I've measured the sensing for each
of the arms, by using our calibrated oplevs,
in terms of QPD counts per micron. It is: |
|
|
10920
|
Mon Jan 19 18:27:16 2015 |
ericq | Update | ASC | QPD ASC saga continues. | Herein,
I will try
to paint a more thorough picture of this |
|
|
10921
|
Tue Jan 20 02:39:49 2015 |
ericq | Update | ASC | QPD ASC saga continues. | Although the QPD loops are less than
ideal right now, I made changes to the ASC
model to trigger the QPD loops on and off |
|
|
10946
|
Tue Jan 27 21:33:39 2015 |
Koji | Update | ASC | ASS retuned | I checked the situation of ASS. I wanted
to know how much we are away from the maximum
transmittion. |
|
|
10952
|
Wed Jan 28 23:53:24 2015 |
Koji | Summary | ASC | Xarm ASS fix | X-Arm
ASS was fixed.
ASS_DITHER_ON.snap was updated so |
|
|
10963
|
Mon Feb 2 12:24:27 2015 |
Jenne | Update | ASC | POP QPD centered | After aligning the PRC, I centered the
POP QPD. |
|
|
10974
|
Wed Feb 4 18:27:55 2015 |
Koji | Summary | ASC | Xarm ASS fix | Please remember
that Xarm ASS needs FM6 (Bounce filters) |
|
|
10975
|
Wed Feb 4 19:21:37 2015 |
Koji | Update | ASC | Arm ASS servos now have triggered gain with arm lock status | We had persistent frustration by occasional
unlock during ASSing.
Today, I added triggers to the servo |
|
|
10997
|
Tue Feb 10 18:37:17 2015 |
ericq | Update | ASC | QPD ASC ready to go | I've remeasured the QPD ASC sensing
coefficients, and figured out what I did
weird with the actuation coefficients. I've |
|
|
11056
|
Fri Feb 20 19:09:48 2015 |
ericq | Update | ASC | QPD frontend code unified | I have changed all of the oplevs and transmon
QPDs to use the common ISC QPD library block,
which differs mainly in its divide by zero |
|
|
11057
|
Mon Feb 23 08:06:59 2015 |
rana | Update | ASC | QPD frontend code unified | Might have to also get the OL screens that
go with this new code to see, but the calibrations
don't go into the matrix, but rather |
|
|
11061
|
Tue Feb 24 18:54:26 2015 |
ericq | Update | ASC | Single arm QPD ASC stability | I've lowered the UGFs for the transmission
QPD servos to ~1-2Hz, and made it just an
integrator. I left the arms locked with the |
|
|
11125
|
Mon Mar 9 18:10:59 2015 |
Jenne | Update | ASC | Oplev filters re-copied | Back on Feb 20th (elog
11056) Q replaced all of our oplev parts
with the aLIGO version. |
|
|
11206
|
Tue Apr 7 04:21:45 2015 |
ericq | Update | ASC | Angular Control during Locking | [J, Q]
Alignment is making it tough for
locks to last more than 10 minutes. Many |
|
|
11242
|
Fri Apr 24 01:16:30 2015 |
Jenne | Update | ASC | Broken Xass? | I ran the "off" script for the
Xarm ASS, followed by the "on"
script, and now the Xarm ASS doesn't |
|
|
11248
|
Sat Apr 25 03:32:45 2015 |
Koji | Update | ASC | Broken Xass? | I spent a day to fix the XARM ASS, but
no real result. If the input of the 6th DOF
servo is turned off, the other error signals |
|
|
11253
|
Sun Apr 26 01:10:18 2015 |
rana | Update | ASC | unBroken Xass? | Today I tried some things, but basically,
lowering the input gain by 10 made the thing
stable. In the attached screenshotstrip, |
|
|
11255
|
Sun Apr 26 15:05:35 2015 |
Jenne | Update | ASC | unBroken Xass? | Thank you both.
I have updated the .snap file,
so that it'll use these parameters, as |
|
|
11269
|
Sun May 3 19:40:51 2015 |
rana | Update | ASC | Sunday maintenance: alignment, OL center, seismo, temp sensors | X
arm was far out in yaw, so I reran the ASS
for Y and then X. Ran OK; the offload from |
|
|
11296
|
Sun May 17 23:46:25 2015 |
rana | Update | ASC | IOO / Arm trends | Looking
at the summary
page trends from today, you can see that |
|
|
11482
|
Thu Aug 6 04:36:41 2015 |
ericq | Update | ASC | Reviving PRC angular feedforward | Tonight, I've taken a bunch of data
where the PRC is carrier locked and the ITM
oplevs have the DC coupling FM turned on, |
|
|
11489
|
Tue Aug 11 02:26:46 2015 |
ericq | Update | ASC | PRC Angular FF Lives! | PRC
Angular FF is back in action!
Short
and sweet of it: |
|
|
11562
|
Thu Sep 3 00:29:45 2015 |
rana | Update | ASC | ASS X not working | ran the ON script several times and it
kept pulling it away from good alignment,
even when TRX was > 0.9. |
|
|
11721
|
Wed Oct 28 17:06:30 2015 |
ericq | Update | ASC | New PRC Angular FF filters installed | I've installed new filters for the
T240 -> PRM static online angular feedforward
that were trained after some of the recent |
|
|
11776
|
Tue Nov 17 20:40:08 2015 |
yutaro | Summary | ASC | Loss maps of arm cavities | In preparation for the measurement of loss
maps of arm cavities, I measured the relationship
between: |
|
|
11779
|
Wed Nov 18 11:22:13 2015 |
yutaro | Update | ASC | Loss maps of arm cavities | I got linear relation between these. The
results and method are below.
|
|