| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1468
|
Fri Apr 10 03:10:08 2009 |
rana | Summary | Locking | Laser PM to REFL-DC transfer functions at multiple CARM offsets | I hereby award the previous rainbow transfer
functions the plot innovation of the month
award for its use of optical frequency to |
|
|
1476
|
Sun Apr 12 19:31:43 2009 |
rana | Summary | Electronics | Amphony 2500 Headphones | We bought the Amphony 2500 Digital Wireless
headphones recently. The other cheapo headphones
we have are OK for control room use, but |
|
|
1500
|
Mon Apr 20 18:17:44 2009 |
rob | Summary | Locking | CARM offset/Power rubric | Plotted assuming the average arm power
goes up to ~80. No DARM offset. |
|
|
1505
|
Mon Apr 20 23:27:59 2009 |
rana | Summary | VAC | c1vac2 rebooted: non-functional for several months | We found several problems with the framebuilder
tonight. The first symptom was that it was
totally out of
|
|
|
1510
|
Thu Apr 23 16:35:23 2009 |
Yoichi | Summary | Computer Scripts / Programs | restoreWatchdog script | When the IFO loses lock during the lock acquisition
steps, it often kicks the MC2 (through the
CM servo) and trips the watchdog.
|
|
|
1513
|
Thu Apr 23 21:13:37 2009 |
Yoichi | Summary | Environment | Mag. 4 earthquake in LA tripped the watchdogs of the most optics | So far, no damage is noticeable.
restoreWatchdog script was useful :-)
|
|
|
1538
|
Fri May 1 18:24:36 2009 |
Alberto | Summary | General | jitter of REFL beam ? | Some loud thinking.
For
the measurement of the length of the PRC,
I installed a fast photodiode in the path |
|
|
1539
|
Fri May 1 18:51:34 2009 |
Alberto | Summary | Environment | earthquake | Earthquake 4.4 Leo Carrillo Beach.
Some of the watchdogs tripped out. |
|
|
1552
|
Wed May 6 19:04:11 2009 |
rana | Summary | VAC | vac images | Since there's no documentation on this besides
Steve's paper notebooks...
|
|
|
1563
|
Fri May 8 04:46:01 2009 |
rana, yoichi | Summary | oplevs | BS/PRM/SRM table bad! | We went to center the oplevs because they
were far off and found that (as usual) the
numbers changed
|
|
|
1579
|
Wed May 13 02:53:12 2009 |
rob | Summary | lore | Channel Hopping: That ancient enemy (MC problems) | We were stymied tonight by a problem which
began late this afternoon. The MC would
periodically go angularly unstable, breaking |
|
|
1582
|
Wed May 13 14:43:29 2009 |
rob | Summary | lore | Channel Hopping: That ancient enemy (MC problems) |
|
|
|
1583
|
Wed May 13 21:15:04 2009 |
rana | Summary | SUS | Channel Hopping: That ancient enemy (MC problems) | The MC side problem could also be the side
tramp unit problem. Set the tramp to 0 and
see if that helps. |
|
|
1584
|
Thu May 14 00:15:39 2009 |
rob | Summary | SUS | Channel Hopping: That ancient enemy (MC problems) | [quote]The MC side problem could also be the
side tramp unit problem. Set the tramp to
0 and see if that helps.[/quote]
|
|
|
1586
|
Thu May 14 15:28:28 2009 |
steve | Summary | SUS | April 24 earthquake effect on MC2 | [quote][quote]The MC side problem could also
be the side tramp unit problem. Set the tramp
to 0 and see if that helps.[/quote]
|
|
|
1587
|
Thu May 14 16:07:20 2009 |
pete | Summary | SUS | Channel Hopping: That ancient enemy (MC problems) | [quote][quote]The MC side problem could also
be the side tramp unit problem. Set the tramp
to 0 and see if that helps.[/quote]
|
|
|
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
|
|
|
1608
|
Tue May 19 16:08:03 2009 |
rana | Summary | SEI | EUCLID | From Stuart Aston, I've attached a picture
of the EUCLID position sensor: |
|
|
1618
|
Thu May 21 18:21:57 2009 |
rana | Summary | Treasure | Yoichi's words | |
|
|
1638
|
Mon Jun 1 14:49:07 2009 |
rob | Summary | PSL | psl thoughts | Some thoughts on what happened with the
MOPA cooling.
Some unknown thing happened to precipitate |
|
|
1685
|
Thu Jun 18 23:20:40 2009 |
rob | Summary | LSC | I-Q ratio with RF detected DARM | This is a ratio of PD1_I to PD1_Q (so a
ratio of the two quadratures of AS166), measured
in an anti-spring state. It's not flat |
|
|
1717
|
Tue Jul 7 15:08:49 2009 |
Koji | Summary | Photos | 40 high school students visited 40M | Alan and Alberto conducted a tour of 40
high-school students.
It may be the same tour that Rana |
|
|
1795
|
Mon Jul 27 09:34:07 2009 |
steve | Summary | IOO | Aligning the mode cleaner |
|
|
|
1796
|
Mon Jul 27 14:12:14 2009 |
rana | Summary | SUS | TM Coil Noise Spectra | Rob noticed that the ITMY DAC channels were
saturating occassionally. Looking at the
spectrum we can see why.
|
|
|
1864
|
Fri Aug 7 19:34:40 2009 |
steve | Summary | VAC | UPS failed | The Maglev is running on single phase 220V
and that voltage was not interrupted.
TP1 was running undisturbed with V1 and V4 |
|
|
1865
|
Fri Aug 7 19:55:08 2009 |
steve | Summary | VAC | opening V1 when PTP1 is broken | The swapped in 307 convectron gauge controller
is very likely to have the RS232 connection
wired differently from the old one. |
|
|
1874
|
Mon Aug 10 15:24:17 2009 |
rob | Summary | PSL | MZ bad | I think the MZ pzt is broken/failing.
I'm not sure how else to explain this behavior.
The first bit of the time series |
|
|
1875
|
Mon Aug 10 15:56:12 2009 |
rob | Summary | PSL | MZ bad redux |
|
|
|
1887
|
Tue Aug 11 23:17:21 2009 |
rana | Summary | Computers | Nodus rebooted / SVN down | Looks like someone rebooted nodus at ~3
PM today but did not elog it. Also the SVN
is not running. Why? |
|
|
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 |
|
|
1890
|
Wed Aug 12 10:35:17 2009 |
jenne | Summary | Computers | Nodus rebooted / SVN down |
|
|
|
1902
|
Fri Aug 14 14:19:25 2009 |
Koji | Summary | Computers | nodus rebooted | nodus was rebooted by Alex at Fri Aug 14
13:53. I launched elogd.
cd /export/elog/elog-2.7.5/ |
|
|
1903
|
Fri Aug 14 14:33:51 2009 |
Jenne | Summary | Computers | nodus rebooted |
|
|
|
1904
|
Fri Aug 14 15:20:42 2009 |
josephb | Summary | Computers | Linux1 now has 1.5 TB raid drive |
|
|
|
1916
|
Mon Aug 17 02:12:53 2009 |
Yoichi | Summary | Computers | FE bootfest | Rana, Yoichi
All the FE computers went red this evening.
|
|
|
1919
|
Mon Aug 17 09:52:04 2009 |
rob | Summary | General | conlogger restarted | I restarted the conlogger on op340m.
This needs to be done when op340m is rebooted--it
wasn't done for some reason and so we've |
|
|
1920
|
Mon Aug 17 17:43:11 2009 |
rana | Summary | General | conlogger restarted | Added the conlog directory to the SVN,
minus the enormous data directory. We are
now free to make changes to the conlog code. |
|
|
1921
|
Mon Aug 17 17:48:49 2009 |
rob | Summary | General | conlogger restarted |
|
|
|
1923
|
Tue Aug 18 14:24:43 2009 |
Yoichi | Summary | PSL | Reference Cavity Inspection | Rana, Koji, Yoichi
To see why the reflected beam from the RC |
|
|
1933
|
Fri Aug 21 17:28:50 2009 |
Kevin, rana | Summary | PEM | Magnetic Field Measurements Around the Lab |
|
|
|
1934
|
Fri Aug 21 17:49:47 2009 |
Yoichi | Summary | Computers | Upgrade FE conceptual plan | I started to draw a conceptual diagram of
the upgraded FE system.
http://nodus.ligo.caltech.edu:30888/FE/FE-Layout.html
|
|
|
1941
|
Tue Aug 25 03:30:23 2009 |
Yoichi | Summary | WIKI-40M Update | Green lock and phase noise | While Koji and I were discussing about the
green laser lock, we wondered if the common
motion of the cavity mirrors,
|
|
|
1942
|
Tue Aug 25 11:02:39 2009 |
rana | Summary | PSL | Temperature Box | The PSL Temperature Box (D980400-B-C, what
kind of numbering scheme is that?) modified
at LHO/LLO ~8 years ago to have better resolution |
|
|
1956
|
Thu Aug 27 13:42:08 2009 |
rana | Summary | PSL | Reference Cavity Temperature Control: psl.db changes | I made the changes
to the psl.db to handle the new Temperature |
|
|
1958
|
Thu Aug 27 16:14:28 2009 |
steve | Summary | OMC | burned photodiode | Old -pre 6/2009 LLO DCPD 3 mm od
GTRAN photodiode |
|
|
1967
|
Fri Sep 4 16:09:26 2009 |
josephb | Summary | VAC | Rebooted RGA computer and reset RGA settings | Steve noticed the RGA was not working today.
It was powered on but no other lights were
lit. |
|
|
1978
|
Tue Sep 8 20:15:33 2009 |
rana, jenne | Summary | PSL | RC temperature servo: Heater Voltage noise | We measured the voltage noise of the
heater used to control the RC can temperature.
It is large. |
|
|
1993
|
Fri Sep 18 16:26:02 2009 |
steve | Summary | PSL | Neslab chiller is OK | Rob found puddles of water very close to
the chiller during lunch time. We raised
the unit and took the side cover off. All |
|
|
1999
|
Thu Sep 24 20:17:05 2009 |
rana | Summary | LSC | Comparison of Material Properties for the new RFPD Mounts |
|
|
|
2043
|
Fri Oct 2 15:24:29 2009 |
sanjit, rana | Summary | IOO | mcwfs centered | we set the offsets for the MCWFS DC and
for the MCWFS demod outputs and then turned
off the lights put the MZ at half fringe |
|