| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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: |
|
|
14988
|
Wed Oct 23 11:14:21 2019 |
gautam | Update | ASC | PRMI ASC with QPD signals normalized. | Attachment #1 - comparison
of the POP QPD PIT and YAW output signal
spectra with and without them being |
|
|
14987
|
Wed Oct 23 11:11:01 2019 |
gautam | Update | ALS | EX uPDH electronics checkout | The closest thing I can think of is here.
|
|
|
14986
|
Wed Oct 23 10:23:26 2019 |
rana | Update | ALS | EX uPDH electronics checkout | During our EX AM/PM setups, I don't
think we bumped the PDH gain knob (and I
hope that the knob was locked). Possible |
|
|
14985
|
Tue Oct 22 17:35:30 2019 |
gautam | Update | ASC | PRMI ASC - first pass | I made a change to the c1ass model to normalize
the PIT and YAW POP QPD outputs by the SUM
channel. A saturation block is used to prevent |
|
|
14984
|
Tue Oct 22 15:32:15 2019 |
gautam | Update | ALS | EX uPDH electronics checkout | Summary:
The EX PDH setup had what I thought
was insufficient phase and gain margins. |
|
|
14983
|
Tue Oct 22 00:52:27 2019 |
gautam | Update | LSC | Locking updates |
Transition of arms from POX/POY
to CARM/DARM was much smoother today - a
change was made at the EX PDH setup, see |
|
|
14982
|
Mon Oct 21 16:02:21 2019 |
gautam | Update | SUS | ETMX over the weekend | Looking at the sensor and oplev trends
over the weekend, there was only one event
where the optic seems to have been macroscopically |
|
|
14981
|
Mon Oct 21 12:25:46 2019 |
gautam | Update | ALS | DFD electronics checkout | Summary:
There are no unexpected red-flags
in the performance of the DFD electronics. |
|
|
14980
|
Mon Oct 21 11:44:19 2019 |
gautam | Update | safety | Interlock reconnected to Innolight controller | We also took this opportunity to re-connect
the interlock to the Innolight controller
(after it was disconnected for diagnosing |
|
|
14979
|
Fri Oct 18 20:21:33 2019 |
shruti | Update | ALS | AM measurement attempt at X end | [Shruti, Rana]
- At the X end, we set up the network
analyzer to begin measurement of the AM transfer |
|
|
14978
|
Fri Oct 18 18:13:55 2019 |
Koji | Update | safety | Laser interlock looks OK | I've checked the state of the laser
interlock switch and everything looked normal. |
|
|
14977
|
Fri Oct 18 17:35:07 2019 |
gautam | Update | SUS | ETMX sat box disconnected | Koji suggested systematic investigation
of the ETMX suspension electronics. The tests
to be done are: |
|
|
14976
|
Thu Oct 17 16:49:53 2019 |
gautam | Update | ASC | PRMI ASC - first pass | I tried implementing a basic PRMI ASC using
the POP QPD as a sensor. The POP22
buildup RMS is reduced by a factor of a few. |
|
|
14975
|
Thu Oct 17 12:34:51 2019 |
gautam | Update | General | Daytime wishlist | Some ideas that would help increase the
locking duty-cycle in the short term.
Seismometer investigation |
|
|
14974
|
Thu Oct 17 11:19:28 2019 |
gautam | Update | LSC | Locking activity last night |
Tuning the MICH-->PRM
output matrix element
Locked
the PRMI with the carrier field resonant |
|
|
14973
|
Wed Oct 16 11:42:17 2019 |
gautam | Update | LSC | Poor separation of PRCL/MICH in 3f signals | Summary:
There is poor separation
of the PRCL and MICH length error signals |
|
|
14972
|
Tue Oct 15 17:22:26 2019 |
gautam | Update | General | Workstation computers back on UPS | Batteries + power cables replaced, and
computers back on UPS from today ~3pm.
|
|
|
14971
|
Tue Oct 15 17:19:38 2019 |
Koji | Update | General | Wednesday cleaning work | [Liz, Gautam, Chub, Jordan, Koji]
We removed a significant
amount of e-waste from the lab. |
|
|
14970
|
Mon Oct 14 17:32:28 2019 |
Koji | Update | CDS | Portal Elog entry for the recent CM servo board tests | Updated Circuit Diagram and photos:
https://dcc.ligo.org/D1500308-v2
- (1) and (6) of the diagram: |
|
|
14969
|
Mon Oct 14 17:24:28 2019 |
gautam | Update | General | Workstation computers taken off UPS (temporarily) | The UPS is now incessantly beeping. I cannot
handle this constant sound so I shut down
all the control room workstations and moved |
|
|
14968
|
Mon Oct 14 16:34:42 2019 |
Koji | Update | CDS | CM servo board testing | Input referred offsets on the IN1/IN2 were
tested with different gain settings. The
two inputs were plugged by the 50 ohm terminators. |
|
|
14967
|
Mon Oct 14 16:25:03 2019 |
Koji | Update | CDS | CM servo board testing | The output stage (and AO GAIN stage) of
the MC board was modelled. The transfer function
was measured with the injection from EXC |
|