| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
10310
|
Thu Jul 31 19:37:59 2014 |
Koji | Update | IOO | Successful modification of the FSS | Quick note:
Migration
of the 10Hz pole from the output stage of |
|
|
10311
|
Thu Jul 31 21:21:49 2014 |
Koji | Frogs | elog | MicroSoft BingBot is attacking us | Oh,
this is cool! Thanks!
I could not figure out how to place |
|
|
10312
|
Thu Jul 31 21:59:25 2014 |
Koji | Bureaucracy | General | Ants | Don't leave your
food on tables and desks!
Also I put the souvenir chocolates |
|
|
10313
|
Thu Jul 31 23:19:22 2014 |
Koji | Update | Computer Scripts / Programs | SVN bulletin | Did this break "netgpibdata"?
I couldn't download data from SR785.
Downloading from AG4395A was OK. |
|
|
10314
|
Thu Jul 31 23:43:00 2014 |
Koji | Update | IOO | Modulation frequency adjustment | The main IFO modulation frequency was adjusted
to match with the FSR of the IMC.
The new frequency is 11.066128 MHz. |
|
|
10315
|
Fri Aug 1 00:51:07 2014 |
Koji | Update | PSL | FSSSlowServo update | FSS Slow set point to be zero
op340m:FSS>cat FSSSlowServo
#!/usr/bin/perl -w |
|
|
10316
|
Fri Aug 1 01:29:55 2014 |
Koji | Update | IOO | PMC issue | - PMC suddenly refused to lock.
- Investigated what's wrong
- Finally, I touched RF Output Adjust |
|
|
10317
|
Fri Aug 1 01:57:24 2014 |
Koji | Summary | IOO | MC auto locker | To make MC auto locker running correctly,
mcdown and mcup were revised
I tried it by unlocking MC several |
|
|
10318
|
Fri Aug 1 03:49:26 2014 |
Koji | Summary | General | Koji - to do | - Put the circuit diagram of the
sum amp on/in the circuit enclosure and associate
it with an elog [done]. |
|
|
10319
|
Fri Aug 1 08:55:34 2014 |
Koji | Summary | IOO | MC auto locker | It seems that the MC auto locker and the
FSSSlow PID servo survived a night.
PC Drive is still angry occasionally. |
|
|
10320
|
Fri Aug 1 10:40:48 2014 |
Koji | Summary | IOO | MC servo summing amp | The
summing amp is prepared to allow up to use
bipolar full range of the FSS box output
|
|
|
10321
|
Fri Aug 1 11:11:12 2014 |
Koji | Update | IOO | Current IMC servo configuration | The comparison between the new and old
MC servo (FSS part) was attached.
- The new servo has the same DC |
|
|
10322
|
Fri Aug 1 12:49:06 2014 |
Koji | Summary | IOO | MC servo analysis | Reasoning to choose the current parameters:
FSS Common: 18dB
FSS Fast: 20dB |
|
|
10325
|
Fri Aug 1 22:56:27 2014 |
Koji | Update | General | Beam lost in the chamber??? | I was investigating several issues on the
IFO. As many of you noticed and not elogged,
ITMX had frequent kicking without its oplev |
|
|
10327
|
Sun Aug 3 23:47:56 2014 |
Koji | Update | General | Recovery efforts | It's great that you guys found the beam.
Yes, ITMX kick and lost communication |
|
|
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 |
|
|
10341
|
Wed Aug 6 21:22:09 2014 |
Koji | Update | IOO | FSS offset changed | The fast feedback
should be around zero now! |
|
|
10343
|
Thu Aug 7 11:57:59 2014 |
Koji | Summary | IOO | MC servo analysis | LISO Fit for the IMC open loop TF. The
data and liso source for the fitting were
attached in the ZIP file. |
|
|
10356
|
Fri Aug 8 18:08:12 2014 |
Koji | Summary | IOO | MC servo analysis | The closed gain I meant is the AO path:
Use IN2 to excite the MC loop and measure
IN1 using MON2(?). |
|
|
10359
|
Sat Aug 9 14:35:28 2014 |
Koji | Summary | IOO | MC servo analysis | Eric's OLTF turned out consistent with
the AO path TF that has been measured by
me on Jul 31 (entry |
|
|
10364
|
Mon Aug 11 22:07:31 2014 |
Koji | Summary | IOO | MC demod measurement | SCLF-5!? It's surprising as the cut off
of the OLTF is just above 1Hz. cf
this entry |
|
|
10385
|
Thu Aug 14 15:42:29 2014 |
Koji | Update | General | Updated game plan | - ALS
End PDH UGF improvement / post mixer
LPF investigation (with in 2 weeks) |
|
|
10387
|
Thu Aug 14 18:02:11 2014 |
Koji | Update | General | Updated game plan | Got the idea of ASC.
- Oplevs for PR2, PR3 => PR2 seems
OK. PR3 almost impossible. well |
|
|
10406
|
Mon Aug 18 09:42:50 2014 |
Koji | Summary | IOO | MCREFL PD charcterization | Riju did the
measurement of the MCREFL PD.
I found data files in her directory |
|
|
10432
|
Wed Aug 27 09:12:47 2014 |
Koji | Update | IMC | WFS tuneup | I'm sure that the 1~3Hz motion comes from
the mirror motion, but not 100% sure what
is causing |
|
|
10442
|
Tue Sep 2 22:54:27 2014 |
Koji | Summary | LSC | phase tracker UGF | FYI and FMI
Phase tracker UGF is Q_AMP
* G * 2 PI / 360 where Q_AMP is |
|
|
10451
|
Thu Sep 4 10:10:23 2014 |
Koji | Update | LSC | Recycling cavity lengths | Com'on. This is just a 60ppm change of
the mod frequency from the nominal. How can
it change the recycling cav length by more |
|
|
10480
|
Tue Sep 9 23:05:01 2014 |
Koji | Update | CDS | OTTAVIA lost network connection | Today the network connection of OTTAVIA
was sporadic.
Then in the evening OTTAVIA lost |
|
|
10492
|
Wed Sep 10 22:17:29 2014 |
Koji | Summary | LSC | X/Y green beat mode overlap measurement | [Koji Manasa]
We made quantitative inspection of
the X/Y green beat setup on the PSL table. |
|
|
10500
|
Fri Sep 12 11:25:42 2014 |
Koji | Update | LSC | DRMI locking | This is great.
And I got confused. Is REFL11 going
through the CM board? |
|
|
10510
|
Tue Sep 16 16:03:36 2014 |
Koji | Update | PSL | Laser turned on |
|
|
|
10515
|
Wed Sep 17 18:36:03 2014 |
Koji | HowTo | General | How to run DTT measurement automatically |
Suppose you have a dtt template
name test.xml
The file test.dtt
|
|
|
10561
|
Thu Oct 2 20:54:45 2014 |
Koji | Update | IOO | IMC WFS measurements | [Eric Koji]
We made sensing matrix measurements
for the IMC WFS and the MC2 QPD. |
|
|
10566
|
Sun Oct 5 23:43:08 2014 |
Koji | Update | IOO | IMC WFS measurements | There are several non scientific reasons. |
|
|
10601
|
Mon Oct 13 16:57:26 2014 |
Koji | Update | CDS | Frame builder is mad | CPU load seems extremely high. You need
to reboot it, I think
controls@fb /proc 0$ cat loadavg |
|
|
10646
|
Tue Oct 28 14:07:28 2014 |
Koji | Update | IOO | IMC WFS sensing matrix measurement | Last night the sensing matrix for IMC WFS&QPD
were measured.
C1:IOO-MC(1, 2, 3)_(ASCPIT, ASCYAW)_EXC |
|
|
10659
|
Fri Oct 31 19:59:26 2014 |
Koji | Update | General | Some locking work / PRMI analysis | Preparations
- According to Diego's report, the
MC WFS gains were too high. We'll fix this |
|
|
10660
|
Sat Nov 1 02:13:11 2014 |
Koji | Configuration | LSC | LSC settings | I'm leaving the iFO now. It is left with
the IR arm mode.
I pretty much messed up LSC configurations |
|
|
10661
|
Sat Nov 1 16:06:32 2014 |
Koji | Configuration | LSC | DRMI locked | Continued from ELOG
10659
|
6x |
|
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. |
|
|
10664
|
Mon Nov 3 17:56:57 2014 |
Koji | Update | LSC | SRM calibration | SRM
Calibration
After the DRMI measurements on Friday, |
|
|
10669
|
Wed Nov 5 11:09:44 2014 |
Koji | Update | LSC | 3F RFPD RF spectra | If you look at the intermodulation at 14
(4+10) and 16 (6+10), 15 (5+10) would make
any problem, thanks to the notch at 1f and |
|
|
10675
|
Thu Nov 6 01:58:55 2014 |
Koji | Update | LSC | 3F RFPD RF spectra | Where is the PD out spectrum measured with
the coupler??? |
|
|
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. |
|
|
10695
|
Tue Nov 11 01:38:23 2014 |
Koji | Update | LSC | Notch at 110MHz | To further reduce the RF power at 110MHz
in the REFL165 chain, I made a twin-t notch
in a pomona box. |
|
|
10698
|
Tue Nov 11 21:41:09 2014 |
Koji | Update | LSC | 3f DRMI sensing mat | Sensing
matrix calculation using DTT + Matlab
Note: If the signal phase is, for |
|
|
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. |
|
|
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). |
|
|
10748
|
Wed Dec 3 01:46:12 2014 |
Koji | Update | LSC | Tried cav pole compensation trick - fail | Where did these 200Hz, 6kHz come from?
I wonder what are the correct
filters to be incorporated in the filter |
|