| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
42
|
Wed Oct 31 23:55:17 2007 |
waldman | Other | OMC | QPD tests | The 4 QPDs for the OMC have been installed
in the 056 at the test setup. All 4 QPDs
work and have medm screens located under |
|
|
8358
|
Tue Mar 26 17:32:30 2013 |
Chloe | Update | | QPD/ECDL Progress | I built the summing/subtracting circuit
on the breadboard, and hooked this up with
one of the other QPDs I found (image of setup |
|
|
1928
|
Wed Aug 19 17:11:33 2009 |
Jenne | Update | IOO | QPDs aligned |
|
|
|
10206
|
Tue Jul 15 21:43:28 2014 |
Jenne | Update | LSC | QPDs back | I removed the dumps in front of the trans
QPDs. The Yend QPD needed re-normalization,
so I did that. |
|
|
12217
|
Mon Jun 27 15:47:17 2016 |
Steve | Update | General | QPR clean room gloves | I got some
QPR Nitrile gloves. They are LIGO approved.White
nitrile gloves are naturally anti-static- |
|
|
10993
|
Tue Feb 10 02:55:29 2015 |
Jenne | Configuration | Modern Control | Quacky filters | I discovered that somehow my Wiener filters
that show up in Foton are not the same as
what I have in Matlab-land. |
|
|
3949
|
Thu Nov 18 16:42:29 2010 |
Joonho Lee | Configuration | Electronics | Quad Video for PMCT, RCT, RCR fixed. | The far
right monitor in the control room is now
displaying IMCR, PMCT, RCR, RCT. |
|
|
2510
|
Tue Jan 12 13:24:50 2010 |
Haixing | Update | SUS | Quadrant Magnetic Levitation | I have tried to make the quadrant magnetic
levitation work but unfortunately I did
not succeed. During the experiment, I |
|
|
16348
|
Mon Sep 20 15:42:44 2021 |
Ian MacMillan | Summary | Computers | Quantization Code Summary | This post serves as a summary and description
of code
to run to test the impacts of quantization |
|
|
16355
|
Wed Sep 22 14:22:35 2021 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | Now that we have a model of how the SS
and IIR filters work we can get to the problem
of how to measure the quantization noise |
|
|
16360
|
Mon Sep 27 12:12:15 2021 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | I have not been able to figure out a way
to make the system that Aaron and I talked
about. I'm not even sure it is possible |
|
|
16361
|
Mon Sep 27 16:03:15 2021 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | I have coded up the procedure in the previous
post: The result does not look like what
I would expect. |
|
|
16362
|
Mon Sep 27 17:04:43 2021 |
rana | Summary | Computers | Quantization Noise Calculation Summary | I suggest that you
change the corner frequency
to 10 Hz as I suggested last week. This filter, |
|
|
16366
|
Thu Sep 30 11:46:33 2021 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | First and foremost I have the updated bode
plot with the mode moved to 10 Hz. See Attachment
1. Note that the comparison measurement is |
|
|
16481
|
Wed Nov 24 11:02:23 2021 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | I added mpmath
to the quantization noise code. mpmath allows
me to specify the precision that I am using |
|
|
16482
|
Wed Nov 24 13:44:19 2021 |
rana | Summary | Computers | Quantization Noise Calculation Summary | This looks great. I think what we want
to see mainly is just the noise in the 32
bit IIR filtering subtracted from the 64 |
|
|
16492
|
Tue Dec 7 10:55:25 2021 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | [Ian, Tega]
Tega and I have gone through the
IIR |
|
|
16498
|
Fri Dec 10 13:02:47 2021 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | I am trying to replicate the simulation
done by Matt Evans in his
presentation (see Attachment |
|
|
16836
|
Mon May 9 15:32:14 2022 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | I made the first pass at a tool to measure
the quantization noise of specific filters
in the 40m system. The code for which can |
|
|
17127
|
Fri Sep 2 13:30:25 2022 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | P.
P. Vaidyanathan wrote a chapter in the
book "Handbook |
|
|
1888
|
Tue Aug 11 23:55:04 2009 |
rana, rich | Summary | OMC | Quantum Efficiency and Dark Current measurements of eLIGO Photodiodes | Rich Abbott, Rana
Summary: We found that the 3mm
InGaAs photodiodes from eGTRAN which are |
|
|
3760
|
Fri Oct 22 03:37:56 2010 |
Kevin | Update | PSL | Quarter Wave Plate Measurements | [Koji and Kevin]
We measured the reflection from the
PBS as a function of half wave plate rotation |
|
|
3768
|
Sat Oct 23 02:25:49 2010 |
Kevin | Update | PSL | Quarter Wave Plate Measurements |
|
|
|
3776
|
Mon Oct 25 02:25:21 2010 |
Koji | Update | PSL | Quarter Wave Plate Measurements | Q1. Suppose the laser beam has a certain
(i.e. arbitrary) polarization state but contains
only TEM00. Also suppose the PSB is perfect |
|
|
3747
|
Wed Oct 20 21:33:11 2010 |
Kevin | Update | PSL | Quarter Wave Plate Optimization | [Suresh and Kevin]
We placed the quarter wave plate
in front of the 2W laser and moved the half |
|
|
15404
|
Wed Jun 17 16:27:51 2020 |
gautam | Update | VAC | Questions/comments on vacuum | I missed the vacuum discussion on the call
today, but I have some questions/comments:
Isn’t it true that |
|
|
15406
|
Thu Jun 18 11:00:24 2020 |
Jon | Update | VAC | Questions/comments on vacuum |
Quote:
|
|
|
15407
|
Thu Jun 18 12:00:36 2020 |
gautam | Update | VAC | Questions/comments on vacuum | I agree there were MEDM fields, but I can't
find any record of these channels being recorded
till 2018 December, so I don't agree |
|
|
15408
|
Thu Jun 18 14:13:03 2020 |
Jon | Update | VAC | Questions/comments on vacuum | I agree there
were MEDM fields, but I can't find any |
|
|
15410
|
Thu Jun 18 15:46:34 2020 |
gautam | Update | VAC | Questions/comments on vacuum | So why not just have a special mode for
the interlock code during pumpdown and venting,
and during normal operation we expect the |
|
|
15413
|
Fri Jun 19 07:40:49 2020 |
Jon | Update | VAC | Questions/comments on vacuum | I think we should discuss interlock possibilities at
a 40m meeting. I'm reluctant to make
the system more complicated, but perhaps |
|
|
15415
|
Fri Jun 19 09:57:35 2020 |
gautam | Update | VAC | Questions/comments on vacuum | For this particular email service, ideally
the email should be sent out as soon as the
interlock is tripped, so this would require |
|
|
8509
|
Mon Apr 29 23:02:48 2013 |
Koji | Configuration | LSC | Questons | Q. How much Schnupp asymmetry we want in
order to improve the signal ratio between
PRCL/MICH in REFL ports? |
|
|
9850
|
Thu Apr 24 16:25:31 2014 |
ericq | Update | LSC | Quick CM servo prep | I added ~1m of cable to the LO side of
the REFL11 Demodulator, which brought its
PRCL demod phase to about 8 degrees. According |
|
|
12591
|
Wed Nov 2 12:05:00 2016 |
ericq | Update | ASC | Quick WFS thoughts | I poked around a bit thinking about what
we need for a single AS WFS.
New things that we would need: |
|
|
11594
|
Mon Sep 14 16:50:12 2015 |
ericq | Update | LSC | Quick note | Just a heads up while I'm out for a
bit: the delay line is currently installed
in the 55MHz modulation path. |
|
|
11508
|
Fri Aug 14 21:40:26 2015 |
Ignacio | Update | LSC | Quick static offline subtractions of YARM | Plotte below
are the resultant subtractions for YARM using
different witness configurations, |
|
|
8156
|
Mon Feb 25 13:01:39 2013 |
Koji | Summary | General | Quick, compact, and independent tasks | - IMC PDH demodulation phase adjustment
- Permanent setup for green transmission
DC PDs on the PSL table |
|
|
1010
|
Tue Sep 30 19:50:27 2008 |
Jenne | Update | PSL | Quicky Summary - more details later | Quicky summary for now, more details later
tonight / tomorrow morning:
|
|
|
6494
|
Fri Apr 6 11:32:09 2012 |
Jenne | Update | Computers | RAID array is rebuilding.... | Suresh reported to Den, who reported to
me (although no elogs were made.....) that
something was funny with the FB. I |
|
|
6495
|
Fri Apr 6 14:39:21 2012 |
Jamie | Update | Computers | RAID array is rebuilding.... | The RAID (JetStor SATA 416S) is indeed
resyncing itself after a disk failure.
There is a hot spare, so it's stable for |
|
|
1973
|
Tue Sep 8 15:14:26 2009 |
rana, alex | Configuration | DAQ | RAID update to Framebuilder: directories added + lookback increased | Alex
logged in around 10:30 this morning and, |
|
|
6082
|
Wed Dec 7 18:47:36 2011 |
Jenne | Update | RF System | RAM Mon is now being demodulated | There were 2 open outputs on the splitter
in the RAMmon (formerly known as Stochmon) |
|
|
6084
|
Thu Dec 8 00:04:50 2011 |
rana | Update | IOO | RAM Mon is now being demodulated | Monitoring good, but remember that the
EOM alignment must be done carefully to minimize
the RAM before we can use these trends. |
|
|
6059
|
Thu Dec 1 12:27:51 2011 |
Zach | Metaphysics | RF System | RAM diagnosis/suppression plan? | It seems like there is some confusion---or
disagreement---amongst the lab about how |
|
|
6069
|
Mon Dec 5 09:46:21 2011 |
Zach | Metaphysics | RF System | RAM diagnosis/suppression plan? | Since no
one has made any comments |
|
|
10625
|
Fri Oct 17 17:52:55 2014 |
Jenne | Update | LSC | RAM offsets | Last
night I measured our RAM offsets and looked
at how those affect the PRMI situation. |
16x |
|
6417
|
Wed Mar 14 16:33:20 2012 |
keiko | Update | LSC | RAM simulation / RAM pollution plot | In the last post, I showed that SRCL element
in the MICH sensor (AS55I-mich) is chaned
1% due to RAM. |
|
|
6475
|
Mon Apr 2 18:24:34 2012 |
keiko | Update | LSC | RAM simulation for Full ifo | I extended my RAM script from DRMI
(3DoF) to the full IFO (5DoF).
Again, it calculates the operation |
|
|
6478
|
Tue Apr 3 01:52:15 2012 |
Zach | Update | LSC | RAM simulation for Full ifo |
|
|