ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
3182
|
Thu Jul 8 19:43:16 2010 |
nancy | Update | IOO | WFS calculations | The WFS error signals were recorded in
the order
WFS1_PIT |
|
3184
|
Thu Jul 8 21:44:43 2010 |
nancy | Update | IOO | WFS calculations |
I just found the singular values
and the condition number of the 4*4 matrix |
|
7444
|
Wed Sep 26 23:55:14 2012 |
Jenne | Update | IOO | WFS centered | Since the MC spots are good, I put the
beam back on WFS 1 and WFS 2.
Also, I changed the indicators on |
|
1358
|
Thu Mar 5 00:06:32 2009 |
Kakeru, Rana | Update | IOO | WFS centering | We found that the MC REFL image was no longer
round and that the MCWFS DC quadrant spots
were mostly
|
|
1391
|
Wed Mar 11 23:41:33 2009 |
Kakeru, Yoichi | Update | IOO | WFS centering | We found the MC reflection was distorted
. And WFC beam went to upward of QPD
We recentered WFC beam and these |
|
15450
|
Sun Jul 5 18:25:42 2020 |
rana | Update | Electronics | WFS characterization | in the lab, checkin on the WFS
Sun Jul 5 18:25:50 2020
I redid Gautam's measurements |
|
15547
|
Sat Aug 29 20:07:48 2020 |
rana | Update | Electronics | WFS characterization | I set up to do the WFS head modifications
today, but I was shot down in flames due
to a missing AC/DC adapter. |
|
15548
|
Sat Aug 29 22:10:09 2020 |
gautam | Update | Electronics | WFS characterization | Clearly this "riff raff" is referring
to me. It won't help today I guess but
there is one each on the carts holding the |
|
15472
|
Sun Jul 12 22:40:35 2020 |
gautam | Update | Electronics | WFS characterization - old SURF report | After some hunting, I found this
old SURF report with the WFS head measurements.
The y-axes don't make much sense to me, |
|
8724
|
Wed Jun 19 15:07:20 2013 |
rana | Update | IOO | WFS debugging | Trying to figure out what's wrong with
the MC WFS:
1) The symptom seems to be that the |
|
8733
|
Thu Jun 20 15:15:39 2013 |
rana | Update | IOO | WFS debugging | Tried a bunch of stuff, but eventually
just turned off the TRANS_QPD loops and loops
are stable. Needs more debugging. |
|
8815
|
Tue Jul 9 20:09:53 2013 |
Koji | Update | IOO | WFS debugging | The low UGFs of the MC WFS servos made
the MC insane thesedays:
The servos are too slow and we kept |
|
9210
|
Sun Oct 6 23:43:07 2013 |
rana | Update | IOO | WFS debugging |
|
|
8735
|
Thu Jun 20 20:46:16 2013 |
gautam | Update | IOO | WFS debugging-QPD debugging |
I wanted to make sure that
the QPD map on the C1IOO_MC_TRANS_QPD.adl |
|
17391
|
Tue Jan 10 20:24:29 2023 |
Anchal | Update | ASC | WFS demodulation board 111B - Working as expected | I've completed the modifications on
two WFS demod boards. This required replacing
all 8 mixer ICs on each board. I also tuned |
|
17393
|
Wed Jan 11 17:05:55 2023 |
Anchal | Update | ASC | WFS demodulation board 112B - Working as expected | The other modified board 112B has been
fixed and tested now. See the results attached.
The issue was in some malfunctioning OP284 |
|
17365
|
Sat Dec 17 16:56:19 2022 |
Anchal | Update | ASC | WFS demodulation board modification - further study | I played with the PLL bit more today to
understand the issue. From what I understand,
the following is the summary: |
 |
17368
|
Tue Dec 20 23:32:58 2022 |
rana | Update | ASC | WFS demodulation board modification - further study | That's great - I think this solution
will be best. Having the PLLs actually gives
us some problems - the square wave action |
|
17348
|
Thu Dec 8 20:40:14 2022 |
Anchal | Update | ASC | WFS demodulation board modification attempt | Based on the previous two elog posts, Koji
and I decided that we should use 11 MHz signal
for arm cavity ASC and modify a spare WFS |
 |
17363
|
Fri Dec 16 21:55:54 2022 |
Anchal | Update | ASC | WFS demodulation board modification attempt 2 - sort of working | [Koji, Anchal]
short version: We checked signals
at different points in the circuit to make |
|
6660
|
Tue May 22 13:06:11 2012 |
Jenne | Update | IOO | WFS didn't turn off automatically | I just sat down in the control room, and
discovered the PMC (and everything else)
unlocked. I relocked the PMC, but the |
|
6669
|
Wed May 23 21:32:15 2012 |
Suresh | Update | IOO | WFS didn't turn off automatically |
|
|
5688
|
Tue Oct 18 21:19:18 2011 |
rana | Configuration | IOO | WFS disabled in SUS | I found that the MC WFS had large offset
control signals going to the MC SUS. Even
though the input switch was off, the integrators |
|
14858
|
Thu Sep 5 18:42:19 2019 |
aaron | HowTo | CDS | WFS discussion, restarting CDS | [aaron, rana]
While going to take some transfer
functions of the MC WFS loop, LSC was down. |
|
14859
|
Thu Sep 5 20:30:43 2019 |
rana | HowTo | CDS | WFS discussion, restarting CDS | via Polish chat, GV tells us to RTFE |
|
14860
|
Fri Sep 6 09:40:56 2019 |
aaron | HowTo | CDS | WFS discussion, restarting CDS | As suggested, I ran the script cds/rebootC1LSC.sh
I got a timeout error when the
script tried closing the PSL shutter ('C1:AUX-PSL_ShutterRqst' |
|
14861
|
Fri Sep 6 11:56:44 2019 |
aaron | HowTo | CDS | WFS discussion, restarting CDS | Rebooting
I reset c1lsc, c1sus,
and c1ioo.
I noticed that the script gives |
|
14862
|
Fri Sep 6 15:12:49 2019 |
Koji | HowTo | CDS | WFS discussion, restarting CDS | Assuming you are at pianosa, /etc/resolv.conf
is like
# |
|
6992
|
Thu Jul 19 02:32:45 2012 |
Jenne | Update | IOO | WFS don't come on automatically?? | The MC unlocked ~20 min ago, correlated
with 2 consecutive earthquakes in Mexico.
The MC came back fine after a few minutes, |
|
12897
|
Tue Mar 21 21:21:58 2017 |
gautam | Update | IOO | WFS filter banks updated | The arrangement of filters in the WFS loop
filter banks have been altered, Rana will
update with details of the motivation behind |
|
15741
|
Sat Dec 19 20:24:25 2020 |
gautam | Update | Electronics | WFS hardware install | I installed 4 chassis in the rack 1X2 (characterization
on the E-bench was deemed satisfactory, I
will upload the analysis later). I ran out |
|
14945
|
Mon Oct 7 14:51:20 2019 |
aaron | Update | Electronics | WFS head RF measurements | Mon Oct 7 14:51:53 2019. I closed the PSL
shutter to measure the WFS head responsivity.
I made a thru calibration as in |
|
14951
|
Tue Oct 8 16:00:06 2019 |
aaron | Update | Electronics | WFS head RF measurements | I simulated this
circuit with zero, but haven't gotten
the results to match the measurements above. |
 |
14959
|
Wed Oct 9 12:15:05 2019 |
rana | Update | Electronics | WFS head RF measurements | It would be good if you and Shruti can
look at how to change the parameters in Zero
so as to do a fit to the measured data. Usually, |
|
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 |
    |
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 |
|
17048
|
Fri Jul 29 22:37:54 2022 |
Koji | Update | IOO | WFS investigation | I wanted to check what's wrong with
the WFS.
I played with MC2 misalignment |
 |
17053
|
Tue Aug 2 01:10:26 2022 |
Koji | Update | IOO | WFS investigation | Continued to work on the WFS repair
Demod phase adjustment:
- Use the PDH signal to |
   |
17059
|
Thu Aug 4 21:58:18 2022 |
Koji | Update | IOO | WFS investigation | OK... It seems that all the 6 dof of the
IMC WFS servo loops were closed with some
condition... |
   |
17060
|
Thu Aug 4 22:14:20 2022 |
Koji | Update | IOO | WFS investigation | Sensing matrix measurement
MCx_ASCyyy_EXC was shaken with
the amplitude of 3000 cnt. Measure the transfer |
   |
17061
|
Thu Aug 4 22:14:38 2022 |
Koji | Update | IOO | WFS investigation | WFS/MCTRANS_QPD Power Spectra
Attachment 1: HEPA ON
WFS1/2 PIT/YAW Spectra are stabilized |
 |
16943
|
Fri Jun 24 12:13:16 2022 |
JC | Update | IOO | WFS issues | [Yuta, JC]
It seems that early this morning
MC got very misaligned. Yuta was able to |
|
16946
|
Sat Jun 25 14:29:48 2022 |
Anchal | Update | IOO | WFS issues | This issue is very weird and still unresolved.
Without WFS loops, we'll have to realign
IMC often and we might loose IMC alignment |
|
16947
|
Sat Jun 25 20:23:59 2022 |
Koji | Update | IOO | WFS issues | I could run the WFS servo (6dofs) for more
than 15min by flipping the sign for the MC2
Pit and WFS1 Yaw. (See attachments) |
 |
16949
|
Mon Jun 27 12:32:45 2022 |
yuta | Update | IOO | WFS issues fixed | |
|
16835
|
Fri May 6 13:48:34 2022 |
Anchal | Update | BHD | WFS loop instability fixed | [Yuta, Anchal]
We investigated why WFS loop wasn't
working. It seemed like WFS1 PIT error signal |
|
14876
|
Fri Sep 13 10:53:40 2019 |
aaron | Update | IOO | WFS loop measurements | I'm scripting the WFS sensing matrix
measurements. I haven't really scripted
DTT before, so I'm trying to find documentation |
|
14878
|
Mon Sep 16 05:08:04 2019 |
rana | Update | IOO | WFS loop measurements | not need to use DTT. I'm attaching
some half-finished notebooks that give the
gist. |
 |
14880
|
Mon Sep 16 11:55:58 2019 |
rika | Update | IOO | WFS loop measurements | [rika, aaron]
We aligned optics of WFS as it
was. Now auto-locker is working to lock MC. |
|