| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
13174
|
Wed Aug 9 11:33:49 2017 |
gautam | Update | Electronics | MC2 de-whitening | Summary:
The analog de-whitening filters
for MC2 are different from those on the other |
|
|
13177
|
Wed Aug 9 12:35:47 2017 |
gautam | Update | ALS | Fiber ALS | Last week, we were talking about reviving
the Fiber ALS box. Right now, it's not
in great shape. Some changes to be made: |
|
|
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 |
|
|
13180
|
Wed Aug 9 19:21:18 2017 |
gautam | Update | ALS | ALS recovery | Summary:
Between frequent MC1 excursions,
I worked on ALS recovery today. Attachment |
|
|
13185
|
Thu Aug 10 14:25:52 2017 |
gautam | Update | CDS | Slow EPICS channels -> Frames re-enabled | I went into /opt/rtcds/caltech/c1/target/daqd, |
|
|
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 |
|
|
13189
|
Fri Aug 11 00:10:03 2017 |
gautam | Update | CDS | Slow EPICS channels -> Frames re-enabled | Seems
like something has failed after I did this |
|
|
13192
|
Fri Aug 11 11:14:24 2017 |
gautam | Update | CDS | Slow EPICS channels -> Frames re-enabled | I commented
out the line pertaining to C0EDCU again,
now full frames are being written |
|
|
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. |
|
|
13197
|
Fri Aug 11 18:53:35 2017 |
gautam | Update | CDS | Slow EPICS channels -> Frames re-enabled |
|
|
|
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 |
|
|
13204
|
Mon Aug 14 16:24:09 2017 |
gautam | Update | ALS | Fiber ALS | Today, I borrowed the fiber microscope
from Johannes and took a look at the fibers
coupled to the PDs. The PD labelled " |
|
|
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 |
|
|
13212
|
Wed Aug 16 14:54:13 2017 |
gautam | Update | CDS | PSL monitoring Acromag EPICS server restarted | [johannes,
gautam, jamie]
Made a directory |
|
|
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 |
|
|
13221
|
Wed Aug 16 20:01:03 2017 |
gautam | Update | General | SUS model ASC input weirdness | I'm not sure if this has something
to do with the model restarts / new RCG,
but while I was re-enabling the MC watchdogs, |
|
|
13222
|
Wed Aug 16 20:24:23 2017 |
gautam | Update | ALS | Fiber ALS | Today, with Johannes' help, I cleaned
the fiber tips of the photodiodes. The effect
of the cleaning was dramatic - see Attachments |
|
|
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 |
|
|
13228
|
Fri Aug 18 21:58:35 2017 |
gautam | Update | General | SUS model ASC input weirdness | I spent some time today trying to debug
this issue.
Jamie |
|
|
13229
|
Fri Aug 18 23:59:53 2017 |
gautam | Update | ALS | X Arm ALS lock | [ericq, gautam]
I was just getting the
IFO aligned, and single arm lock going, when |
|
|
13233
|
Mon Aug 21 14:53:32 2017 |
gautam | Update | VAC | RGA reset | [gautam, steve]
In the aftermath of the accidental
vent, it looks like the RGA was shutdown. |
|
|
13234
|
Mon Aug 21 16:35:48 2017 |
gautam | Update | VAC | UPS checkup | [steve, gautam]
At Rolf/Rich Abbott's request,
we performed a check of the UPS today. |
|
|
13236
|
Mon Aug 21 21:26:41 2017 |
gautam | Summary | General | Loss measurements plan | In case you want to use it, I had profiled
the Lightwave NPRO sometime back, and
we were even using it as the AUX X laser |
|
|
13237
|
Mon Aug 21 23:38:55 2017 |
gautam | Update | ALS | ALS out-of-loop noise | I worked a little bit on the Y arm ALS
today.
Started by locking the |
|
|
13238
|
Tue Aug 22 02:19:11 2017 |
gautam | Update | ALS | ALS OLTFs | Attachment #1 shows the
results of my measurements tonight (SR785
data in Attachment #2). |
|
|
13240
|
Tue Aug 22 15:40:06 2017 |
gautam | Update | Computers | Old frames accessible again | [jamie, gautam]
I had some trouble getting the
daqd processes up and running again using |
|
|
13242
|
Tue Aug 22 17:11:15 2017 |
gautam | Update | Computers | c1iscex model restarts | [jamie, gautam]
We tried to implement the fix
that Rolf suggested in order to solve (perhaps |
|
|
13243
|
Tue Aug 22 18:36:46 2017 |
gautam | Update | Computers | All FE models compiled against RCG3.4 | After getting the go ahead from Jamie,
I recompiled all the FE models against the
same version of RCG that we tested on the |
|
|
13246
|
Wed Aug 23 17:22:36 2017 |
gautam | Update | ALS | Fiber ALS - reinstalled | I completed the revamp of the box, and
re-installed the box on the PSL table today.
I think it would be ideal to install this |
|
|
13248
|
Thu Aug 24 00:39:47 2017 |
gautam | Update | LSC | DRMI locking attempt | Since the single arm locking and dither
alignment seemed to work alright after the
CDS overhaul, I decided to try some recycling |
|
|
13249
|
Thu Aug 24 17:36:11 2017 |
gautam | Update | CDS | FSS Slow Python maintenance | A couple of weeks ago, I was trying to
modernize the python version of the FSS Slow
temperature control loops, when I accidentally |
|
|
13252
|
Fri Aug 25 01:20:52 2017 |
gautam | Update | LSC | DRMI locking attempt | I tried some DRMI |
|
|
13253
|
Fri Aug 25 11:11:26 2017 |
gautam | Update | General | MC1 kicked again | Looks like MC1 got another big kick just
under 4 hours ago. None of the other optics
show any evidence of a glitch so it seems |
|
|
13254
|
Fri Aug 25 15:54:14 2017 |
gautam | Update | ALS | Fiber ALS noise measurement | [Kira, gautam]
Attachment #1 - Photo
of the revamped beat setup. The top panel |
|
|
13262
|
Mon Aug 28 16:20:00 2017 |
gautam | Update | CDS | 40m files backup situation | This elog is meant
to summarize the current backup situation |
|
|
13265
|
Tue Aug 29 01:52:22 2017 |
gautam | Update | SUS | Test mass actuator calibration | [ericq, gautam]
Tonight, |
|
|
13266
|
Tue Aug 29 02:08:39 2017 |
gautam | Update | ALS | Fiber ALS noise measurement | I was having a chat with EricQ about this
today, just noting some points from our discussion
down here so that I remember to look into |
|
|
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 |
|
|
13273
|
Wed Aug 30 10:54:26 2017 |
gautam | Update | CDS | slow machine bootfest | MC autolocker and FSS loops were stuck
because c1psl |
|
|
13275
|
Wed Aug 30 15:00:06 2017 |
gautam | Update | General | Edgeswitch fiber swap | A couple of minutes ago, Larry W swapped
the fibers to our 40m Edgeswitch (BROCADE
FWS 648G) to a faster connection. This is |
|
|
13276
|
Wed Aug 30 19:49:33 2017 |
gautam | Update | LSC | REFL55 demod board debugging | Summary:
Today
I tried debugging the mysterious increase
in REFL55 signal levels in the DRMI configuration. |
|
|
13280
|
Thu Aug 31 00:52:52 2017 |
gautam | Update | LSC | REFL55 whitening board debugging | [rana,gautam] |
|
|
13281
|
Thu Aug 31 03:31:15 2017 |
gautam | Update | LSC | DRMI re-locked! | After our Demod/Whitening electronics investigations
suggested nothing obviously wrong, I decided
to give DRMI locking another go tonight. |
|
|
13282
|
Thu Aug 31 18:36:23 2017 |
gautam | Update | CDS | revisiting Acromag | Current
status:
There
is a single Acromag ADC unit installed in |
|
|
13283
|
Thu Aug 31 21:40:24 2017 |
gautam | Update | General | MC1 kicked again | There was a pretty large glitch in MC1
about an hour ago. The misalignment was so
large that the autolocker wasn't able |
|
|
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.
|
|