ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
17809
|
Thu Aug 24 13:10:17 2023 |
Murtaza | Summary | SUS | ETMX Testing | Koji suggested going through the following
steps to check the ETMX suspension:
1. Do a free swing test to obtain |
|
17816
|
Wed Aug 30 17:40:31 2023 |
Murtaza | Update | SUS | ETMX Testing | Update to 17809.
The free swing test for ETMX took quite some
time, here's a brief summary of what |
   |
17831
|
Thu Sep 7 16:25:01 2023 |
Murtaza | Update | SUS | ETMX Testing | COIL
BALANCING FOR ETMX |
   |
17870
|
Fri Sep 22 19:31:24 2023 |
Koji | Update | SUS | Fixed IMC/IFO alignment screens | Fixed IMC/IFO alignment screens |
 |
17875
|
Wed Sep 27 14:01:11 2023 |
yuta | Update | SUS | Whitening/dewhitening check at Yend | [Paco, Yuta]
We checked whitening and dewhitening |
    |
17876
|
Wed Sep 27 21:11:36 2023 |
yuta | Update | SUS | Checking suspension damping loop polarity conventions | [Paco, Yuta]
We checked the polarity of suspension |
|
17877
|
Thu Sep 28 11:27:24 2023 |
Radhika | Update | SUS | PRM/SRM damping/alignment | PRM/SRM OSEM input
calibration
- I realized |
 |
17878
|
Thu Sep 28 11:30:13 2023 |
yuta | Update | SUS | Checking suspension damping loop polarity conventions | To further homogenize the suspensions,
we did the following changes.
- Turned on DECIMATION in |
|
17883
|
Wed Oct 4 10:36:03 2023 |
Murtaza | Update | SUS | Small Optic Suspension Simulation |
The triple suspensions (mode cleaners:
PRM, SRM) at the Livingston site have measured |
 |
17886
|
Thu Oct 5 13:29:58 2023 |
yuta | Update | SUS | Actuator calibrations after vertex coil driver upgrade | We calibrated actuators for
the first time after the vertex coil driver
upgrade. |
9x |
17894
|
Tue Oct 10 17:15:54 2023 |
Murtaza | Update | SUS | Post-Vertex Coil Driver Upgrade Suspension Calibration | Post the vertex coil driver upgrade, we
need to make sure everything downstream is
working correctly. Starting with checking |
18x |
17899
|
Fri Oct 13 08:42:14 2023 |
murtaza | Update | SUS | OPLEV Whitening Board Missing (ETMX) | [Yuta, Paco, Murtaza]
[WIP]
Chasing the excess noise in TRX, |
6x |
17905
|
Wed Oct 18 12:29:19 2023 |
Paco | Update | SUS | OPLEV Whitening Board Fixed and installed (ETMX) | [Murtaza, Paco, Radhika]
We got some LT1128s from downs
(Dean) to get this board up and running again. |
   |
17918
|
Tue Oct 24 18:19:44 2023 |
yuta | Update | SUS | Actuator calibrations of BHD optics | [Begüm, Vittoria, Yuta]
We calibrated actuators for |
   |
17936
|
Mon Oct 30 18:04:46 2023 |
Paco | Update | SUS | BS Oplev check | I measured the Oplev PIT/YAW OLTFs and
adjusted the gains to get 0.1 to ~ 4 Hz feedback
as is recommended |
  |
17939
|
Tue Oct 31 16:25:29 2023 |
Koji | Update | SUS | ETMX POS unstable when misaligned | I noticed that there was an oscillating
spot on the ITMX face camera image. I tracked
the source down and found it was the motion |
|
17940
|
Tue Oct 31 17:27:09 2023 |
Koji | Update | SUS | ETMX POS unstable when misaligned | [Koji Paco]
We decided to invert the signs
of the misalignment offset for ETMX to see |
 |
17941
|
Tue Oct 31 17:27:27 2023 |
Paco | Update | SUS | ETMX software watchdog | [Koji, Paco, Yuta]
We implemented the ETMX software watchdog
"level 1", meaning the logic disables |
|
17948
|
Wed Nov 1 18:52:28 2023 |
Koji | Update | SUS | c1auxey1 confusion | [Koji, Yuta]
Yuta was working on the watchdog
unification for all the suspensions. He reached |
|
17949
|
Wed Nov 1 19:10:17 2023 |
yuta | Summary | SUS | Software watchdog implemented in BHD optics, and modified other ones | [Koji, Yuta]
We
implemented software watchdog for BHD optics. |
|
17950
|
Wed Nov 1 19:13:48 2023 |
Koji | Update | SUS | SUS medm screen update | We noticed that the alignment offset indicator
of the suspension screen only responded to
the ON/OFF switches. It was the source of |
|
17953
|
Thu Nov 2 14:18:04 2023 |
yuta | Summary | SUS | New MEDM screens and misalignment scheme in the era of software watchdogs | New
watchdog and suspension summary MEDM screens
were made, and IFO_ALIGN screen was updated. |
  |
17965
|
Tue Nov 7 16:43:49 2023 |
yuta | Summary | SUS | Untripping software watchdog | I made a script to untrip software watchdogs.
/opt/rtcds/caltech/c1/Git/40m/scripts/SUS/untripSoftWatchdog.py
|
|
17980
|
Wed Nov 15 17:37:17 2023 |
Koji | Update | SUS | PRM SUS UL PD not responding | Radhika reported that the PRM UL OSEM PD
is not responding. This PD has been identified
to have a shorting problem, but the short |
|
6844
|
Thu Jun 21 09:01:18 2012 |
steve | Update | STACIS | the resurrection of STACIS -surf | There is a small wood cabinet under the
south end flow bench, labeled STACIS.
Unit is complete with extension cards |
|
6882
|
Wed Jun 27 14:18:30 2012 |
Yaakov | Summary | STACIS | First week summary | The beginning of my first week was spent
at various orientations and safety meetings,
some for general SURF and some more specific |
|
6905
|
Mon Jul 2 23:08:38 2012 |
Yaakov | Update | STACIS | Turning on STACIS | This past Friday I swapped out a burnt
resistor on the spare STACIS unit I'm working
with and powered it up. Here's the setup: |
    |
6908
|
Tue Jul 3 18:58:14 2012 |
Yaakov | Update | STACIS | More transfer functions and netGPIB status | I'm still having issues with the STACIS
oscillating uncontrollably with the slightest
extra vibration, but with some more added |
  |
6963
|
Wed Jul 11 14:27:29 2012 |
Yaakov | Summary | STACIS | Current STACIS Status | The X and Y directions in the STACIS still
both oscillate uncontrollably in closed loop,
so I'll be doing my testing in Z for now. |
    |
6969
|
Thu Jul 12 15:43:07 2012 |
Yaakov | Update | STACIS | New input point, using accelerometers for feedback | Here's a picture of where I am now
inputting signals into the STACIS with the
accelerometers (the orange and blue wires): |
 |
6988
|
Wed Jul 18 13:53:34 2012 |
Yaakov | Update | STACIS | Weekly update | I have been working on substituting the
internal geophones in the STACIS with accelerometers,
and this week specifically I have been trying |
 |
7027
|
Wed Jul 25 12:00:21 2012 |
Yaakov | Update | STACIS | Weekly update | The past few days I've been working on
making a noise budget for the |
|
7040
|
Thu Jul 26 16:08:59 2012 |
Yaakov | Update | STACIS | Noise plot update | I have a tentative noise plot for the STACIS
that includes accelerometer noise, geophone
noise, and platform motion with the STACIS |
   |
7053
|
Mon Jul 30 17:24:45 2012 |
Yaakov | Update | STACIS | Revised sensor noise plot; dead PZT | The geophone noise in my last eLog was
taken before
any amplification of the signal, but |
  |
7054
|
Mon Jul 30 22:52:51 2012 |
Yaakov | Update | STACIS | Geophone calibration | Tonight I looked at the signal from a geophone
and accelerometer side by side, in order
to see if they show the same ground motion |
7x |
7058
|
Tue Jul 31 15:24:53 2012 |
Yaakov | Update | STACIS | Open loop gains and block diagram | First, a quick note on the PZT I thought
I killed- it was most likely something in
the high voltage amplifier that broke, since |
    |
7061
|
Tue Jul 31 19:34:55 2012 |
Koji | Update | STACIS | Open loop gains and block diagram | With your definition of the open loop gain,
G=+1 is the condition to have singularity
in a closed loop transfer function 1/(1-G). |
|
7068
|
Wed Aug 1 11:54:59 2012 |
Yaakov | Summary | STACIS | Geophone calibration and open loop gains | This week I've looked into finding an accurate
sensitivity for the geophones in the STACIS.
I found that when placing a geophone and |
|
7109
|
Tue Aug 7 21:34:50 2012 |
Yaakov | Update | STACIS | More noise data | Yesterday I plugged the geophone and
accelerometer output into the ADC, rather
than the SR785, so I could collect for longer |
 |
7112
|
Tue Aug 7 23:33:44 2012 |
rana | Update | STACIS | More noise data | Looks like you're just measuring the ADC
noise. You should add ADC noise to your plot.
To compare the geophones with the accelerometers, |
|
7118
|
Wed Aug 8 11:47:52 2012 |
Yaakov | Summary | STACIS | Weekly summary | As Rana pointed out (http://nodus.ligo.caltech.edu:8080/40m/7112),
the geophone/accelerometer noise lines from
my last eLog (http://nodus.ligo.caltech.edu:8080/40m/7109) |
  |
7148
|
Fri Aug 10 18:11:55 2012 |
Yaakov | Update | STACIS | Corrected noise budget, plan for external actuation | I hope you're not all tired of the STACIs
noise budgets, because I have another one!
Here, the main difference is my modeling |
6x |
7166
|
Mon Aug 13 21:47:30 2012 |
Yaakov | Update | STACIS | Two changes to STACIS noise budget | In eLog 7148 (http://nodus.ligo.caltech.edu:8080/40m/7148),
Koji pointed out that the op-amp and SR560 noise values |
  |
7190
|
Wed Aug 15 11:40:15 2012 |
Yaakov | Summary | STACIS | Weekly Summary | This week I've been focusing mainly on
two things: 1) Designing a port for the STACIS
that will allow external actuation and/or |
|
7210
|
Thu Aug 16 20:18:39 2012 |
Yaakov | Update | STACIS | Input for feedforward/feedback in the STACIS | Below is the bottom view of the geophone
preamplifier and controller for the STACIS.
It slides into the upper part of the STACIS, |
6x |
7231
|
Sun Aug 19 19:56:20 2012 |
Yaakov | Update | STACIS | STACIS signal box made | I made the signal box as described in eLog
7210. It adds the geophone signal and |
  |
7258
|
Thu Aug 23 15:42:48 2012 |
rana | Update | STACIS | STACIS signal box made |
I found this
entry in the old 40m ilog which |
|
560
|
Tue Jun 24 22:43:23 2008 |
rana | Summary | SEI | Stack TF | |
|
1559
|
Thu May 7 23:34:59 2009 |
rob | Update | SEI | seisBLRMS already lost | Can't find hostname 'fb40m'
it only lasted a few hours |
|
1598
|
Mon May 18 02:18:17 2009 |
rana | Summary | SEI | Using STACIS w/ a good position sensor | [FONT=Verdana]WE turned off STACIS a few years
ago because we noticed that it was causing
noise below a few Hz and making
|
|