| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15038
|
Wed Nov 20 12:14:17 2019 |
gautam | Update | LSC | Locking - progress | I took a look at the TRX/TRY RIN reported
in the single arm POX/POY lock, and compared
the performance of the two available PDs |
|
|
15037
|
Wed Nov 20 01:07:18 2019 |
gautam | Update | LSC | Locking - progress | Summary:
CARM offset was reduced
to 0 with the PRMI locked.
TRY |
|
|
15036
|
Tue Nov 19 21:53:57 2019 |
gautam | Update | PEM | Follow-up on seismometer discussion | The shaking started earlier today than
yesterday, at ~9pm local time.
While the IFO is shaking, I thought |
|
|
15035
|
Tue Nov 19 15:08:48 2019 |
gautam | Update | CDS | Vertex models rebooted | Jon and I were surveying the CDS situation
so that he can prepare a report for discussion
with Rolf/Rich about our upcoming BHD upgrade. |
|
|
15034
|
Mon Nov 18 21:04:38 2019 |
gautam | Update | LSC | Locking - some ideas | Some ideas Koji suggested:
Try approaching the CARM
offset zero point "from the other side" |
|
|
15033
|
Mon Nov 18 16:32:15 2019 |
gautam | Update | Computers | ZITA: started upgrade from Ubuntu 14 LTS to 18 LTS | the upgrade seems to have been successfully
executed - the machine was restarted at ~430pm
local time. Projector remains off and diagnostic |
|
|
15032
|
Mon Nov 18 14:32:53 2019 |
gautam | Update | PEM | Follow-up on seismometer discussion | The nightly seismic activity enhancement
continued during the weekend. It always shows
up around 10pm local time, persists for ~1 |
|
|
15031
|
Fri Nov 15 18:59:08 2019 |
rana | Update | Computers | ZITA: started upgrade from Ubuntu 14 LTS to 18 LTS | and so it begins...until this is finished
I have turned off the projector and moved
the striptools to the big TV (time to look |
|
|
15030
|
Fri Nov 15 12:16:48 2019 |
gautam | Update | PEM | Follow-up on seismometer discussion | Attachment
#1 is a spectrogram |
|
|
15029
|
Fri Nov 15 12:08:04 2019 |
gautam | Update | LSC | POPDC whitening board | The DC port of the Bias-Tee is routed to
(a modified
version of) the iLIGO whitening board. |
|
|
15028
|
Fri Nov 15 11:58:12 2019 |
gautam | Update | LSC | off the bad Violin filters | The clue was that the loop X arm POX loop looked
to have low (<3dB)) gain margin around
600 Hz (and again at 700 Hz). |
|
|
15027
|
Fri Nov 15 00:18:41 2019 |
rana | Update | PEM | Follow-up on seismometer discussion | The large ground motion at 1 Hz started
up again tonight at around 23:30. I walked
around the lab and nearby buildings with |
|
|
15026
|
Thu Nov 14 23:56:18 2019 |
rana | Update | LSC | off the bad Violin filters | We turned off many excessive violin mode
bandstop filters in the LSC.
Due to some feedforward work by |
|
|
15025
|
Thu Nov 14 12:11:04 2019 |
rana | Update | PEM | Follow-up on seismometer discussion | at 1 Hz' this effect is not large so
that's real translation. at lower frequencies
a ground tilt couples to the horizontal sensors |
|
|
15024
|
Wed Nov 13 23:40:15 2019 |
gautam | Update | PEM | Follow-up on seismometer discussion | Here is some disturbance
in the spacetime curvature, where the local |
|
|
15023
|
Wed Nov 13 20:15:56 2019 |
rana | Update | PEM | Follow-up on seismometer discussion | this
is due to the Equivalence Principle: local |
|
|
15022
|
Wed Nov 13 19:34:45 2019 |
gautam | Update | PEM | Follow-up on seismometer discussion | Attachment
#1 shows the spectra |
|
|
15021
|
Thu Nov 7 17:55:37 2019 |
shruti | Update | Computer Scripts / Programs | Python packages on donatella | Today I realized that pip and other python2,3
packages were installed in the conda base
environment, so after running |
|
|
15020
|
Thu Nov 7 17:46:10 2019 |
shruti | Update | ALS | AM measurement at X end | Some details:
- There
was a SR560+SR785 (not connected for measurement)
placed near the X end which I moved; it is |
|
|
15019
|
Wed Nov 6 20:34:28 2019 |
Koji | Update | IOO | Power combiner loss (EOM resonant box installed) | Gautam and I were talking about some modulation
and demodulation and wondered what is the
power combining situation for the triple |
|
|
Draft
|
Wed Nov 6 20:34:08 2019 |
Koji | Update | IOO | EOM resonant box installed |
|
|
|
15017
|
Wed Nov 6 19:26:57 2019 |
gautam | Update | PSL | Some PSL cable admin | Koji and I taked about cleaning up some
of the flaky cable situation on the PSL table
a while ago. The changes were implemented |
|
|
15016
|
Wed Nov 6 17:45:34 2019 |
gautam | Update | LSC | ~ | Here is a comparison of the response of
various DoFs in our various RFPD sensors
for two different CARM offsets. Even in the |
|
|
15015
|
Wed Nov 6 17:05:45 2019 |
gautam | Update | LSC | CARM calibration | Summary:
A coarse calibration of the CARM
error point (when on ALS control) is |
|
|
15014
|
Wed Nov 6 02:08:48 2019 |
gautam | Update | LSC | Locking updates | Summary:
There seems to be stronger-than-expected
coupling between CARM and the 3f sensors. |
|
|
15013
|
Tue Nov 5 12:37:50 2019 |
gautam | Update | PEM | T240 interface unit pulled out | I removed the Trillium T240 DAQ interface
unit from 1X4 for investigation.
It |
|
|
15012
|
Tue Nov 5 11:52:27 2019 |
gautam | Update | LSC | Locking notes | Summary:
I am still unable to achieve arm
powers greater than TRX/TRY ~10 while keeping |
|
|
15011
|
Mon Nov 4 19:02:25 2019 |
Yehonathan | Update | PSL | Mapping the PSL electronics | I created a spreadsheet (Attached) by taking Koji's
c1psl sheet from slow_channel_list and filtering
out the channels that do not need an Acromag. |
|
|
15010
|
Mon Nov 4 16:06:58 2019 |
gautam | Update | LSC | POP optical path | I did some re-alignment of the POP beam
on the IX in air table. Here are the details:
|
|
|
15009
|
Mon Nov 4 15:29:47 2019 |
gautam | Update | LSC | POP signal path | There are many versions of the POP22 signal
path I found on the elog, e.g. this
thread. But what I saw at the LSC rack |
|
|
15008
|
Mon Nov 4 13:26:04 2019 |
Yehonathan | Update | PSL | Up to date sketch of the 1x1 and 1x2 Eurocrates | Done.
|
|
|
15007
|
Mon Nov 4 11:41:28 2019 |
shruti | Update | Computer Scripts / Programs | Epics installed on donatella | I've installed pyepics on Donatella
running
sudo yum install pyepics |
|
|
15006
|
Sat Nov 2 17:08:34 2019 |
Yehonathan | Update | PSL | Up to date sketch of the 1x1 and 1x2 Eurocrates | Thanks. Please update this wiki page too.
https://wiki-40m.ligo.caltech.edu/Electronics/ElectronicsRacks#A1X1 |
|
|
15005
|
Sat Nov 2 16:36:55 2019 |
Yehonathan | Update | PSL | Up to date sketch of the 1x1 and 1x2 Eurocrates | I reproduced Gautam's sketch of the
1x1 and 1x2 Eurocrates into a pdf image
that contains links to the appropriate DCCs |
|
|
15004
|
Thu Oct 31 10:44:40 2019 |
gautam | Update | PSL | PMC re-locked | PMC got unlocked at ~4am. I re-locked it.
Also tweaked the input pointing into the
cavity. The misalignment was mostly in pitch. |
|
|
15003
|
Wed Oct 30 23:12:27 2019 |
Koji | Update | SUS | PRM suspension issues | Sigh... hard loch |
|
|
15002
|
Wed Oct 30 19:20:27 2019 |
gautam | Update | SUS | PRM suspension issues | While I was trying to lock the PRMI this
evening, I noticed that I couldn't move
the REFL beamspot on the CCD field of view |
|
|
15001
|
Wed Oct 30 17:08:40 2019 |
gautam | Update | LSC | POP22 investigation | The POP beam coming out of the vacuum chamber
is split by a 50/50 BS and half is diverted
to the POP22/POP110/POPDC photodiode (Thorlabs |
|
|
15000
|
Wed Oct 30 11:53:41 2019 |
gautam | Update | LSC | MICH loop shape tuning | I changed the shape of the low pass filter
to reduce high frequency sensor noise injection
into the MICH control signal. The loop stability |
|
|
14999
|
Wed Oct 30 01:27:00 2019 |
gautam | Update | LSC | More locking updates | Tried a bunch of things tonight.
Modified the "ELP300"
filter module in the MICH filter bank - this |
|
|
14998
|
Tue Oct 29 17:40:48 2019 |
gautam | Update | LSC | More locking updates | I set up a photodiode (PDA10CF) in the
IFO REFL beampath and the Agilent NA is sitting
on the east side of the PSL enclosure. This |
|
|
14997
|
Tue Oct 29 15:13:19 2019 |
gautam | Update | LSC | More locking updates | I looked at some signals for a 10 second
period when the PRMI was locked with at some
CARM offset, just before the PRMI lost lock, |
|
|
14996
|
Tue Oct 29 01:24:45 2019 |
gautam | Update | LSC | More locking updates | Summary:
The two arm lengths can
be controlled reliably in the CARM/DARM basis |
|
|
14995
|
Mon Oct 28 23:20:11 2019 |
gautam | Update | ALS | ALS power budget |
IR |
|
|
14994
|
Mon Oct 28 18:55:06 2019 |
rana | Update | Computers | rossa revival | back
on new Rossa from Xi computing
switched to using Display |
|
|
14993
|
Fri Oct 25 01:04:49 2019 |
gautam | Update | ALS | ALS electronics chain was saturating | [Koji, gautam]
Summary:
We think we got to the bottom of |
|
|
14992
|
Thu Oct 24 18:37:15 2019 |
gautam | Update | PEM | T240 checkout | Summary:
The Trillium T240 seismometer
needs |
|
|
14991
|
Thu Oct 24 11:58:16 2019 |
gautam | Update | ASC | PRC angular feedforward | Summary:
I'd like to revive the PRC
angular feedforward system. However, |
|
|
14990
|
Wed Oct 23 18:40:58 2019 |
gautam | Update | CDS | another round of vertex FE reboots | I wanted to restart the c1oaf model. As
usual, the first time the model was restarted,
it came back online with a 0x2bad error. |
|
|
14989
|
Wed Oct 23 11:49:21 2019 |
gautam | Update | PEM | PEM BLRMS anomaly | I looked into the seismometer situation
a bit more today. Here is the story so far
- I think more investigation is required: |
|