| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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. |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
15161
|
Mon Jan 27 21:48:49 2020 |
gautam | Update | PSL | Ringdown measurements | It's fine to block the WFS while doing
ringdowns |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
15191
|
Thu Feb 6 01:16:58 2020 |
gautam | Update | LSC | Diagnosis results | Summary:
I did some more detailed tests
to see if I could isolate where the excess |
|
|
15192
|
Thu Feb 6 01:25:50 2020 |
gautam | Update | LSC | Locking updates | Summary:
I managed to partially stabilize
the arm citculating powers - they stay in |
|
|
15195
|
Fri Feb 7 02:24:24 2020 |
gautam | Update | LSC | Some short notes | [koji, gautam]
Plots + interpretation tomorrow.
CM_Slow path can be used |
|
|
15199
|
Fri Feb 7 15:00:16 2020 |
gautam | Update | LSC | More high BW POY experiments | To study the evilution of the AO path TFs
a bit more, I've hooked up POY11_Q Mon
to IN1 of the CM board. I will revert the |
|
|
15202
|
Mon Feb 10 10:07:20 2020 |
gautam | Update | PSL | PMC re-locked | I found the PMC unlocked this morning.
It was re-locked using the usual procedure.
I feel like this has been happening more |
|
|
15208
|
Wed Feb 12 12:13:37 2020 |
gautam | Update | LSC | AO path attempts | Summary:
The
PRFPMI can be controlled by a mix of ALS |
|
|
15209
|
Thu Feb 13 01:47:39 2020 |
gautam | Update | ALS | Fast ALS - delay line prep | A few years ago, Koji and I setup a delay
line phase shifter, which can be used to
impart a (switchable) delay to a signal path. |
|
|
15210
|
Thu Feb 13 02:07:26 2020 |
gautam | Update | LSC | AO path transfer function measurement | Summary:
I measured the transfer function
of the AO path, and think that there are |
|
|
15212
|
Fri Feb 14 00:53:50 2020 |
gautam | Update | ALS | Fast ALS - more setup | In the process of setting up some cabling
at 1Y2, I must've bumped a cable to the
c1lsc expansion chassis. Anyways, the c1lsc |
|
|
15214
|
Fri Feb 14 14:52:41 2020 |
gautam | Update | ALS | ALS OOL noise with arms locked | Unlikely, the alignment was probably just
not good. I restored the alignment and now
the arms can be locked to IR frequency. |
|
|
15227
|
Wed Feb 26 22:05:06 2020 |
gautam | Update | IOO | IMC checks | Today, I did the following tests (and so
was touching electronics/cables at/around
1X2): |
|
|
15228
|
Wed Feb 26 22:09:52 2020 |
gautam | Summary | BHD | Projected IFO noise budget, post-BHD upgrade | The quantum noise curves here are not correct.
c.f. amplitude quadrature noise
budget. |
|
|
15229
|
Wed Feb 26 23:50:51 2020 |
gautam | Update | IOO | IMC checks | In the style of the KA characterization
of the CM board, the AO path gain EPICS slider
(IN2) of the IMC servo board was stepped |
|
|
15230
|
Thu Feb 27 15:50:37 2020 |
gautam | Update | Electronics | FSS box power cable removed | In 1X1, there is a box labelled "FSS
REF" below a KEPCO HV supply. This box
had a power cable that wasn't actually |
|
|
15231
|
Thu Feb 27 17:50:36 2020 |
gautam | Update | PSL | c1psl setup setup | [many people]
in prep for the install tomorrow,
we did the following: |
|
|
15232
|
Thu Feb 27 17:59:02 2020 |
gautam | Update | LSC | Some AO thoughts | While my checks of the AO signal path have
thrown up some unanswered questions, I don't
think there's any evidence in those measurements |
|
|
15233
|
Thu Feb 27 22:45:40 2020 |
gautam | Update | ALS | ALS noise high | There was some UNELOGGED work at EX today.
The DFD outputs were also hijacked for loss
measurement. Unclear |
|
|
15234
|
Fri Feb 28 08:05:22 2020 |
gautam | Update | PSL | c1psl setup setup | And so it begins.
|
|
|
15235
|
Fri Feb 28 10:04:41 2020 |
gautam | Update | PSL | c1psl setup setup | Summary:
There are several problems evident
already. |
|
|
15236
|
Fri Feb 28 19:37:18 2020 |
gautam | Update | PSL | New c1psl installed |
The new c1psl Acromag crate is
now interfaced to the Eurocrate electronics
in 1X1 (formerly VME c1psl) and 1X2 (formerly |
|
|
15237
|
Mon Mar 2 16:14:47 2020 |
gautam | Update | CDS | some target directory cleanup | $TARGET_DIR |
|
|
15238
|
Mon Mar 2 16:29:40 2020 |
gautam | Update | Electronics | c1psl VME crate removed, Acro-crate installed | [JV, JWR, YD, GV]
The old c1psl VME crate,
and all the ribbon cables connected to it |
|
|
15239
|
Mon Mar 2 16:35:12 2020 |
gautam | Update | CDS | c1psl test status | Channel |
|
|
15240
|
Mon Mar 2 19:32:41 2020 |
gautam | Update | CDS | c1rfm errors | Had to reboot both end machines and the
c1rfm model to get the TRX and TRY signals
to the LSC models. Now both arms can be locked |
|
|
15242
|
Tue Mar 3 17:20:14 2020 |
gautam | Update | Electronics | More cabling removed | Jordan and I removed another 10 kg of cabling
from 1X2. The c1iool0 crate now has all cabling
to it disconnected - but it remains in the |
|
|
15245
|
Tue Mar 3 19:11:48 2020 |
gautam | Update | LSC | Some locking prep |
Re-aligned and locked the arm cavities
for IR and green.
Re-set trans
normalization because after the c1iscex |
|