| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
10341
|
Wed Aug 6 21:22:09 2014 |
Koji | Update | IOO | FSS offset changed | The fast feedback
should be around zero now! |
|
|
10340
|
Wed Aug 6 17:29:36 2014 |
Jenne | Update | IOO | FSS offset changed | The MC has been unstable and unhappy for
the last several hours. When I looked,
I saw that the FSS_FAST monitor has been |
|
|
10339
|
Wed Aug 6 13:17:21 2014 |
ericq | Omnistructure | CDS | cdsutils: multifarious upgrades | I've checked out cdsutils-274 to /opt/rtcds/cdsutils,
and updated the /ligo/apps/ligoapps-user-env.sh
to have the newer machines use it by default. |
|
|
10338
|
Wed Aug 6 12:44:52 2014 |
Koji | Update | ASC | POP QPD signals | This is nice. Can we test this idea with
POP22 + a razor blade?
Just to take transfer functions in |
|
|
10337
|
Wed Aug 6 10:45:56 2014 |
Gabriele | Update | ASC | POP QPD signals | In addition to the simulation described
in my
previous elog, I simulated the signal |
|
|
10336
|
Wed Aug 6 10:10:45 2014 |
Harry | Update | General | Weekly Plan 8.6.14 | Last Week
Took first round of PER measurements |
|
|
10335
|
Wed Aug 6 00:14:10 2014 |
Jenne | Update | LSC | ALS is iffy tonight | The ALS system is iffy tonight.
After putting the cable back to the
RF spectrum analyzer (it had been taken to |
|
|
10334
|
Tue Aug 5 19:20:05 2014 |
Akhil | Update | General | PID loop Design for beat note stabilization | Today I and EricQ went inside the
lab and set up the cables running from the
a DAC channel into PZT input so that |
|
|
10333
|
Tue Aug 5 19:05:41 2014 |
Akhil | Update | General | Beat Note Testing on EPICS Channels | |
|
|
10332
|
Tue Aug 5 17:24:37 2014 |
Nichin | Update | Computer Scripts / Programs | PDFR update | The PDFR system now has the capability
to automatically run vectfit3.mat using a
wrapper script named vectorfitzpk.m |
|
|
10331
|
Mon Aug 4 22:52:03 2014 |
Jenne | Update | LSC | ALS alignment tweak-up | After aligning the arms to IR, I aligned
the Y green beam to the arm. Also,
the X green beatnote was very small, so I |
|
|
10330
|
Mon Aug 4 18:25:46 2014 |
Jenne | Update | General | Chronic Suspension Problems | Q is working on fixing the "save offsets"
script for the ASS, because that has lost
me my alignment two more times in the last |
|
|
10329
|
Mon Aug 4 17:30:00 2014 |
ericq | Update | General | Chronic Suspension Problems | TRX and TRY communication were recovered
by doing a simultaneous reboot of all of
the frontends. |
|
|
10328
|
Mon Aug 4 09:17:42 2014 |
Steve | Update | SUS | ITMX is still kicked |
|
|
|
10327
|
Sun Aug 3 23:47:56 2014 |
Koji | Update | General | Recovery efforts | It's great that you guys found the beam.
Yes, ITMX kick and lost communication |
|
|
10326
|
Sun Aug 3 17:19:32 2014 |
ericq | Update | General | Recovery efforts | [ericq, Jenne]
We both happened to come by today
to fix things up. |
|
|
10325
|
Fri Aug 1 22:56:27 2014 |
Koji | Update | General | Beam lost in the chamber??? | I was investigating several issues on the
IFO. As many of you noticed and not elogged,
ITMX had frequent kicking without its oplev |
|
|
10324
|
Fri Aug 1 18:48:46 2014 |
Akhil | Summary | Electronics | PZT Calibration |
The PZT actuation on the laser
frequency in MHz/V ( assuming the previous |
|
|
10323
|
Fri Aug 1 15:32:07 2014 |
ericq | Update | Computer Scripts / Programs | Elog and svn backups | Koji and Evan have both brought up a good
point that we may not be backing up the svn
and ELOG properly. |
|
|
10322
|
Fri Aug 1 12:49:06 2014 |
Koji | Summary | IOO | MC servo analysis | Reasoning to choose the current parameters:
FSS Common: 18dB
FSS Fast: 20dB |
|
|
10321
|
Fri Aug 1 11:11:12 2014 |
Koji | Update | IOO | Current IMC servo configuration | The comparison between the new and old
MC servo (FSS part) was attached.
- The new servo has the same DC |
|
|
10320
|
Fri Aug 1 10:40:48 2014 |
Koji | Summary | IOO | MC servo summing amp | The
summing amp is prepared to allow up to use
bipolar full range of the FSS box output
|
|
|
10319
|
Fri Aug 1 08:55:34 2014 |
Koji | Summary | IOO | MC auto locker | It seems that the MC auto locker and the
FSSSlow PID servo survived a night.
PC Drive is still angry occasionally. |
|
|
10318
|
Fri Aug 1 03:49:26 2014 |
Koji | Summary | General | Koji - to do | - Put the circuit diagram of the
sum amp on/in the circuit enclosure and associate
it with an elog [done]. |
|
|
10317
|
Fri Aug 1 01:57:24 2014 |
Koji | Summary | IOO | MC auto locker | To make MC auto locker running correctly,
mcdown and mcup were revised
I tried it by unlocking MC several |
|
|
10316
|
Fri Aug 1 01:29:55 2014 |
Koji | Update | IOO | PMC issue | - PMC suddenly refused to lock.
- Investigated what's wrong
- Finally, I touched RF Output Adjust |
|
|
10315
|
Fri Aug 1 00:51:07 2014 |
Koji | Update | PSL | FSSSlowServo update | FSS Slow set point to be zero
op340m:FSS>cat FSSSlowServo
#!/usr/bin/perl -w |
|
|
10314
|
Thu Jul 31 23:43:00 2014 |
Koji | Update | IOO | Modulation frequency adjustment | The main IFO modulation frequency was adjusted
to match with the FSR of the IMC.
The new frequency is 11.066128 MHz. |
|
|
10313
|
Thu Jul 31 23:19:22 2014 |
Koji | Update | Computer Scripts / Programs | SVN bulletin | Did this break "netgpibdata"?
I couldn't download data from SR785.
Downloading from AG4395A was OK. |
|
|
10312
|
Thu Jul 31 21:59:25 2014 |
Koji | Bureaucracy | General | Ants | Don't leave your
food on tables and desks!
Also I put the souvenir chocolates |
|
|
10311
|
Thu Jul 31 21:21:49 2014 |
Koji | Frogs | elog | MicroSoft BingBot is attacking us | Oh,
this is cool! Thanks!
I could not figure out how to place |
|
|
10310
|
Thu Jul 31 19:37:59 2014 |
Koji | Update | IOO | Successful modification of the FSS | Quick note:
Migration
of the 10Hz pole from the output stage of |
|
|
10309
|
Thu Jul 31 18:54:03 2014 |
Chris | Frogs | elog | MicroSoft BingBot is attacking us |
|
|
|
10308
|
Thu Jul 31 15:25:51 2014 |
Harry | Update | General | PolarizationExtinction Ratio of Fibers | Purpose
We wanted to measure the PER of the
polarization maintaining fibers, so we could |
|
|
10307
|
Thu Jul 31 14:23:28 2014 |
Akhil | Summary | Electronics | PZT Calibration |
The PZT seems to saturate at
around +/- 3500 counts. So for the Y arm, |
|
|
10306
|
Thu Jul 31 12:23:38 2014 |
Koji | Summary | Electronics | PZT Calibration | 1) Don't be brainless. Redo the fitting
of the Y arm. Obviously the fit is not good.
2) How can you explain the value |
|
|
10305
|
Thu Jul 31 12:01:35 2014 |
Nichin | Update | Computer Scripts / Programs | PDFR update | The Transimpedance plots of PDFR now have
a reference plot or baseline plot along with
the current measurement, for easy comparision. |
|
|
10304
|
Thu Jul 31 11:54:54 2014 |
Akhil | Summary | Electronics | PZT Calibration | Koji asked me to get the calibration
of the PZT counts to Volts for the the X
and Y ends. Yesterday, I went inside the |
|
|
10303
|
Thu Jul 31 09:14:14 2014 |
ericq | Update | IOO | MC stability | Last night, I poked around to try
and see if I could reproduce the sketchy
MC behavior by exciting MC2 in a way that |
|
|
10302
|
Thu Jul 31 01:08:54 2014 |
Koji | Update | LSC | ALS stability check | - ALS X/Y arm stability was checked by
IR locked arms.
- Basically the stability looks same |
|
|
10301
|
Wed Jul 30 23:12:05 2014 |
Koji | Update | General | IFO patrol | - The cable for the beat note was disconnected
from the frequency counter and reconnected
to the spectrum analyzer. |
|
|
10300
|
Wed Jul 30 22:01:24 2014 |
Koji | Update | LSC | MC servo | In fact there is a pomona box between the
HV amp and the laser.
It is expected that the combination |
|
|
10299
|
Wed Jul 30 18:09:08 2014 |
Harry | Update | General | AUX and PSL Coupling Telescopes | Purpose
These telescopes will be used to
mode match//couple the dumped SHG light from |
|
|
10298
|
Wed Jul 30 15:33:48 2014 |
Akhil | Summary | General | Calibrated Thermal Actuator TFs | The goal of the measurements we made
( my previous 3 elogs) was to characterize
the laser frequency thermal actuator that |
|
|
10297
|
Wed Jul 30 11:15:44 2014 |
Akhil | Update | General | Weekly Update | Plan for the week:
PID loop design and testing
with the Green laser beat note by actuating |
|
|
10296
|
Wed Jul 30 10:16:54 2014 |
Andres | Update | 40m Xend Table upgrade | Green Steering Mirror Upgrade completed | Green Steering Mirror Update
Yesterday,
Nick and I completed the green steering mirrors
upgrade. I attached the file that contained |
|
|
10295
|
Wed Jul 30 09:51:18 2014 |
Steve | Update | PSL | PSL Innolight controller fan is noisy |
|
|
|
10294
|
Wed Jul 30 09:33:33 2014 |
Steve | Update | SUS | RIN of HeNe lasers | From old 40m elog 5-29-2007 |
|
|
10293
|
Wed Jul 30 00:42:27 2014 |
Koji | Update | LSC | MC servo | I used an oscillator and an oscilloscope
to measure the open loop transfer function
at higher frequency than 100kHz. |
|
|
10292
|
Tue Jul 29 21:34:41 2014 |
ericq | Update | Computer Scripts / Programs | SVN bulletin | A heads
up to anyone using SVN with computers on
the Martian network: |
|