ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
5506
|
Wed Sep 21 21:13:35 2011 |
rana | Update | IOO | AM modulation misery | How about changing the x-axis of all these
plots into meters or picometers and tell
us how wide the PRC resonance is? (something |
|
5536
|
Sat Sep 24 01:51:02 2011 |
rana | Update | SUS | Oplev filter optimization for 2 poles and 2 zeros |
|
|
5596
|
Sun Oct 2 13:45:13 2011 |
rana | Summary | General | Recovery from the power shutdown: apache / svn | Restarted Apache on nodus using Yoichi's
wiki instructions. SVN is back up. |
|
5641
|
Mon Oct 10 10:14:43 2011 |
rana | Update | LSC | length fluctuations in SRCL | How does it make sense that the motion
at 0.1 Hz of PRC is 10x larger than MICH?
|
|
5649
|
Tue Oct 11 15:14:50 2011 |
rana | Update | LSC | BS actuator reponse at low frequency : measured |
|
|
5650
|
Tue Oct 11 15:19:17 2011 |
rana | HowTo | Environment | 40m map | The Kinemetrics dudes are |
 |
5662
|
Thu Oct 13 21:40:59 2011 |
rana | Summary | VAC | Recovery from the power shutdown is completed | As it turns out Steve is not crazy
in this particular instance: the vacuum computer,
linux3 , has some issues. I can login just |
|
5669
|
Sat Oct 15 10:58:32 2011 |
rana | Update | IOO | MC WFS Output Matrix determination | In order to save time and sanity, you
should not measure the pitch ->yaw and
yaw-> pitch. It makes things too complicated |
|
5673
|
Sun Oct 16 02:30:00 2011 |
rana | Update | Electronics | Testing REFL165 | Unless the bias feedback circuit has been
tuned for the 1 mm diode, its possible that
you are seeing some C(V) effects. Its easy |
|
5674
|
Sun Oct 16 05:35:18 2011 |
rana | Update | Computer Scripts / Programs | Failing to set SUS summary screen values |
|
|
5682
|
Mon Oct 17 23:28:32 2011 |
rana | Update | Electronics | StochMon | To get to the bottom of the RFAM mystery,
we've got to resurrect the StochMon to trend
the RFAM after the IMC. |
|
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 |
|
5748
|
Fri Oct 28 00:53:39 2011 |
rana | Update | Electronics | POP 22/110 Design | The attached PDF shows a possible gain
/ input noise config for the POP 22/110 that
we would use to detect the RF power in the |
|
5764
|
Sun Oct 30 14:08:35 2011 |
rana | Update | Electronics | RFAM monitor in place. ( Uncalibrated ) EPICS troubles |
|
|
5814
|
Fri Nov 4 19:30:06 2011 |
rana | Update | SUS | Dr. SUS paths updated--question of human oversight remains | My inclination is to not do the writing
of the matrices automatically nor to do the
weekly kicks. Its nice to have long locks |
|
5825
|
Sun Nov 6 21:09:03 2011 |
rana | Update | Adaptive Filtering | coherence |
|
|
5871
|
Fri Nov 11 10:30:27 2011 |
rana | Update | Adaptive Filtering | MC_F |
There should be a whitening
filter in the Pentek Generic DAQ board (Eurocard |
|
5884
|
Sat Nov 12 08:09:47 2011 |
rana | Update | IOO | MC WFS Servo: Open loop gain | Somehow, I generically don't like the idea
of lead filters for the WFS loops. We don't
really need so much bandwidth. I think you |
|
5889
|
Mon Nov 14 21:22:48 2011 |
rana | Configuration | Computers | primetime RSYNC slowing down NODUS | nodus:elog>w; who ; date
9:20pm up 44 day(s),
5:14, 5 users, load average: |
|
5944
|
Fri Nov 18 11:16:08 2011 |
rana | Update | IOO | eom box |
|
|
5945
|
Fri Nov 18 11:28:39 2011 |
rana | Update | Green Locking | Y end green PDH servo : it's okay |
|
|
5953
|
Fri Nov 18 23:44:33 2011 |
rana | Update | IOO | Mode cleaner noise projection | Could use some more detail on how this
measurement was done. It looks like you used
the SUSPOS signal with the mirror moving, |
|
5959
|
Sat Nov 19 10:41:30 2011 |
rana | Update | IOO | MC_WFS Servo: The MC2_TRANS_PIT and YAW loops switched ON | I'm quite sure that this is not good: since
MC2 can
produce a signal in WFS1 and WFS2, it cannot |
|
5965
|
Sun Nov 20 15:33:37 2011 |
rana | Update | General | recovery from the power shutdown | restarted Apache on Nodus for the
SVN as per wiki instructions |
|
6006
|
Fri Nov 25 17:52:28 2011 |
rana | Update | IOO | F2A filter for MC | Woo. Pretty crazy. The numerators should
only be ~10% larger than the denominator
below 1 Hz. Let's try again. |
|
6010
|
Fri Nov 25 20:41:48 2011 |
rana | Update | SUS | MC watchdogs | It seems as if someone was looking into
this on Wednesday, but as there's no elog,
I think probably not. |
|
6017
|
Sat Nov 26 10:55:40 2011 |
rana | Update | CDS | Beware of fancy filter modules |
Could be that what we're seeing
is the noise floor of the Direct Form II |
|
6021
|
Mon Nov 28 10:54:40 2011 |
rana | Update | SUS | F2A filter for MC | Our
approach to making the F2A or F2P filters |
|
6031
|
Mon Nov 28 22:09:24 2011 |
rana | Update | CDS | Beware of fancy filter modules | To see what might be causing the problem,
I used a version of the filter noise test
matlab code that Matt had in the elog. |
|
6062
|
Fri Dec 2 17:43:46 2011 |
rana | Update | digital noise | Foton error | It would be useful to see some plots so
we could figure out exactly what magnitude
and phase error correspond to "gross" |
|
6084
|
Thu Dec 8 00:04:50 2011 |
rana | Update | IOO | RAM Mon is now being demodulated | Monitoring good, but remember that the
EOM alignment must be done carefully to minimize
the RAM before we can use these trends. |
|
6085
|
Thu Dec 8 00:18:38 2011 |
rana | Summary | Computer Scripts / Programs | BURT restore problems / issues in snapshot scripts | I tried to run the seismic StripTool tonight,
which seems liek a simple task. But instead
I fell through the rabbit hole again... |
|
6114
|
Tue Dec 13 18:56:23 2011 |
rana | Update | IOO | PSL beam realigned into MC |
Of course, looking at the MC
transmission os the important thing, but |
|
6142
|
Wed Dec 21 14:23:08 2011 |
rana | Configuration | SUS | Hysteresis in suspensions? | While discussing the suspension hysteresis
measurements, Koji, Kiwamu, and I realized
that the suspension wire standoff is aluminum, |
|
6148
|
Fri Dec 23 15:55:12 2011 |
rana | Summary | Computer Scripts / Programs | CONLOG: not working since Oct 1 | Often people say "I |
|
6165
|
Wed Jan 4 02:43:40 2012 |
rana | Update | General | Actuators for Stewart platform |
|
|
6179
|
Fri Jan 6 20:10:48 2012 |
rana | Update | CDS | framebuilder back online, using NTP time syncronization |
|
|
6208
|
Tue Jan 17 19:07:47 2012 |
rana | Update | LSC | glitch hunting in REFL RFPDs : strange | Another possibility is that there
is some beam clipping of the REFL beam before
it gets to the PD. Then there could be a |
|
6216
|
Fri Jan 20 17:05:59 2012 |
rana | Update | Green Locking | Y arm ALS : time series |
|
|
6251
|
Fri Feb 3 19:54:21 2012 |
rana | Configuration | IOO | MC trans awry | As usual, I noticed several bad things
within 30 seconds of sitting in front of
the workstation. Today its that there are |
|
6252
|
Fri Feb 3 19:57:26 2012 |
rana | Configuration | SUS | PSL Shutter closed for SUS hysteresis test | Fri Feb 03 19:57:20 2012
Fri Feb 03 20:25:19 2012 :
Aligned all SUS to center their OL beams |
|
6253
|
Fri Feb 3 20:19:38 2012 |
rana | Update | SUS | Oplev QPD Sum Trends are suspicious | The attached trend shows a problem with
the QPD sums.
Why are ETMX |
|
6265
|
Thu Feb 9 20:01:02 2012 |
rana | Summary | Electronics | Using RF LP filters as dispersion units for the MFD | WE currently use long cables to give
us the dispersion that we want for the MFD.
A cable gives a long delay - both the phase |
|
6271
|
Fri Feb 10 15:47:38 2012 |
rana | Update | PEM | seismic noise back to normal |
Kiwamu and Steve maybe don't
know about how to trend seismic noise. If |
|
6275
|
Fri Feb 10 23:58:30 2012 |
rana | Update | PEM | seismic BLRMS loud too |
|
|
6289
|
Thu Feb 16 13:12:30 2012 |
rana | Update | LSC | sensing matrix of PRMI |
|
|
6315
|
Fri Feb 24 18:37:13 2012 |
rana | Update | LSC | Y arm + PRMI part II |
|
|
6335
|
Tue Feb 28 16:44:56 2012 |
rana | Update | LSC | MICH and PRCL signals in a simulation |
Like
I said, this is possible if you fail to set |
|
6367
|
Tue Mar 6 23:14:38 2012 |
rana | Update | SUS | Optical Lever had bad filters | We found that that bounce (16.1 Hz)
and roll (23.5 Hz) modes on the ITMX were
much higher than on the ITMY. After some |
|
6381
|
Wed Mar 7 21:13:30 2012 |
rana | Update | DAQ | NDS2 | I noticed that NDS2 was not running
on mafalda as it should be. Instead, there
were a couple of zombie MEDMs using up 99% |
|