ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
15339
|
Wed May 20 18:45:22 2020 |
Hang | Update | BHD | BHD mode-matching study--corner plot & adjustment requirement | As Rana suggested, we present the
scattering plot of the AS path
mode matching for various variables. |
 |
15338
|
Tue May 19 15:39:04 2020 |
Yehonathan | Update | Loss Measurement | 40m Phase maps loss estimation | I have a serious concern about this low
angle scattering analysis:
Phase maps perturb the spatial |
|
15337
|
Tue May 19 15:24:06 2020 |
rana | Update | BHD | BHD mode-matching study | It would be good to have a corner
plot with all the distances/ RoCs. Also
perhaps a Jacobian |
|
15336
|
Mon May 18 18:00:16 2020 |
Hang | Update | BHD | BHD mode-matching study | [Jon, Tega, Hang]
We proposed a few BHD mode-matching telescope
designs and then preformed a few monte-carlo |
|
15335
|
Fri May 15 19:10:42 2020 |
gautam | Update | SUS | All watchdogs tripped, now restored | This
EQ in Nevada seems to have tripped all watchdogs.
ITMX was stuck. It was released, and all |
|
15334
|
Fri May 15 09:18:04 2020 |
Jon | Update | BHD | BHD telescope designs accounting for ASC | Hang and I have reanalyzed the BHD telescope
designs, with the goal of identifying
sufficiently non-degenerate locations for |
 |
15333
|
Thu May 14 19:00:43 2020 |
Yehonathan | Update | Loss Measurement | 40m Phase maps loss estimation | Perturbation theory:
The cavity modes |
|
15332
|
Thu May 14 12:21:56 2020 |
Yehonathan | Update | Loss Measurement | 40m Phase maps loss estimation | I finished calculating the X Arm loss using
first-order perturbation theory. I will post
the details of the calculation later. |
 |
15331
|
Thu May 14 00:47:55 2020 |
gautam | Summary | Computer Scripts / Programs | pcdev1 added to authorized keys on nodus | This is to facilitate the summary page
config fines to be pulled from nodus in a
scripted way, without being asked for authentication. |
|
15330
|
Thu May 14 00:21:03 2020 |
gautam | Update | LSC | CM board boosts | Summary:
I think the boosts that are currently
stuffed on the CM board are too |
 |
15329
|
Wed May 13 15:13:11 2020 |
Yehonathan | Update | Loss Measurement | 40m Phase maps loss estimation | Koji pointed out during the group meeting
that I should compensate for local tilt when
I move the beam around the mirror for calculating |
 |
15328
|
Tue May 12 22:47:49 2020 |
gautam | Update | LSC | Relative importance of losses in the arm and PRC | Yes, \eta_A is the (average) round-trip
loss for an arm cavity. I'd estimate
this is ~100ppm currently. I edited the original |
|
15327
|
Tue May 12 20:16:31 2020 |
Koji | Update | LSC | Relative importance of losses in the arm and PRC | Is \eta_A the roundtrip loss for an arm?
Thinking about the PRG=10 you saw:
- What's the current PR2/3 AR? |
|
15326
|
Tue May 12 18:16:17 2020 |
gautam | Update | LSC | Relative importance of losses in the arm and PRC | Attachment
#1 is meant to show |
|
15325
|
Tue May 12 17:51:25 2020 |
rana | Summary | Computer Scripts / Programs | updated LESS syntax highlight on nodus | apt install source-highlight
then modified bashrc to point to
/usr/share instead of /usr/bin |
|
15324
|
Mon May 11 00:12:34 2020 |
gautam | Update | LSC | RF only PRFPMI | Finally - Attachment
#1. This plot uses |
   |
15323
|
Sat May 9 17:01:08 2020 |
Yehonathan | Update | Loss Measurement | 40m Phase maps loss estimation | I took the phase maps of the 40m X arm
mirrors and calculated what is the loss of
a gaussian beam due to a single bounce. I |
   |
15322
|
Fri May 8 14:27:25 2020 |
Hang | Update | BHD | New SRC gouy phase | [Jon, Hang]
After updating the 40 m finesse
file to incorporate the new SRC length (and |
 |
15321
|
Thu May 7 10:58:06 2020 |
gautam | Update | ASC | IMC WFS | OK so the QPD segments are in the "+"
orientation when the 40m IMC WFS heads are
mounted at 45 deg. I thought "+" |
|
15320
|
Thu May 7 09:43:21 2020 |
rana | Update | ASC | IMC WFS | This
is the doc from Keita Kawabe on why the
WFS heads should be rotated. |
|
15319
|
Wed May 6 00:31:09 2020 |
gautam | Update | ALS | Optomechanics during CARM offset reduction | Summary:
The apparent increase in the ALS
noise (witnessed in-loop, e.g. |
 |
15318
|
Tue May 5 23:44:14 2020 |
gautam | Update | ASC | IMC WFS | Summary:
I've been thinking about the
IMC WFS. I want to repeat the sort of analysis |
 |
15317
|
Sat May 2 02:35:18 2020 |
Koji | Update | ALS | ASY M2 PZT damaged | Yes, we are supposed to have a few spare
PI PZTs. |
|
15316
|
Fri May 1 22:44:17 2020 |
gautam | Update | ALS | ASY M2 PZT damaged | I went to EY and saw that the HV power
supply was only putting out 50 V and had
hit the current limit of 10 mA (nominally, |
|
15315
|
Fri May 1 01:49:55 2020 |
gautam | Update | ALS | ASY commissioning | Summary:
It appears that the EY green steering
PZTs have somehow lost their bipolar actuation |
|
15314
|
Thu Apr 30 07:29:01 2020 |
Chub | Update | VAC | N2 delivered. | Hi All,
The new nitrogen cylinders were
delivered to the rack at the west entrance. |
|
15313
|
Fri Apr 24 00:26:59 2020 |
rana | Summary | PEM | L.A. EQ from Tuesday night | |
|
15312
|
Thu Apr 23 10:42:02 2020 |
rana | Update | PSL | FSS debugging attempts | I had set up the 4395 to do this automatically
a few years ago, but it looked
at the FSS/IMC instead. When the PCDRIVE |
|
15311
|
Thu Apr 23 09:52:02 2020 |
Jon | Update | Cameras | GigE w better NIR sensitivvity | Nice, and we should also permanently install
the camera server (c1cam)
which is still sitting on the electronics |
|
15310
|
Wed Apr 22 17:29:14 2020 |
gautam | Update | PSL | FSS debugging attempts | Summary:
On Monday, I hooked up an AG4395
to the PMC error point (using the active |
|
15309
|
Wed Apr 22 13:52:05 2020 |
gautam | Update | DetChar | Summary page revival | Covid 19 motivated me to revive the summary
pages. With Alex Urban's help, the infrastructure
was modernized, the wiki |
|
15308
|
Mon Apr 20 17:49:58 2020 |
gautam | Update | General | Some housekeeping |
Empty
N2 replaced.
Logged back into zita and started |
 |
15307
|
Sat Apr 18 14:57:44 2020 |
Yehonathan | Update | Loss Measurement | Arm transfer function measurement | Ok, now I understand my foolishness. It
should definitely be 1/sqrt(f^2+fp^2)
. |
|
15306
|
Sat Apr 18 13:32:31 2020 |
rana | Update | Cameras | GigE w better NIR sensitivvity | There's this
elog from Stephen about better 1064
sensitivity from Basler. We should consider |
|
15305
|
Thu Apr 16 21:13:20 2020 |
Jon | Update | BHD | BHD optics specifications | Summary
I've generated
specifications for the new BHD optics. This
includes the suspended relay mirrors as |
 |
15304
|
Wed Apr 15 15:15:17 2020 |
Chub | Update | VAC | nitrogen cylinders delivered | Four nitrogen cylinders replaced the empties
in the rack at the west entrance. Additionally,
Airgas will now deliver only once a week. |
|
15303
|
Tue Apr 14 23:50:06 2020 |
Koji | Update | General | 40m power glitch recovery | [Koji / Gautam (Remote)]
Lab
status |
|
15302
|
Mon Apr 13 16:51:49 2020 |
rana | Summary | DAQ | NODUS: rsyncd daemon / service set up | I just now modified the /etc/rsyncd.conf
file as per Dan Kozak's instructions.
The old conf file is still there with the |
|
15301
|
Mon Apr 13 15:28:07 2020 |
Koji | Update | General | Power Event and recovery | [Larry (on site), Koji
& Gautam (remote)]
Network recovery |
|
15300
|
Tue Apr 7 15:30:40 2020 |
Jon | Summary | NoiseBudget | 40m noise budget migrated to pygwinc | In the past year, pygwinc has expanded
to support not just fundamental noise calculations (e.g.,
quantum, thermal) but also any number of |
|
15299
|
Tue Apr 7 10:56:39 2020 |
Jon | Update | BHD | BHD front-end complication |
Quote:
|
|
15298
|
Mon Apr 6 16:46:40 2020 |
gautam | Update | ASC | POP angular FF filters trained and tested | I don't have a recent measurement of
the optical gain of this config so I can't
undo the loop, but in-loop performance doesn't |
|
15297
|
Mon Apr 6 12:26:07 2020 |
rana | Update | ASC | POP angular FF filters trained and tested | that's pretty great performance. maybe
you can also upload some code so that we
can do it later too - or maybe in the 40m |
|
15296
|
Fri Apr 3 17:15:53 2020 |
gautam | Update | ASC | POP angular FF filters trained and tested | Summary:
Using the data I collected yesterday,
the POP angular FF filters have been trained. |
    |
15295
|
Fri Apr 3 13:40:07 2020 |
Jon | Update | BHD | BHD front-end complication | I wanted to pass along a complication pointed
out by K. Thorne re: our plan to use Gen1
(old) Dolphin IPC cards in the new real-time |
|
15294
|
Fri Apr 3 12:09:53 2020 |
Jon | Update | CDS | C1AUXEY wiring + channel list |
Quote:
|
|
15293
|
Thu Apr 2 22:19:18 2020 |
Koji | Update | CDS | C1AUXEY wiring + channel list | We want to migrate the end shutter controls
from c1aux to the end acromags. Could you
include them to the list if not yet? |
|
15292
|
Thu Apr 2 16:31:33 2020 |
Jon | Update | CDS | C1AUXEY wiring + channel list |
Quote:
|
|
15291
|
Thu Apr 2 15:53:01 2020 |
gautam | Update | ASC | PRMI 1f locked for collecting feedforward data | This afternoon, I kept the PRM locked for
~1hour and then measured transfer functions
from the PRM angular actuators to the POP |
|
15290
|
Wed Apr 1 00:51:41 2020 |
gautam | Update | Wiener | Slightly improved MCL FF | Summary:
Retraining the MCL filters resulted
in a slight improvement in the performance. |
  |