ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
16950
|
Mon Jun 27 13:25:50 2022 |
Cici | Update | General | Characterizing the Transfer Loop | [Deeksha, Cici]
We first took data of a simple
low pass filter, and attempted to perform |
|
|
16951
|
Mon Jun 27 13:39:40 2022 |
Deeksha | Update | Electronics | Setting up the MokuLab | [Cici, Deeksha]
On Friday Cici and I set up the
Mokulab to take readings of our loop. The |
|
|
16952
|
Mon Jun 27 18:54:27 2022 |
yuta | Update | LSC | Modulation depths measurement using Yarm cavity scan | [Yehonathan, Yuta]
EDITED
by YM on 22:11 June 27, 2022 to correct for |
|
|
16953
|
Tue Jun 28 09:03:58 2022 |
JC | Update | General | Organizing and Cleaning | The plan for
the tools in 40m
As of right now, there are 4 tool |
|
|
16954
|
Tue Jun 28 14:24:23 2022 |
yuta | Update | BHD | BHD DC PD signals now also sent to c1lsc to circumvent IPC error | [JC, Yuta]
To circumvent IPC error sending
BHD DC PD signals from c1sus2 to c1lsc, DB9 |
|
|
16955
|
Tue Jun 28 16:26:58 2022 |
Cici | Summary | General | Vector fitting open loop transfer function/Audio cancellation of optical table enclosure | [Deeksha, Cici]
We attempted to use vectfit to
fit our earlier transfer function data, and |
|
|
16956
|
Tue Jun 28 16:59:35 2022 |
Paco | Summary | ALS | ALS beat allan deviation (XARM) | [Paco]
I took ~ 7 minutes of XALS beatnote
data with the XAUX laser locked to the XARM |
|
|
16957
|
Tue Jun 28 17:07:47 2022 |
Anchal | Update | Calibration | Added Beatnote channels in demodulation of c1cal | I added today demodulation of C1:LSC-BEATX/Y_FINE_I/Q
in the c1cal demodulation where different
degrees of freedom can be dithered. For McCal |
|
|
16958
|
Tue Jun 28 18:19:09 2022 |
Tomislav | Update | Electronics | Electronics noise | I measured electronics noise of WFSs and
QPD (of the WFS/QPD, whitening, ADC...) by
closing PSL and measuring the error signal. |
|
|
16959
|
Tue Jun 28 18:53:16 2022 |
rana | Summary | ALS | ALS beat allan deviation (XARM) | what's the reasoning behind using df/f_beat
instead of df/f_laser ?
|
|
|
16960
|
Tue Jun 28 22:27:11 2022 |
Yehonathan | Update | BHD | Measurement of input and output electronics noise | {Yuta, Yehonathan}
For MICH noise budgeting we measure
the input electronics noise which includes |
|
|
16961
|
Tue Jun 28 23:10:34 2022 |
Yehonathan | Update | BHD | Measurement of AS55 demod board conversion factor | {Yuta, Yehonathan}
We measured the AS55 demod board
conversion from the amplitude of a 55MHz |
|
|
16962
|
Wed Jun 29 14:28:06 2022 |
Paco | Summary | ALS | ALS beat allan deviation (XARM) | I guess it didn't make sense since
f_beat can be arbitrarily moved, but the
beat is taken around the PSL freq ~ 281.73 |
|
|
16963
|
Wed Jun 29 18:53:38 2022 |
rana | Update | Electronics | Electronics noise | this is just the CDS error signal, but
is not the electronics noise. You have to
go into the lab and measure the noise at |
|
|
16964
|
Thu Jun 30 17:19:55 2022 |
Deeksha | Summary | Electronics | Measured Transfer Functions of the Control Loop, Servo (OLTF); got Vectfit working | [Cici, Deeksha]
We were able to greatly improve
the quality of our readings by changing the |
|
|
16965
|
Thu Jun 30 18:06:22 2022 |
Paco | Update | ALS | Optimum ALS recovery - part I | [Paco]
In the morning I took some time
to align the AUX beams in the XEND table. |
|
|
16966
|
Thu Jun 30 19:04:55 2022 |
rana | Summary | PSL | PSL HEPA: How what when why | For the PSL HEPA, we wanted it to remain
at full speed during the vent, when anyone
is working on the PSL, or when there is a |
|
|
16967
|
Thu Jun 30 19:24:24 2022 |
rana | Summary | PEM | effect of nearby CES construction | For the proposed construction in the NW
corner of the CES building (near the 40m
BS chamber), they did a simulated construction |
|
|
16968
|
Fri Jul 1 08:50:48 2022 |
yuta | Summary | LSC | FPMI with REFL/AS55 trial | [Anchal, Paco, Yuta]
We tried to lock FPMI with REFL55
and AS55 this week, but no success yet. |
|
|
16969
|
Fri Jul 1 12:49:52 2022 |
Koji | Update | IOO | MC2 seemed misaligned / fixed | I found the IMC was largely misaligned
and was not locking. The WFS feedback signals
were saturated and MC2 was still largely |
|
|
16972
|
Tue Jul 5 20:05:06 2022 |
Tomislav | Update | Electronics | Whitening electronics noise | For whitening electronics noise for WFS1,
I get (attachment). This doesn't seem
right, right? |
|
|
16973
|
Wed Jul 6 15:28:18 2022 |
Tega | Update | SUS | Output matrix diagonalisation : F2P coil balancing | git repo : https://git.ligo.org/40m/scripts/-/tree/main/SUS/OutMatCalc
local dir: |
|
|
16974
|
Wed Jul 6 18:51:20 2022 |
Deeksha | Update | Electronics | Measuring the Transfer Function of the PZT | Yesterday, we set up the loop to measure
the PZT of the transfer function - the MokuLab
sends an excitation (note - a swept sine |
|
|
16975
|
Wed Jul 6 19:58:16 2022 |
Paco | Summary | NoiseBudget | XARM noise budget | [Anchal, Paco, Rana]
We locked the XARM
using POX11 |
|
|
16976
|
Wed Jul 6 22:40:03 2022 |
Tega | Summary | CDS | Use osem variance to turn off SUS damping instead of coil outputs | I updated the database
files for the 7 BHD optics to separate
the OSEM variance trigger and the LATCH_OFF |
|
|
16977
|
Thu Jul 7 18:18:19 2022 |
yuta | Update | LSC | Actuator calibration of ETMX and ETMX | (This is a
complete restore of elog 40m/16970
from July 5, 2022 at 14:34) |
|
|
16978
|
Thu Jul 7 18:22:12 2022 |
yuta | Update | LSC | Actuator calibration of MC2 using Yarm | (This is also
a restore of elog 40m/16971
from Jul 5, 2022 at 17:36) |
|
|
16979
|
Thu Jul 7 21:25:48 2022 |
Tega | Summary | CDS | Use osem variance to turn off SUS damping instead of coil outputs | [Anchal, Tega]
Implemented
ramp down of coil bias voltage when |
|
|
16980
|
Fri Jul 8 14:03:33 2022 |
JC | HowTo | VAC | Vacuum Preparation for Power Shutdown | [Koji, JC]
Koji and I have prepared the vacuum
system for the power outage on Saturday. |
|
|
16981
|
Fri Jul 8 16:18:35 2022 |
rana | Update | LSC | Actuator calibration of MC2 using Yarm | although I know that Yuta knows this, I
will just put this here to be clear: the
NNN/f^2 calibration is only accurate abouve |
|
|
16982
|
Fri Jul 8 23:10:04 2022 |
Koji | Summary | General | July 9th, 2022 Power Outage Prep | The 40m team worked on the power outage
preparation. The detailed is summarized on
this wiki page. We will still be able to |
|
|
16983
|
Mon Jul 11 11:16:45 2022 |
JC | Summary | Electronics | Startup after Shutdown | [Paco, Yehonathan, JC]
We began starting up all the electronics
this morning beginning in the Y-end. After |
|
|
16984
|
Mon Jul 11 11:56:40 2022 |
Yehonathan | Update | BHD | MICH AS55 noise budget | I calculated a noise budget for the MICH
using AS55 as a sensor. The calculation includes
closed-loop TF calculations. |
|
|
16985
|
Mon Jul 11 15:26:12 2022 |
JC | HowTo | VAC | Startup after Power Outage | [Koji, Jc]
Koji and I began starting that
Vacuum system up. |
|
|
16986
|
Mon Jul 11 17:25:43 2022 |
Tega | Update | VAC | fixed obsolete reference bug in serial_XGS600 service | Koji noticed that the FRG sensors were
not updating due to reference to an
obsolete modbusIOC_XGS service, which was |
|
|
16987
|
Mon Jul 11 17:41:52 2022 |
Koji | HowTo | VAC | Startup after Power Outage | - Once the FRG gauge readings are back
(see next elog by Tega), I could open V1
to pump down the main vacuum manifold. |
|
|
16988
|
Mon Jul 11 19:29:23 2022 |
Paco | Summary | General | Finalizing recovery -- timing issues, cds, MC1 | [Yuta, Koji, Paco]
Restarting
CDS
We were having |
|
|
16989
|
Tue Jul 12 09:14:50 2022 |
rana | Update | BHD | MICH AS55 noise budget | Looking good:
I think the notches you
see in he measured noise are a clue as to |
|
|
16990
|
Tue Jul 12 09:25:09 2022 |
rana | Update | IOO | IMC WFS | MC WFS
Demod board needs some attention. |
|
|
16991
|
Tue Jul 12 13:59:12 2022 |
rana | Summary | Computers | process monitoring: Monit | I've installed Monit
on megatron and nodus just now, and will
set it up to monitor some of our common processes. |
|
|
16992
|
Tue Jul 12 14:56:17 2022 |
Tomislav | Summary | Electronics | Electronics noise measurements | [Paco, Tomislav]
We measured the electronics noise
of the demodulation board, whitening board, |
23x |
|
16993
|
Tue Jul 12 18:35:31 2022 |
Cici Hanna | Summary | General | Finding Zeros/Poles With Vectfit | Am still working on using vectfit to find
my zeros/poles of a transfer function - now
have a more specific project in mind, which |
|
|
16994
|
Tue Jul 12 19:46:54 2022 |
Paco | Summary | ALS | How (not) to take NPRO PZT transfer function | [Paco, Deeksha, rana]
Quick elog for this evening:
Rana disabled MC servo |
|
|
16995
|
Wed Jul 13 07:16:48 2022 |
JC | Update | Electronics | Checking Sorensen Power Supplies | [JC]
I went around 40m picking up any
Sorensens that were laying around to test |
|
|
16996
|
Wed Jul 13 10:54:39 2022 |
Yehonathan | Update | BHD | MICH AS55 noise budget | I fixed some mistakes in the budget:
1. The BS pendulum resonance was
corrected from 0.8Hz to 1Hz |
|
|
16997
|
Wed Jul 13 12:49:25 2022 |
Paco | Summary | SUS | SUS frozen | [Paco, JC, Yuta]
This morning, while investigating
the source of a burning smell, we turned |
|
|
16998
|
Wed Jul 13 13:26:44 2022 |
rana | Summary | Electronics | Electronics noise measurements | as I said to you yesterday, I
don't think image 2a shows the output
of the demod board. The output |
|
|
16999
|
Wed Jul 13 13:30:48 2022 |
Yehonathan | Update | BHD | add Laser RIN to MICH budget | the main laser noise coupling for a Michelson
is because of the RIN, not the frequency
noise. You can measure the RIN, in MC trans |
|
|
17000
|
Wed Jul 13 17:30:19 2022 |
Koji | Update | CDS | Too huge script_archive | I wanted to check the script archive to
see some old settings. I found that the script archive |
|
|
17001
|
Wed Jul 13 18:58:17 2022 |
Koji | Update | IOO | IMC suspecion | This is just my intuition but the IMC servo
seems not so optimized. I can increase the
servo gain by 6~10dB easily. And I couldn't |
|