| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15188
|
Wed Feb 5 16:35:12 2020 |
gautam | Update | LSC | Diagnosis plan | The goal is to try and identify the source
of the excess ALS noise as the CARM offset
is reduced. The idea is to look at the MC_F |
|
|
15187
|
Wed Feb 5 08:57:11 2020 |
Yehonathan | Update | PSL | Bench testing of PSL ai channels | I checked the failed channels against
the EPICS database definitions and the yaml
file inputted to IFOTest. The channels where |
|
|
15186
|
Tue Feb 4 18:13:01 2020 |
Yehonathan | Update | PSL | Bench testing of PSL ai channels | {Yehonathan, Jon, Jordan}
I tested the ai channels of the
new PSL Acromag by looping an already-tested |
|
|
15185
|
Tue Feb 4 02:13:02 2020 |
gautam | Update | LSC | Locking updates | Summary:
The CARM-->RF transition remains
out of reach. No systematic diagnosis scheme |
|
|
15184
|
Mon Feb 3 15:22:39 2020 |
Jon | Update | PSL | c1psl progress/Acromag ADC grounding | I tested the c1psl AO channels on the electronics
bench on Friday. While I found all the wiring
to be correct, some of the channels exhibited |
|
|
15183
|
Mon Feb 3 13:54:10 2020 |
Yehonathan | Update | IOO | IMC Ringdowns extended data analysis | I extended the ringdown data analysis to
the reflected beam following Isogai
et al. |
|
|
15182
|
Fri Jan 31 16:57:09 2020 |
gautam | Update | General | Metal PMC parts | Jon brought over a box of parts for constructing
the metal PMCs. I have stored it along the
Y-arm, on top of the green optics cabinet. |
|
|
15181
|
Fri Jan 31 16:04:30 2020 |
gautam | Update | IOO | Input pointing drift | One factor which hampers locking efforts
is the apparent drift of the input beam into
the IFO. Over timescales of ~1 hour, I have |
|
|
15180
|
Thu Jan 30 22:02:42 2020 |
shruti | Update | General | delay line frequency discriminator for PM | I could not find any level 3 mixers, but
by adjusting the beat frequency the power
in each of the delay line channels rose to |
|
|
15179
|
Thu Jan 30 17:41:10 2020 |
gautam | Update | PSL | Errant FSS_INOFFSET change | You can trend the data for the past few
hours and see what the appropriate value.
I think |
|
|
15178
|
Thu Jan 30 17:31:28 2020 |
Jon | Update | PSL | Errant FSS_INOFFSET change | A script I was testing errantly set C1:PSL-FSS_INOFFSET
=> 10 V at about 5:30 pm. I manually reverted
the channel value to 0, but I don't know |
|
|
15177
|
Thu Jan 30 15:24:10 2020 |
? | Update | General | delay line frequency discriminator for PM | yes, its fine to use this
with a level 3 or level 7 mixer; let's |
|
|
15176
|
Thu Jan 30 12:52:10 2020 |
Jon | Update | BHD | Metal OMCs procured | Last night Yehonathan and I located the
two steel PMCs in the QIL, with help from
Anchal. They are currently sitting on my |
|
|
15175
|
Wed Jan 29 12:40:24 2020 |
Yehonathan | Update | IOO | IMC Ringdowns preliminary data analysis | I analyze the IMC ringdown data from last
night.
Attachment 1 shows the normalized |
|
|
15174
|
Wed Jan 29 12:29:33 2020 |
shruti | Update | General | delay line frequency discriminator for PM | Today I began working on a TF measurement
based on the delay line frequency discriminator
setup in elog |
|
|
15173
|
Wed Jan 29 03:05:47 2020 |
rana, gautam | Update | SUS | MC misalignments / sat box games | In the last couple days, as the IMC ringdowns
have been going on, we have noticed that
the MC is behaving bad. Misaligning, drifting, |
|
|
15172
|
Wed Jan 29 00:29:43 2020 |
gautam | Update | LSC | locking 2020 | The goal tonight was to go through the
locking scripts to see if I could recover
the state from November 2019, when I could |
|
|
15171
|
Wed Jan 29 00:27:13 2020 |
gautam | Update | Computer Scripts / Programs | mcup / mcdown modified | To fix the apparent slowness of execution
of the caput |
|
|
15170
|
Tue Jan 28 20:51:37 2020 |
Yehonathan | Update | IOO | IMC WFS servos stable again | I resume my IMC ringdown activities now
that the IMC is aligned again.
To avoid any accidental misalignments |
|
|
15169
|
Tue Jan 28 19:40:15 2020 |
shruti | Update | General | PLL / PM measurement of Xend NPRO PZT | Over the past few days, I have been trying
to make measurements of the phase modulation
transfer function by modulating the X end |
|
|
15168
|
Tue Jan 28 19:12:30 2020 |
Jon | Configuration | PSL | Spare channels added to c1psl chassis | After some discussion with Gautam, I decided
to build more spare channels into the new
c1psl machine. This is anticipation of adding |
|
|
15167
|
Tue Jan 28 17:36:45 2020 |
gautam | Configuration | Computers | Local EPICS7.0 installed on megatron | [Jon, gautam]
We found that the caput |
|
|
15165
|
Tue Jan 28 16:01:17 2020 |
gautam | Update | IOO | IMC WFS servos stable again | With all of the shaking (man-made and divine),
it was a hard to debug this problem. Summary
of fixes: |
|
|
15164
|
Tue Jan 28 15:39:04 2020 |
gautam | Configuration | Computers | Sluggish megatron? | There were a bunch of medm processes stalled
on megatron (connected with screenshot taking).
To see if they were interfering with the |
|
|
15163
|
Tue Jan 28 14:33:24 2020 |
gautam | Update | PSL | Inferred free-running frequency noise | To conclude my PMC noise investigations:
Attachment |
|
|
15162
|
Tue Jan 28 08:26:53 2020 |
rana | Frogs | PEM | shaking | https://breakthrough.caltech.edu/magazine/2019-aug/#article-Listening-with-Light
|
|
|
15161
|
Mon Jan 27 21:48:49 2020 |
gautam | Update | PSL | Ringdown measurements | It's fine to block the WFS while doing
ringdowns |
|
|
15160
|
Mon Jan 27 21:35:06 2020 |
Yehonathan | Update | PSL | Ringdown measurements | Zeroth
order IMC ringdown setup
Following |
|
|
15159
|
Mon Jan 27 18:16:30 2020 |
gautam | Configuration | Computers | Sluggish megatron? | I've also been noticing that the IMC
Autolocker scripts are running rather sluggishly
on Megatron recently. Some evidence - on |
|
|
15158
|
Mon Jan 27 14:01:01 2020 |
Jordan | Configuration | General | Repurposed Sorenson Power Supply | The 24 V Sorenson (2nd from bottom) in
the small rack west of 1x2 was repurposed
to 12V 600 mA, and was run to a terminal |
|
|
15157
|
Sun Jan 26 14:40:55 2020 |
gautam | Update | ALS | ALS OOL noise | In preparation for resuming IFO locking
activities, I measured the ALS noise with
the arm lengths locked to IR, AUX laser frequencies |
|
|
15156
|
Sun Jan 26 13:47:00 2020 |
gautam | Update | PSL | PMC servo characterization | Summary:
I investigated the stage-by-stage
transfer functions of the PMC servo up till |
|
|
15155
|
Sun Jan 26 13:30:19 2020 |
gautam | Update | SUS | All watchdogs tripped, now restored | Looks like a M=4.6
earthquate in Barstow,CA tripped all
the suspensions. ITMX got stuck. I restored |
|
|
15154
|
Sat Jan 25 11:54:42 2020 |
Yehonathan | Update | PSL | Ringdown measurements | Zero
order beam PMC ringdown
On Wednesday I installed 3 |
|
|
15153
|
Fri Jan 24 17:14:01 2020 |
gautam | Update | ALS | Gain blocks installed | Jordan will write up the detailed elog
but in summary,
Former +24V Sorensen in |
|
|
15152
|
Fri Jan 24 15:42:08 2020 |
gautam | Update | PSL | PMC servo restored | The PMC servo was re-installed at ~345pm.
HV supplies were re-energized to their nominal
values. I will update the results of the |
|
|
15151
|
Fri Jan 24 13:56:21 2020 |
Jon | Update | BHD | BHD optics specifications | I've started a spreadsheet for the
BHD optics specifications and populated it
with my best initial guesses. There are a |
|
|
15150
|
Thu Jan 23 23:07:04 2020 |
Jon | Configuration | PSL | c1psl breakout board wiring | To facilitate wiring the c1psl chassis
and scripting loopback tests, I've
compiled a distilled spreadsheet with the |
|
|
15149
|
Thu Jan 23 22:10:01 2020 |
gautam | Update | PSL | PMC servo pulled out | While I have the board out, I'll try
and do a thorough investigation of TFs and
noise of the various stages. |
|
|
15148
|
Thu Jan 23 20:08:49 2020 |
shruti | Update | General | PLL / PM measurement of Xend NPRO PZT | Setup Update:
-
No more SR 560, upgraded to LB1005
P-I controller. Because: |
|
|
15147
|
Thu Jan 23 18:52:31 2020 |
gautam | Update | PSL | PMC RFPD characterization | Summary:
The RF transimpedance of the PMC
PDH RFPD was measured, and found to be |
|
|
15146
|
Thu Jan 23 16:37:14 2020 |
rana | Update | PSL | PMC VGA chip damaged? | doesn't seem so anomolous to me; we're
getting ~25 dB of gain range and the ideal
range would be 40 dB. My guess is that even |
|
|
15145
|
Thu Jan 23 15:32:42 2020 |
gautam | Configuration | Computers | Megatron: starts up grade | The burt snapshotting is still not so reliable
- for whatever reason, the number of snapshot
files that actually get written looks random. |
|
|
15144
|
Thu Jan 23 14:37:05 2020 |
gautam | Update | PSL | PMC VGA chip damaged? | [jordan, gautam]
Summary: |
|
|
15143
|
Wed Jan 22 20:12:36 2020 |
gautam | Update | PSL | PMC demodulator electrical characterization | Summary:
The mixer
+ LPF |
|
|
15142
|
Wed Jan 22 19:17:20 2020 |
gautam | Configuration | Computers | Megatron: starts up grade | upgrade was done
cronjob testing wasn't one
by one 😢 |
|
|
15141
|
Wed Jan 22 16:38:01 2020 |
rana | Update | Computers | rossa revival | wiped and install Debian 10 on rossa today
still to be done: config it as
CDS workstation |
|
|
15140
|
Wed Jan 22 16:19:47 2020 |
Jon | Update | VAC | TP3 controller errors | Gautam and I debugged a communications
problem with TP3 that was causing its python
service to fail. We traced the problem back |
|
|
15139
|
Wed Jan 22 11:22:39 2020 |
gautam | Update | PSL | PMC modulation depth measurement | Summary:
I estimate the PMC servo modulation
depth to be approximately |
|
|
15138
|
Wed Jan 22 11:00:21 2020 |
gautam | Update | PSL | PMC REFL ghost beam | I looked into this a little more today.
The steering optic used
to route PMC REFL to the RFPD is in fact |
|