| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
14093
|
Fri Jul 20 22:53:15 2018 |
Koji | Update | ASS | Attempt to resurrect Yarm ASS | [Koji Gautam]
We managed to realize stable
ASS configuration for Yarm. The transmission |
|
|
14095
|
Sat Jul 21 01:14:02 2018 |
gautam | Update | OMC | PZT Jena driver board check | [Aaron, gautam]
We did a quick check of this
board today. Main takeaways: |
|
|
14097
|
Sun Jul 22 14:01:07 2018 |
pooja | Update | Cameras | Developing neural networks on simulated video | Aim: To develop a neural
network that resolves mirror motion from |
|
|
14100
|
Tue Jul 24 06:11:50 2018 |
rana | Update | Cameras | Developing neural networks on simulated video | This looks like good progress. Instead
of fixed sines or random noise, you should
generate now a time series for the motion |
|
|
14101
|
Tue Jul 24 09:47:51 2018 |
gautam | Update | Cameras | Developing neural networks on simulated video | I was thinking a little more about the
way we are training the network for the current
topology - because the network has no recurrent |
|
|
14105
|
Thu Jul 26 01:52:01 2018 |
terra | Update | Thermal Compensation | heater work update | Just a quick update: over the past few
days we've taken (at least) 5 scans around
each peak [carrier - HOM3] at 9.4V/0.8A, |
|
|
14106
|
Thu Jul 26 15:11:18 2018 |
Steve | Update | General | Viewports & coating of 2001 | New optical quality BK-7 windows in 2001
[4 substrates ] AR coated R<0.75 % for
630-1064nm " |
|
|
14107
|
Fri Jul 27 02:30:51 2018 |
gautam | Update | General | Glitchy MC | Kevin and I saw some weird IMC / PEM BLRMS
behaviour today - see Attached screenshot.
Not sure what was happening with the IMC, |
|
|
14108
|
Fri Jul 27 10:48:57 2018 |
Steve | Update | SUS | BS oplev window | Yesterday I inspected this BS oplev viewport.
The heavy connector tube was shorting to
table so It was moved back towards the chamber. |
|
|
14109
|
Fri Jul 27 17:16:14 2018 |
Sandrine | Update | Thermal Compensation | Copied working scripts for mode spectroscopy into new directory (modeSpec) | The scripts: AGfast.py, make HDF5.py, plotSpec_marconi.py,
and SandrineFitv3.py were copied into the
new directory modeSpec. |
|
|
14111
|
Sat Jul 28 22:16:49 2018 |
John Martyn | Update | | Characterization of Transimpedance Amplifier | Kevin and I meaured the transfer function
of the photodiode circuit using the Jenne
laser and agilent in the 40m lab. The attached |
|
|
14112
|
Sun Jul 29 00:59:54 2018 |
Koji | Update | Electronics | Characterization of Transimpedance Amplifier | You have this measurement problem when
the IF bandwidth is larger than the measurement
frequency. I suspect the IF bandwidth is |
|
|
14113
|
Sun Jul 29 20:03:02 2018 |
rana | Update | PEM | Seismometer temp control | While Shruti is re-building Kira's
heater circuit, I looked up how to do one
of these (i.e. what does a real EE say about |
|
|
14114
|
Sun Jul 29 23:15:34 2018 |
pooja | Update | Cameras | Developing CNN | Aim: To develop a convolutional
neural network that resolves mirror motion |
|
|
14115
|
Mon Jul 30 11:05:44 2018 |
gautam | Update | SUS | IFO SUS wonky | When I came in this morning:
PMC was unlocked.
Seis
BLRMS were off scale.
ITMX OSEM |
|
|
14117
|
Mon Jul 30 16:11:54 2018 |
gautam | Update | SUS | Trillium interface box is broken | [koji,
steve, gautam] |
|
|
14118
|
Mon Jul 30 18:19:03 2018 |
Koji | Update | SUS | Trillium interface box was fixed and reinstalled | The trillium interface box was removed
from the rack.
The |
|
|
14119
|
Tue Jul 31 08:17:55 2018 |
Steve | Update | SUS | Trillium interface box was fixed,reinstalled & working |
|
|
|
14120
|
Tue Jul 31 22:50:18 2018 |
aaron | Update | OMC | OMC Expected Refl Signal | I learned a lot about lasers this week
from Siegman. Here are some plots that show
the expected reflectivity off of the OMC |
|
|
14124
|
Thu Aug 2 16:30:08 2018 |
Steve | Update | Treasure | time capsule location | I 've just found this time capsule
note from Nov. 26, 2000 by Kip Thorne:
LIGO will discover gravitational waves by |
|
|
14129
|
Fri Aug 3 15:53:25 2018 |
gautam | Update | SUS | Low noise bias path idea | Summary:
The idea we are going with to push
the coil driver noise contribution down is |
|
|
14130
|
Fri Aug 3 16:27:40 2018 |
rana | Update | SUS | Low noise bias path idea | Bah! Too complex. |
|
|
14131
|
Fri Aug 3 18:54:58 2018 |
gautam | Update | SUS | Glitchy MC1 | The wall StripTool indicated that the IMC
wasn't too happy when I came in today.
Specifically: |
|
|
14132
|
Fri Aug 3 19:02:11 2018 |
gautam | Update | ASS | X arm ASS recovery | [koji,
gautam]
After I effected the series resistance |
|
|
14133
|
Sun Aug 5 13:28:43 2018 |
gautam | Update | CDS | c1lsc flaky | Since the lab-wide
computer shutdown last Wednesday, all
the realtime models running on c1lsc have |
|
|
14134
|
Sun Aug 5 13:45:00 2018 |
gautam | Update | SUS | ETMX tripped | Independent from the problems the vertex
machine has been having (I think, unless
it's something happening over the shared |
|
|
14135
|
Sun Aug 5 15:43:50 2018 |
gautam | Update | SUS | Another low noise bias path idea | OK, how about this:
Attachment |
|
|
14136
|
Mon Aug 6 00:26:21 2018 |
gautam | Update | CDS | More CDS woes | I spent most of today fighting various
CDS errors.
I rebooted c1lsc around |
|
|
14137
|
Mon Aug 6 09:34:02 2018 |
Steve | Update | VAC | RGA scan at day 20 |
|
|
|
14139
|
Mon Aug 6 14:38:38 2018 |
gautam | Update | CDS | More CDS woes | Stability was short-lived it seems. When
I came in this morning, all models on c1lsc
were dead already, and now c1sus is also |
|
|
14140
|
Mon Aug 6 19:49:09 2018 |
gautam | Update | CDS | More CDS woes | I've left
the c1lsc frontend shutdown for now, |
|
|
14141
|
Mon Aug 6 20:41:10 2018 |
aaron | Update | DAQ | New DAC for the OMC | Gautam and I tested out the DAC that he
installed in the latter half of last week.
We confirmed that at least one of the channels |
|
|
14142
|
Tue Aug 7 11:30:46 2018 |
gautam | Update | CDS | More CDS woes | Overnight, all models on c1sus and c1ioo
seem to have had no stability issues, supporting
the hypothesis that timing issues stem from |
|
|
14143
|
Tue Aug 7 22:28:23 2018 |
gautam | Update | CDS | More CDS woes | I am starting the c1x04 model (IOP) on
c1lsc to see how it behaves overnight.
Well, there was apparently an immediate |
|
|
14144
|
Tue Aug 7 23:06:30 2018 |
Koji | Update | PSL | EOM measuement preparation | I was preparing for the aLIGO EOM measuement
to be carried out tomorrow afternoon.
I did a few modifications to the |
|
|
14145
|
Wed Aug 8 20:56:11 2018 |
Koji | Update | PSL | EOM measuement preparation | Rich and I worked on the EOM measurement.
After the measurement, the setup was reverted
to the nominal state |
|
|
14146
|
Wed Aug 8 23:03:42 2018 |
gautam | Update | CDS | c1lsc model started | As part of this slow but systematic debugging,
I am turning on the c1lsc model overnight
to see if the model crashes return. |
|
|
14147
|
Wed Aug 8 23:06:59 2018 |
gautam | Update | SUS | Another low noise bias path idea | Today while Rich Abbott was here, Koji
and I had a brief discussion with him about
the HV amplifier idea for the coil driver |
|
|
14148
|
Thu Aug 9 02:12:13 2018 |
gautam | Update | COC | South East or West? | Summary:
For operating the SRC in the "Signal-Recycled"
tuning, the SRC macroscopic length needs |
|
|
14149
|
Thu Aug 9 12:31:13 2018 |
gautam | Update | CDS | CDS status update | The model seems to have run without issues
overnight. Not completely related, but the
MC1 shadow sensor signals also don't |
|
|
14150
|
Thu Aug 9 12:40:14 2018 |
gautam | Update | SUS | ETMX trip follow-up | A brief follow-up on this since we discussed
this at the meeting yesterday: the attached
DV screenshot shows the full 2k data for |
|
|
14151
|
Thu Aug 9 22:50:13 2018 |
gautam | Update | CDS | AlignSoft script modified | After this
work of increasing the series resistance
on ETMX, there have been numerous occassions |
|
|
14152
|
Fri Aug 10 01:10:56 2018 |
gautam | Update | LSC | Some vertex locking restored | For
the first time after the whirlwind vent, |
|
|
14156
|
Mon Aug 13 09:56:23 2018 |
Steve | Update | SUS | ETMX trip follow-up | Here is an other big one
|
|
|
14157
|
Mon Aug 13 11:44:32 2018 |
gautam | Update | Computer Scripts / Programs | Patch updates on nodus | Larry W said that some security issues
were flagged on nodus. So I ran
|
|
|
14159
|
Mon Aug 13 20:21:10 2018 |
aaron | Update | OMC | New DAC for the OMC | [aaron, gautam]
We finished up making the new c1omc
model (screenshot attached). |
|
|
14160
|
Tue Aug 14 00:27:55 2018 |
gautam | Update | LSC | Locking prep | In preparation for attempting some DRMI
locking, I did the following:
Slow machine reboots for |
|
|
14161
|
Tue Aug 14 00:50:32 2018 |
gautam | Update | ASS | X arm ASS still not quite right? | While working on the single arm alignment,
I noticed that today, i was able to get the
X arm transmission back to ~1.22, and the |
|
|
14162
|
Tue Aug 14 02:01:12 2018 |
gautam | Update | LSC | DRMI locking - partial success | After tweaking the AS55 demod phase, SRM
alignment, triggering settings, I got a few
brief |
|
|
14163
|
Tue Aug 14 23:14:24 2018 |
aaron | Update | OMC | OMC scanning/aligning script | I made a script to scan the OMC length
at each setpoint for the two TTs steering
into the OMC. It is currently located on |
|