| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
10648
|
Tue Oct 28 20:47:08 2014 |
diego | Update | IOO | IMC WFS sensing matrix measurement | Today I started looking into the WFS problem
and improvement, after being briefed by Koji
and Nicholas. I started taking some measurements |
6x |
|
10653
|
Thu Oct 30 02:12:59 2014 |
diego | Update | IOO | IMC WFS sensing matrix measurement | [Diego,Koji]
Today we took some measurements of
transfer functions and power spectra of suspensions |
12x |
|
10681
|
Thu Nov 6 12:58:28 2014 |
Koji | Update | IOO | WFS offset was reset | IMC WFS operating point seemed to get degraded.
- IMC WFS feedback was relieved.
- WFS servo was turned off. |
|
|
10704
|
Wed Nov 12 20:11:41 2014 |
Koji | Update | IOO | MC WFS gain reduced again | MC WFS was oscillative at 1Hz. I've reduced
the servo gain further (x1, x1, x10, x1,
x1, and x10). |
|
|
10706
|
Wed Nov 12 22:22:11 2014 |
Koji | Summary | IOO | Estimation of the angular jitter imposed by the TTs | [Koji, Rana, Jenne]
One coil of the TT produce 36nrad/rtHz
at DC. |
|
|
10722
|
Mon Nov 17 20:28:17 2014 |
rana | Summary | IOO | MC servo summing amp | I modified the /cvs/cds/caltech/target/c1psl/psl.db
file to adjust the records for the FSS-FAST
signal (to make it go yellow / red at the |
|
|
10723
|
Mon Nov 17 20:40:29 2014 |
rana, diego | Update | IOO | Investigating the IMC WFS situation | We've known for years that the IMC WFS
sensing chain is pointlessly bad, but until
recently, we haven't thought it was worth |
|
|
10728
|
Thu Nov 20 22:43:15 2014 |
Koji | Update | IOO | IMC WFS damping gain adjustment | From the measured OLTF, the dynamics of
the damped suspension was inferred by calculating
H_damped = H_pend / (1+OLTF). |
|
|
10826
|
Sun Dec 21 18:46:06 2014 |
diego | Update | IOO | MC Error Spectra | The error spectra I took so far are not
that informative, I'm afraid. The first three
posted here refer to Wed 17 in the afternoon, |
|
|
10828
|
Mon Dec 22 15:11:08 2014 |
rana | Update | IOO | MC Error Spectra | che tristezza
What we want is to have the high |
|
|
10829
|
Mon Dec 22 15:46:58 2014 |
Kurosawa | Summary | IOO | Seven transfer functions | IMC OL TF has been measured from 10K to
10M |
|
|
10832
|
Mon Dec 22 21:53:08 2014 |
rana, koji | Update | IOO | Seven transfer functions | Today we were looking at the MC TFs and
pulled out the FSS box to measure it. We
took photos and removed a capacitor with |
|
|
10833
|
Tue Dec 23 01:55:35 2014 |
rana, koji | Update | IOO | Seven transfer functions | Some TFs of the TTFSS box |
|
|
10841
|
Tue Dec 23 20:50:39 2014 |
rana, koji | Update | IOO | Seven transfer functions | Today we decided to continue to modify
the TTFSS board.
The modified schematic can be found |
|
|
10842
|
Wed Dec 24 08:25:05 2014 |
rana | Configuration | IOO | notes on MC locking | I've updated the scripts for the
MC auto locking. Due to some permissions
issues or general SVN messiness, most of |
|
|
10847
|
Tue Dec 30 00:46:05 2014 |
rana | Update | IOO | Investigations into the mad PCDRIVE | Koji and I noticed that there was a comb*
of peaks in the MC and FSS at harmonics of
~37 kHz. Today I saw that this shows up (at |
|
|
10851
|
Sun Jan 4 22:08:46 2015 |
rana | Update | IOO | MC loop characterizations: PZT/EOM crossover | * PMC + MC were unlocked when I came
in.
* I fiddled around some more with |
|
|
10855
|
Mon Jan 5 23:36:47 2015 |
ericq | Update | IOO | AO cable reconnected |
|
|
|
10858
|
Tue Jan 6 10:04:39 2015 |
Steve | Update | IOO | happy IOO | |
|
|
10928
|
Thu Jan 22 02:56:07 2015 |
ericq | Update | IOO | FSS input offset adjusted | Since Rana's overhaul of the IMC, the
FSS input offset had been sitting at zero.
Over the last day or so, I had |
|
|
10931
|
Thu Jan 22 18:36:11 2015 |
diego | Update | IOO | MC Flashes | I've been looking into the data of
Jan 06 and Jan 15 taken during daytime, as
the night before we left the PRC aligned |
|
|
10940
|
Mon Jan 26 17:43:52 2015 |
ericq | Configuration | IOO | MC Autolocker update | The MC autolocker hasn't been
so snappy recently, and has been especially fussy
today. Previously, the mcup script was triggered |
|
|
10951
|
Wed Jan 28 17:39:17 2015 |
Koji | Configuration | IOO | X Trans Table less crazy but not enough yet | The X-end IR Trans path was cleaned
up.
I have been investigating the Xarm |
|
|
10958
|
Thu Jan 29 17:20:58 2015 |
manasa | Configuration | IOO | X Trans Table less crazy but not enough yet | [Koji, Manasa]
We cleared up some optics
and optomechanics at the X end table that |
|
|
11018
|
Thu Feb 12 23:40:12 2015 |
rana | Update | IOO | Bounce / Roll stopband filters added to MC ASC filter banks | |
|
|
11094
|
Tue Mar 3 19:19:15 2015 |
ericq | Update | IOO | PC Drive / FSS Slow correlation | Jenne and I were musing the other night
that the PC drive RMS may have a "favorite"
laser temperature, as controlled by the FSS |
|
|
11106
|
Fri Mar 6 00:59:13 2015 |
rana | Summary | IOO | MC alignment not drifting; PSL beam is drifting | In the attached plot you can see that the
MC REFL fluctuations started getting larger
on Feb 24 just after midnight. Its been bad |
|
|
11109
|
Fri Mar 6 13:48:17 2015 |
dark kiwamu | Summary | IOO | triple resonance circuit | I was asked by Koji to point out where
a
schematic of the triple resonant circuit |
|
|
11112
|
Fri Mar 6 19:54:15 2015 |
rana | Summary | IOO | MC alignment not drifting; PSL beam is drifting | MC Refl
alignment follow up: the alignment from last |
|
|
11145
|
Thu Mar 19 14:37:17 2015 |
manasa | Configuration | IOO | IMC relocked | The autolocker was struggling to lock the
IMC. I disabled the autolocker and locked the
IMC manually. It seems happy right now. |
|
|
11147
|
Thu Mar 19 16:58:19 2015 |
Steve | Summary | IOO | MC alignment not drifting; PSL beam is drifting | Polaris mounts ordered.
|
|
|
11149
|
Fri Mar 20 10:51:09 2015 |
Steve | Summary | IOO | MC alignment not drifting; PSL beam is drifting | Are the two visible small srews holding
the adapter plate only?
If yes, it is the weakest point |
|
|
11150
|
Fri Mar 20 12:42:01 2015 |
Jenne | Update | IOO | Waking up the IFO | I've done a few things to start waking
up the IFO after it's week of conference-vacation.
PMC trans was at 0.679, aligned |
|
|
11151
|
Fri Mar 20 13:29:33 2015 |
Koji | Update | IOO | Waking up the IFO | If the optics moved such amount, could
you check the PD alignment once the optics
are aligned? |
|
|
11152
|
Fri Mar 20 16:44:49 2015 |
ericq | Update | IOO | Waking up the IFO | X arm ASS is having some issues. ITMX
oplev was recentered with ITMX in a good
hand-aligned state. |
|
|
11158
|
Mon Mar 23 09:42:29 2015 |
Steve | Summary | IOO | 4" PSL beam path posts | To achive the same beam height each components
needs their specific post height.
|
|
|
11175
|
Thu Mar 26 10:41:06 2015 |
Steve | Update | IOO | The PMC is not clamped | The PMC is seated on 3 SS balls and it
is free to move. I'm sure it will move
in an earthquake. Not much, because the input |
|
|
11216
|
Mon Apr 13 19:34:02 2015 |
ericq | Update | IOO | Modulation Frequency Tuned to IMC Length | I've been fiddling with the mode cleaner
and green beat box today, to try and get
an absolute frequency calibration for MC2 |
|
|
11332
|
Thu May 28 17:00:04 2015 |
Koji | Update | IOO | FSS SLOW not engaged: is this intentional? | I found that FSS SLOW servo is not engaged.
Is this intentional test to keep the NPRO
temp constant? |
|
|
11333
|
Thu May 28 17:12:32 2015 |
ericq | Update | IOO | FSS SLOW not engaged: is this intentional? | Yes, I had turned it off while looking
for the PSL/X AUX beat, and forgot to turn
it back on. |
|
|
11343
|
Tue Jun 2 21:22:07 2015 |
rana, koji | Configuration | IOO | AOM inserted in beam and aligned | We
spent an hour today to put the AOM back in |
|
|
11360
|
Mon Jun 15 20:36:48 2015 |
rana | Update | IOO | IOO QPDs centred | after re-aligning the beam into the PMC,
I touched up the steering mirros into the
IOO QPDs so that the beams are now centered |
|
|
11447
|
Mon Jul 27 16:47:53 2015 |
ericq | Update | IOO | MC2 -> MCL Actuator TF | Our noise cancellation SURFS will be doing
online subtraction on the mode cleaner length,
among other things. |
|
|
11453
|
Tue Jul 28 15:06:27 2015 |
Steve | Update | IOO | PSL HEPA turned on | |
|
|
11462
|
Thu Jul 30 02:06:20 2015 |
Ignacio | Update | IOO | MC2 <-> MCL Actuator TF fitted | Eric downloaded MC2 to MCL transfer function
data (H) as well as its inverse, MCL to MC2
(Hinv). He also downloaded new MCL and MC2 |
|
|
11472
|
Thu Jul 30 19:12:52 2015 |
Ignacio | Update | IOO | YAW and PIT WFS Wiener filtering | Rana pointed out that another way to mitigate
seismic motion at in the mode cleaner would
be to look at the YAW and PITCH output channels |
|
|
11488
|
Mon Aug 10 22:18:19 2015 |
Ignacio | Update | IOO | Ready to do some online mode cleaner subtraction | I'm attaching a SISO IIR Wiener filter
here for reference purposes that will go
online either tonight or tomorrow evening. |
|
|
11492
|
Tue Aug 11 11:30:19 2015 |
Ignacio | Update | IOO | SISO (T240-X) FF of MCL | Last night we finally got some online subtraction
going. The filter used is described in the
post this eLOG is @eLOG |
|
|
11495
|
Tue Aug 11 18:43:42 2015 |
Jessica | Update | IOO | MCL Online Subtraction | Today I finished fitting the transfer function
to a vectfit model for seismometers T240_X
and T240_Y, and then used these to filter |
|
|
11496
|
Wed Aug 12 01:32:18 2015 |
Ignacio | Update | IOO | Improved SISO (T240-X) FF of MCL | In my previous elog:11492,
I stated that in order to improve the subtraction |
|