ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
13128
|
Wed Jul 19 18:24:15 2017 |
rana | Summary | SUS | oplev laser summary updated | The $1000 HeNe should not be used for illuminating
fibers.
You should purchase these (total |
|
13129
|
Fri Jul 21 08:05:07 2017 |
Steve | Summary | SUS | red, blue, green laser diodes ordered | Also ordered 1 ea.
Blue
20mW |
|
13146
|
Thu Jul 27 22:42:24 2017 |
gautam | Update | SUS | Seismic noise, DAC noise, and Coil Driver electronics noise | Summary:
|
  |
13168
|
Sat Aug 5 11:04:07 2017 |
gautam | Update | SUS | MC1 glitches return | See Attachment #1, which is full (2048Hz)
data for a 3 minute stretch around when I
saw the MC1 glitch. At the time of the glitch, |
 |
13173
|
Tue Aug 8 20:48:06 2017 |
gautam | Update | SUS | ITMX stuck | Somewhere between CDS model restarts |
|
13178
|
Wed Aug 9 15:15:47 2017 |
gautam | Update | SUS | MC1 glitches return | Happened again just now, although the characteristics
of the glitch are very different from the
previous post, its less abrupt. Only actuation |
|
13182
|
Thu Aug 10 09:31:57 2017 |
Steve | Update | SUS | ITMX sensor voltage | There must be some bad connection
|
 |
13187
|
Thu Aug 10 21:01:43 2017 |
gautam | Update | SUS | MC1 glitches debugging | I have squished cables in all the places
I can think of - but MC1 has been glitching
regularly today. Before starting to pull |
 |
13195
|
Fri Aug 11 12:32:46 2017 |
gautam | Update | SUS | MC1 glitches debugging | Attachment #1: Free swinging
sensor spectra. I havent done any peak fitting
but the locations of the resonances seem |
  |
13196
|
Fri Aug 11 17:36:47 2017 |
gautam | Update | SUS | MC1 <--> MC3 | About 30mins ago, I saw another glitch
on MC1 - this
happened while the Watchdog was shutdown. |
|
13199
|
Sat Aug 12 14:09:36 2017 |
gautam | Update | SUS | Glitches stay on MC1 | Even
in the switched state, the glitches stayed
on MC1.
The coil |
  |
13200
|
Sat Aug 12 22:35:22 2017 |
rana | Update | SUS | Glitches stay on MC1 | To add to Gautam's entry: we swapped
the cables at the coil driver side (these
are the ones that go from coil driver to |
|
13201
|
Sun Aug 13 01:35:09 2017 |
Koji | Update | SUS | Glitches stay on MC1 | We used to have similar suspension excursion
at ETMX. This was the motivation to replace
the stand-offs from Al ones to ruby ones. |
|
13206
|
Mon Aug 14 20:01:38 2017 |
gautam | Update | SUS | Glitches stay on MC1 | I don't think we can say for sure. I
was just talking to EricQ about this, he
said the glitches were often seen when changing |
|
13220
|
Wed Aug 16 19:50:17 2017 |
gautam | Update | SUS | MC1 <--> MC3 switched back | Now that all the CDS overview lights are
green, I decided to switch back the coil
driver outputs to their original state so |
|
13225
|
Thu Aug 17 11:17:49 2017 |
gautam | Update | SUS | MC1 <--> MC3 switched back | Seems like this modification didn't
really work. There were several large MC1
glitches, and one of them misaligned MC1 |
 |
13226
|
Thu Aug 17 17:33:01 2017 |
gautam | Update | SUS | MC1 <--> MC3 switched back | that's why the Autolocker clears the
outputs; we don't want to be holding
the offsets from the last ms of lock when |
|
13231
|
Mon Aug 21 09:08:54 2017 |
Steve | Update | SUS | tiny glitches | They are synchronised tiny glitches. They
are not mechanical.
|
|
13261
|
Mon Aug 28 10:51:21 2017 |
steve | Update | SUS | ETMX damping recovered | |
|
13265
|
Tue Aug 29 01:52:22 2017 |
gautam | Update | SUS | Test mass actuator calibration | [ericq, gautam]
Tonight, |
|
13267
|
Tue Aug 29 15:04:59 2017 |
gautam | Update | SUS | ETMY Oplev PIT loop gain changed | Last night, while we were working on the
ALS, I noticed the GTRY spot moving around
(in PITCH) on the CCD monitor in the control |
 |
13284
|
Fri Sep 1 08:25:08 2017 |
Steve | Update | SUS | MC1 glitching | MC1, MC2 and MC3 damping turned off to
see glitching action at 9:57am
|
 |
13286
|
Fri Sep 1 16:27:39 2017 |
gautam | Update | SUS | MC1 glitching | I re-enabled the MC SUS damping and IMC
locking for some IFO work just now.
|
|
13392
|
Wed Oct 18 17:34:09 2017 |
gautam | Update | SUS | ASDC | Summary:
The signal path for the ASDC signal
is AS55 |
|
13417
|
Wed Nov 8 12:19:55 2017 |
gautam | Update | SUS | coil driver series resistance | We've been talking about increasing
the series resistance for the coil driver
path for the test masses. One consequence |
|
13429
|
Thu Nov 16 00:14:47 2017 |
Udit Khandelwal | Update | SUS | SOS Sapphire Prism design | Summary:
SOS solidworks model is
nearly complete
Having trouble |
|
13430
|
Thu Nov 16 00:45:39 2017 |
gautam | Update | SUS | SOS Sapphire Prism design |
|
|
13523
|
Wed Jan 10 12:42:27 2018 |
gautam | Update | SUS | ETMX DC alignment | I've been observing this for a few
days: ETMX's DC alignment seems to drift
by so much that the previously |
|
13527
|
Wed Jan 10 18:53:31 2018 |
gautam | Update | SUS | ETMX DC alignment | I should've put in the SUSPIT and SUSYAW
channels in the previous screenshot. I re-aligned
ETMX till I could see IR flashes in the arm, |
|
13528
|
Wed Jan 10 22:19:44 2018 |
rana | Update | SUS | ETMX DC alignment | Best to just calibrate the ETM OL in the
usual way. I bet the OSEM outputs have a
cal uncertainty of ~50% since the input matrix |
|
13589
|
Wed Jan 31 15:27:55 2018 |
gautam | Update | SUS | SUS MEDM master screens updated | I've often gotten confused by the labeling
on the SUS MEDM screens about the coil "Vmon"
fields - they're labelled as "30 |
|
13617
|
Wed Feb 7 16:09:06 2018 |
Steve | Update | SUS | ETMX -15V dc corrected | The ETMX Sorrenson power supply -15V
was running at -13.9V |
|
13731
|
Thu Apr 5 13:46:42 2018 |
gautam | Update | SUS | big earthquake | Seems like there was a 5.3 magnitude EQ
~10km from us (though I didn't feel it).
All watchdogs were tripped so our mirrors |
|
13747
|
Wed Apr 11 10:47:26 2018 |
Steve | Update | SUS | satellite amps labeled | Satellite amplifiers labeled with date.
Old labels left on. |
|
13815
|
Fri May 4 18:59:39 2018 |
gautam | Update | SUS | Stack measurement ongoing | [SV,KA,RXA,GV]
The |
|
13821
|
Mon May 7 15:27:28 2018 |
gautam | Update | SUS | Stack measurement expectation | [steve,gautam]
We tried to estimate what the load
cell measurement should yield. Here is the |
|
13860
|
Thu May 17 18:05:01 2018 |
gautam | Update | SUS | SR785 near 1X5 | I'm working near 1X5 and there is an
SR785 adjacent to the electronics rack with
some cabling running along the floor. I plan |
|
13861
|
Fri May 18 07:41:01 2018 |
steve | Update | SUS | clipping ITMX oplev | The ITMX oplev
still clipping
|
|
13862
|
Fri May 18 09:13:41 2018 |
Pooja | Update | SUS | Colored GigE image | To obtain a colored version with good contrast
of the grayscale image of scattering of light
by dust particles on the surface of test |
 |
13901
|
Thu May 31 10:19:42 2018 |
gautam | Update | SUS | MC3 glitchy | Seems like as a result of my recent poking
around at 1X6, MC3 is more glitchy than usual
(I've noticed that the IMC lock duty |
|
13988
|
Tue Jun 19 23:27:27 2018 |
gautam | Update | SUS | ETMX coil driver work in AM tomorrow | Per discussion today eve, barring objections, |
|
13992
|
Thu Jun 21 00:14:01 2018 |
gautam | Update | SUS | ETMX coil driver out | I finished the re-soldering work today,
and have measured the coil driver noise pre-Mods
and post-Mods. Analysis tomorrow. I am holding |
|
13993
|
Thu Jun 21 03:13:37 2018 |
gautam | Update | SUS | ETMX coil driver noise | I decided to take a quick look at the data.
Changes made to the ETMX coil driver board:
Fast path series resistances: |
  |
13999
|
Thu Jun 21 18:25:57 2018 |
gautam | Update | SUS | ETMX coil driver re-installed | Initial tests look promising. Local damping
works and I
even locked the X arm using POX, |
|
14004
|
Fri Jun 22 08:50:33 2018 |
Steve | Update | SUS | ITMY_UL sensor | We may lost the UL magnet or LED |
|
14009
|
Fri Jun 22 18:30:21 2018 |
gautam | Update | SUS | ITMY_UL sensor | I think if the magnet fell off, we would
see high DC signal, and not 0 as we do now.
I suspect satellite box or PD readout board/cabling. |
|
14012
|
Sun Jun 24 20:02:07 2018 |
gautam | Update | SUS | Some notes about coil driver noise | Summary:
For a series resistance of 4.5
kohm, we are suffering from the noise-gain |
  |
14019
|
Tue Jun 26 16:28:00 2018 |
gautam | Update | SUS | Coil driver protoboard characterization | I wanted to investigate my coil driver
noise measurement technique under more controlled
circumstances, so I spent yesterday setting |
   |
14032
|
Thu Jun 28 16:48:27 2018 |
gautam | Update | SUS | SOS cage towers | For the upcoming vent, we'd like to
rotate the SOS towers to correct for the
large YAW bias voltages used for DC alignment |
|
14034
|
Mon Jul 2 09:01:11 2018 |
Steve | Update | SUS | ITMY_UL sensor | This bad connection is coming back
|
|