ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
10413
|
Wed Aug 20 04:09:21 2014 |
ericq | Update | Green Locking | Xarm Green PDH | I've made
a whole bunch of measurements on the Xarm
green situation.
TL;DRs:
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10414
|
Wed Aug 20 15:31:27 2014 |
ericq | Update | COC | Arm Loss Investigations Continue | [ericq, Gabriele]
Summary: After today's meeting, Gabriele
and I looked into the arm loss situation, |
|
|
10415
|
Wed Aug 20 16:10:43 2014 |
ericq | Update | Green Locking | Xarm Green PDH | A MIST simulation tells me that the green
pdh horn-to-horn displacement is about 1.2nm,
or ~18kHz. I used this, along with the scope |
|
|
10416
|
Wed Aug 20 18:05:18 2014 |
Jenne | Update | Green Locking | Yarm Green PDH - requirement |
I calibrated the control signal
from Volts to Hz using the rough PZT calibration |
|
|
10417
|
Wed Aug 20 21:09:16 2014 |
ericq | Update | Green Locking | Xarm Green PDH | I remeasured all of the noise spectra again
today, making sure the input attenuation
was as low as it could safely be. I also |
|
|
10418
|
Thu Aug 21 02:42:17 2014 |
rana, ericq | Configuration | Green Locking | Gain changes on Green Y PDH | [rana, ericq]
We spent time trying to relieve the
Yend green PDH of it troubles. |
|
|
10419
|
Thu Aug 21 15:07:48 2014 |
Steve | Update | VAC | RGA scan at day 197 |
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|
|
10420
|
Thu Aug 21 19:04:52 2014 |
ericq | Configuration | Green Locking | Gain changes on Green Y PDH | I found that the barrel of one the BNC
to BNC connectors used for getting the output
of the PDH servo box to the laser controller |
|
|
10421
|
Thu Aug 21 22:10:52 2014 |
rana | Summary | Computer Scripts / Programs | network movements | To help development of the data visualization
project, we've assigned the .101 and .102
IP to DataVis. This is being used by the |
|
|
10422
|
Fri Aug 22 03:55:45 2014 |
Jenne | Update | LSC | Xarm PDH fine, Yarm PDH/ALS needs work | [Rana, Jenne, EricQ]
We did several things tonight.
First, a list (so I can remember them all), |
|
|
10423
|
Fri Aug 22 13:51:00 2014 |
Jenne | Update | General | Updated game plan | |
|
|
10424
|
Fri Aug 22 15:11:55 2014 |
andres, nicolas | Summary | IOO | MC WFS activity | 1. Before doing anything, we centered the
IOO QPDs.
2. With the WFS enabled, we offloaded |
|
|
10425
|
Fri Aug 22 15:58:02 2014 |
Steve | Summary | IOO | MC WFS activity |
|
|
|
10426
|
Fri Aug 22 18:00:08 2014 |
jamie | Omnistructure | CDS | ubuntu12 awgstream installed | I installed awgstream-2.16.14 in /ligo/apps/ubuntu12.
As with all the ubuntu12 "packages",
you need to source the ubuntu12 ligoapps |
|
|
10427
|
Fri Aug 22 18:05:02 2014 |
Andres | Update | IMC | Upgrade of the IMC WFSs for the reflection | Upgrade of IMC Reflection Optical
Setup
Nick and I upgrade the IMC.
We move both WFSs and placed them facing |
|
|
10428
|
Mon Aug 25 09:56:21 2014 |
Steve | Update | IMC | IMC WFSs upgrade |
The Napa earth quake magnitude
6 did not have any effect on the suspensions. |
|
|
10429
|
Mon Aug 25 15:49:44 2014 |
Steve | Update | PSL | HEPA turned on | The PSL HEPA was off. It was turned on
and it is running at 30VAC now. |
|
|
10430
|
Tue Aug 26 23:16:49 2014 |
ericq | Configuration | Green Locking | Gain changes on Green Y PDH | Yesterday I measured the spectra
and OLTF of the Y-Arm green PDH, after the
LO touch-up and 60Hz hunt from last week. |
|
|
10431
|
Tue Aug 26 23:46:55 2014 |
ericq | Update | IMC | WFS tuneup | I decided to see what I could do
with the new WFS setup.
First, I adjusted the WFS digital |
|
|
10432
|
Wed Aug 27 09:12:47 2014 |
Koji | Update | IMC | WFS tuneup | I'm sure that the 1~3Hz motion comes from
the mirror motion, but not 100% sure what
is causing |
|
|
10433
|
Wed Aug 27 18:03:47 2014 |
ericq | Update | Green Locking | uPDH Box Checkup | Quick post of plots and data; I'll
fill in more detail tonight.
TL;DR: I pulled both green PDH boxes |
|
|
10434
|
Thu Aug 28 01:41:03 2014 |
ericq | Update | LSC | Phase Tracker UGF normalization | We want both the X and Y phase trackers
to have the same UGF, so that the X and Y
ALS signals are subject to the same phase |
|
|
10435
|
Thu Aug 28 08:31:16 2014 |
Steve | Update | General | one good day | |
|
|
10436
|
Thu Aug 28 11:02:53 2014 |
Steve | Update | Calibration-Repair | SR785 repair | SN 46,795 of 2003 is back. |
|
|
10437
|
Thu Aug 28 17:34:20 2014 |
ericq | Update | Green Locking | uPDH Box Checkup | I had noticed in the past, that the digital
control signal monitor for the X end would
saturate well before the ADC should saturate |
|
|
10438
|
Fri Aug 29 17:28:07 2014 |
rana | Update | Green Locking | uPDH Box Checkup |
|
|
|
10439
|
Fri Aug 29 23:53:35 2014 |
ericq | Update | Green Locking | uPDH Box Checkup | I had pulled out both X and Y servo boxes
for inspection, put the Y box back, soldered
in a missing op amp power capacitor on the |
|
|
10440
|
Tue Sep 2 16:22:24 2014 |
Jenne | Update | General | Game plan: 2 Sept | Slightly updated Game Plan. Mostly,
Q is continuing to check out the Xend PDH
box saturation, and I am thinking on what |
|
|
10441
|
Tue Sep 2 20:02:06 2014 |
ericq | Update | Green Locking | uPDH Box Checkup | I narrowed down the saturation point in
the X green PDH box to the preamp inside
the AD8336, but there is still no clear answer |
|
|
10442
|
Tue Sep 2 22:54:27 2014 |
Koji | Summary | LSC | phase tracker UGF | FYI and FMI
Phase tracker UGF is Q_AMP
* G * 2 PI / 360 where Q_AMP is |
|
|
10443
|
Wed Sep 3 00:17:22 2014 |
rana | Update | Green Locking | uPDH Box Checkup | What monitor point is being plotted here?
Or is it a scope probe output?
If this saturation is in the uPDH-X |
|
|
10444
|
Wed Sep 3 04:17:21 2014 |
Jenne | Update | LSC | Y green ALS (not PDH) needs investigation | Q put the X PDH box back, so that I could
try locking, and remember which end is up
after a week away. |
|
|
10445
|
Wed Sep 3 14:07:18 2014 |
rana | Configuration | General | netgpibdata is working again now |
|
|
|
10446
|
Wed Sep 3 18:42:43 2014 |
Jenne | Update | LSC | Green PDH box boosts | From EricQ's simulations reported in elog
10390, we want to transition from ALS |
|
|
10447
|
Wed Sep 3 20:38:40 2014 |
ericq | Update | Green Locking | uPDH Box Checkup | The traces were from the front panel output
BNCs, but the VGA preamp exhibited this asymmetric
saturation at its output. |
|
|
10448
|
Thu Sep 4 00:56:44 2014 |
Jenne | Update | LSC | Green PDH box boosts | Okay, went back to the drawing board with
Rana and Koji on PDH box stuff.
Currently (at least for the Yend), |
|
|
10449
|
Thu Sep 4 01:28:32 2014 |
ericq | Update | LSC | Recycling cavity lengths | Going off some discussion we had
at lunch today, here is my current knowledge
of the state of cavity lengths. |
|
|
10450
|
Thu Sep 4 03:12:55 2014 |
ericq | Update | LSC | Green PDH box boosts | Jenne made her board modifications, and
the measured TF agreed with the design. Alas,
the green would not lock to the arm in this |
|
|
10451
|
Thu Sep 4 10:10:23 2014 |
Koji | Update | LSC | Recycling cavity lengths | Com'on. This is just a 60ppm change of
the mod frequency from the nominal. How can
it change the recycling cav length by more |
|
|
10452
|
Thu Sep 4 16:45:10 2014 |
Jenne | Update | LSC | Green PDH box boosts | As EricQ mentioned in last night's elog,
the modifications were made to the Yend (SN
17) uPDH board. |
|
|
10453
|
Thu Sep 4 18:16:20 2014 |
ericq | Update | LSC | Recycling cavity lengths | Koji correctly points out that I naïvely
overlooked various factors. With a similar
analysis to the wiki page, I get: |
|
|
10454
|
Thu Sep 4 18:30:13 2014 |
Gabriele | Summary | ASC | Optimal Gouy phase for POP QPD | Jenne asked me to simulate the signals
on POP QPD when moving different mirrors,
as a function of the Gouy phase where the |
|
|
10455
|
Fri Sep 5 00:56:00 2014 |
rana | Summary | Optical Levers | ITM OLs recentered: violations found | I re-centered the ITMX & ITMY Optical
lever beams today since they were off. First
I aligned the beam into the vacuum so that |
|
|
10456
|
Fri Sep 5 03:36:00 2014 |
rana | Update | Computer Scripts / Programs | martian wireless tweak | I changed the Martian wireless router
to use channel 10 instead of something random
(as it was). Using the Android app 'Wifi |
|
|
10457
|
Fri Sep 5 04:07:44 2014 |
ericq | Update | Green Locking | X end uPDH Box Replaced | Just a quick note, plots and data will
come tomorrow:
I grabbed an unused uPDH board from |
|
|
10458
|
Fri Sep 5 05:32:57 2014 |
Jenne | Update | LSC | Green PDH box boosts | [Rana, Jenne, EricQ]
* Too much gain overall on Yend box,
needed attenuator on output to get lock. |
|
|
10459
|
Fri Sep 5 15:28:38 2014 |
Steve | Update | SUS | HeNe laser test preparation | The SRM qpd was moved to accommodate the
HeNe laser qualification test for LIGO Oplev
use. |
|
|
10460
|
Fri Sep 5 16:13:00 2014 |
ericq | Update | Green Locking | new X Green PDH measurements | I measured the noise spectra and
loop TF of the green PDH with the newly stuffed
board. Unfortunately, I never took the noise |
6x |
|
10461
|
Fri Sep 5 16:25:36 2014 |
Steve | Update | SUS | center ITMY oplev |
|
|
|
10462
|
Fri Sep 5 21:13:57 2014 |
Jenne | Update | LSC | Green PDH out of loop | I locked the arms with IR, and measured
the beatnote spectra to get the out of loop
noise for the PDH boxes. |
|