ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15125
|
Wed Jan 15 14:10:28 2020 |
Jon | Configuration | PSL | New EPICS database for C1PSL + C1IOO | Summary
I have completed the
new EPICS channel database for the c1psl
and c1ioo channels |
|
|
15126
|
Wed Jan 15 15:04:31 2020 |
gautam | Update | PSL | PMC Linewidth measurement | For the ringdowns, I suggest you replicate
the setup
I had - infrastructurally, this was quite |
|
|
15127
|
Wed Jan 15 16:08:40 2020 |
not gautam | Update | PSL | Assembly underway for c1psl upgrade | You're right. We had the right
idea before but we got confused about this
issue. I changed all the XT1121s to XT1111 |
|
|
15128
|
Wed Jan 15 16:54:51 2020 |
gautam | Update | General | PDA10CF removed from AS table | Per Yehonathan's request, I removed
one PDA10CF from a pickoff of REFL on the
AS table (it was being used for the mode |
|
|
15129
|
Thu Jan 16 19:32:23 2020 |
shruti | Update | General | PLL / PM measurement of Xend NPRO PZT | With Gautam's help today the PLL managed
to be be locked for a few brief moments.
Turns out the signal power of the beat was |
|
|
15130
|
Fri Jan 17 18:02:21 2020 |
gautam | Update | ALS | Gain blocks packaged and characterized | Summary:
The ZHL-1010+
gain blocks acquired from MiniCircuits |
|
|
15131
|
Fri Jan 17 21:56:22 2020 |
Yehonathan | Update | PSL | AOM first order beam alignment | Today I noticed that the beam reflected
from the PMC into the RFPD has a ghost (attachment)
due to reflection from the back of the high |
|
|
15132
|
Fri Jan 17 22:11:19 2020 |
Yehonathan | Update | PSL | Ringdown measurements | I prepare for the ringdown measurement
of the PMC according to Gautam's previous
experiments. |
|
|
15133
|
Mon Jan 20 12:16:50 2020 |
gautam | Update | PSL | PMC input reverted to AOM zeroth order beam | Summary:
The input beam to the PMC
cavity was changed back to the zeroth order |
|
|
15134
|
Mon Jan 20 15:11:20 2020 |
gautam | Update | PSL | PMCT photodiode grounding issue | For a few days, I've noticed that the
PSL overview StripTool panel shows PMC transmission
and FSS RMTEMP channels with variation that |
|
|
15135
|
Mon Jan 20 20:20:36 2020 |
gautam | Update | PSL | PMC servo checkout | Summary:
The PDH discriminant of the PMC
servo was measured to be ~ |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 😢 |
|
|
15143
|
Wed Jan 22 20:12:36 2020 |
gautam | Update | PSL | PMC demodulator electrical characterization | Summary:
The mixer
+ LPF |
|
|
15144
|
Thu Jan 23 14:37:05 2020 |
gautam | Update | PSL | PMC VGA chip damaged? | [jordan, gautam]
Summary: |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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: |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
15154
|
Sat Jan 25 11:54:42 2020 |
Yehonathan | Update | PSL | Ringdown measurements | Zero
order beam PMC ringdown
On Wednesday I installed 3 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
15160
|
Mon Jan 27 21:35:06 2020 |
Yehonathan | Update | PSL | Ringdown measurements | Zeroth
order IMC ringdown setup
Following |
|
|
15161
|
Mon Jan 27 21:48:49 2020 |
gautam | Update | PSL | Ringdown measurements | It's fine to block the WFS while doing
ringdowns |
|
|
15162
|
Tue Jan 28 08:26:53 2020 |
rana | Frogs | PEM | shaking | https://breakthrough.caltech.edu/magazine/2019-aug/#article-Listening-with-Light
|
|
|
15163
|
Tue Jan 28 14:33:24 2020 |
gautam | Update | PSL | Inferred free-running frequency noise | To conclude my PMC noise investigations:
Attachment |
|
|
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 |
|
|
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: |
|
|
15167
|
Tue Jan 28 17:36:45 2020 |
gautam | Configuration | Computers | Local EPICS7.0 installed on megatron | [Jon, gautam]
We found that the caput |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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, |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|