| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1455
|
Wed Jul 23 00:28:14 2014 |
tara | DailyProgress | optic | setting up scattered light measurement | I'm checking
the linearity of power and exposure on the
camera. The ccd counts are quite linear with |
|
|
1456
|
Thu Jul 24 02:00:23 2014 |
tara | DailyProgress | optic | setting up scattered light measurement | I rechecked the CCD response
vs exposure time and power. The results
are linear. |
|
|
1208
|
Mon Jun 24 21:27:02 2013 |
tara | Notes | RefCav | setup for 2nd refcav | I'm in the process of locking the 2nd cavity.
The work is in progress.
The 2nd TTFSS is |
|
|
1267
|
Tue Jul 30 16:19:32 2013 |
Erica | Notes | fiber optic | setup for beam recombination | Diagram for newest setup with additional half
wave and lenses:
[IMG]elog:1267/2[/IMG][IMG]elog:1267/1[/IMG] |
|
|
1047
|
Sun Sep 16 16:42:16 2012 |
tara | DailyProgress | fiber optic | setup for fiber optic distribution. | I'm setting up fiber optic so that I can
send frequency stabilized laser to ATF. Right
now the power coming out is small (0.8 mW |
|
|
1049
|
Mon Sep 17 20:59:15 2012 |
tara | DailyProgress | fiber optic | setup for fiber optic distribution. | I adjusted the mode matching a bit
( changing lenses positions and rotate the
lens on the collimator). |
|
|
66
|
Tue Feb 16 19:33:53 2010 |
Frank | Laser | Laser | several shutdowns the last days | we had several shutdowns of the laser within
the last days. A couple of times the well
known "HT error", today we had |
|
|
586
|
Fri Apr 22 12:50:44 2011 |
Frank | Notes | Purchases | shoe covers | ordered new shoe covers. Will try those
below as they seem to be better than the
ones we had but are much cheaper. Come in |
|
|
928
|
Thu Apr 19 21:10:59 2012 |
Frank | Notes | Drawings | short cavities | detailed CAD drawings for the short cavities,
mirrors, cavity mount, radiation shields,
adapter plates and modified top stack |
|
|
656
|
Thu Aug 11 15:18:28 2011 |
Raphael | DailyProgress | Electronics Equipment | shot noise characterization | Here is the characterization of the shot
noise.
|
|
|
2329
|
Sun Apr 28 22:29:18 2019 |
rana | Summary | Electronics Equipment | should I use an OpAmp as a Comparator? | not all amps are good for
use as a comparator |
|
|
925
|
Wed Apr 18 23:53:01 2012 |
Frank, Tara | DailyProgress | Foam | simple insulating box | to test how much insulation we need to
reduce our acoustic noise (or air currents)
problem we've added a simple aluminum-foil |
|
|
660
|
Thu Aug 18 23:12:42 2011 |
Raphael | Summary | FSS | simulink just about done. Feedback appreciated. | So over the whole summer, I've put together,
little by little, the simulink model for
the path that locks the laser to the reference |
8x |
|
652
|
Tue Aug 9 00:01:08 2011 |
Raphael | DailyProgress | FSS | simulink model | Hey,
So I'm done-ish with the simulink
file that models the loop that locks the |
|
|
767
|
Fri Dec 23 12:00:54 2011 |
Frank | Notes | Computers | slow (laser temp) feedback script fixed. | Software feedback to laser temp didn't
work correctly. Fixed it.
Script is located in /usr1/epics/psl/scripts |
|
|
299
|
Thu Aug 19 19:19:26 2010 |
tara | Notes | Computers | slow actuator note | ACAV 0.2602 V
RCAV 0.1102 V |
|
|
20
|
Tue Nov 24 11:07:30 2009 |
Frank | Laser | RefCav | slow actuator settings | slow actuator settings for being resonant:
update
@1pm: |
|
|
254
|
Wed Aug 4 16:21:01 2010 |
Frank | Notes | RefCav | slow actuator values for both cavities | - personal notes -
slow actuator values
RCAV : 0.1915ACAV : 0.2050 |
|
|
264
|
Mon Aug 9 12:55:40 2010 |
Frank | Notes | RefCav | slow actuator values for both cavities | both cavities @35 degrees +/- 5mK
slow actuator values |
|
|
1155
|
Mon Apr 22 17:13:24 2013 |
tara | Notes | DAQ | slow feedback to laser via EPICS is on | The medm screen for the 1st laser is completed,
the servo is on an stable. Refcav has been
locked for a few hours as of now. |
|
|
1172
|
Wed May 8 01:11:09 2013 |
tara | Notes | DAQ | slow feedback to laser via EPICS is on | Slow feedback for 2nd laser is ready.
EPICs channel:
C3:PSL-RCAV-FMON was created |
|
|
699
|
Fri Oct 7 14:07:26 2011 |
Frank | HowTo | Vacuum | small baking chamber | i've build a small baking chamber which
we can use for small parts like posts, sensor
and heater assemblies, wires, screws etc. |
|
|
518
|
Mon Feb 28 09:51:15 2011 |
Frank | Summary | Environment | sockets at computer desk fixed | Tom from the electrical workshop fixed
the two sockets at the computer desk.
We also checked the other sockets |
|
|
498
|
Tue Feb 15 23:19:54 2011 |
Frank | DailyProgress | BEAT | some (minor) calibration problem found | Found at least two (minor) problems:
So far i measured the
zero-crossing of the mixer signal and both |
|
|
499
|
Tue Feb 15 23:33:51 2011 |
tara | DailyProgress | BEAT | some (minor) calibration problem found | So, from the first plot, is the calibration
factor for cable delay technique ~ 8MHz/Volt?
|
|
|
501
|
Wed Feb 16 09:14:14 2011 |
Frank | DailyProgress | BEAT | some (minor) calibration problem found | yes, for yesterdays measurements 7.435
MHz/V.
But that number changes from measurement |
|
|
243
|
Wed Jul 28 22:17:15 2010 |
Frank | Notes | DAQ | some connections to P4-3113A (J2 and J3) | - personal notes -
J2 63/64 CH31 PSL-ISS_AOMRF |
|
|
294
|
Wed Aug 18 20:11:44 2010 |
Frank | Summary | DAQ | some signals moved to VME DAQ system | moved the first 8 signals, the 4 individual
sensors for each cavity, to the VME DAQ system.
|
|
|
769
|
Tue Dec 27 16:11:07 2011 |
Frank | Notes | Seismic | stack TF updated | updated the stack TF using more accurate
numbers for the RTV springs and masses and
also updated the proposed TF for the stack |
|
|
1048
|
Mon Sep 17 19:06:36 2012 |
tara | Notes | PMC | stainless steel pmc | I got PMC drawing from Dmass, this will
be similar to gyro's steel PMC. I'll submit
the work to machine shop soon. |
|
|
1052
|
Mon Sep 24 16:41:19 2012 |
tara | Notes | PMC | stainless steel pmc | [with Zach and Dmass] We discussed about
the stainless steel pmc design and
here are the list of what should be modified. |
|
|
1077
|
Thu Nov 15 00:33:01 2012 |
tara | Notes | PMC | stainless steel pmc | Kriten sent me solidwork part files for
the steel pmc. I'm checking all the
parts and will decide what material we want |
|
|
1078
|
Thu Nov 15 18:59:17 2012 |
tara | Notes | PMC | stainless steel pmc | The PMC round trip is ~ 0.32m. The end
mirror has ROC = 1.0m. The spotsize is 384
micron. The end mirror has radius ~2.5 |
|
|
335
|
Tue Aug 31 21:59:19 2010 |
Frank | Summary | Computers | still network problems | i tried to figure out where the network
problems come from. Looks like it's the fiber
connection between fb1 and the switch in |
|
|
270
|
Tue Aug 10 22:57:25 2010 |
Frank | DailyProgress | RefCav | strange channel behavior | we have probably some minor network problems
which causes some channels not beeing available
at all times even on the same computer. |
|
|
54
|
Fri Feb 5 21:53:13 2010 |
Frank | Laser | RefCav | strange things going on | in order to get an idea about the part/subsystem
causing the RF power modulation while sweeping
the VCO frequency i changed the length of |
|
|
55
|
Sat Feb 6 12:19:14 2010 |
rana | Laser | RefCav | strange things going on | Seem like
a screwy AOM. I would take the double-passed |
|
|
74
|
Tue Feb 23 20:13:00 2010 |
Tara Chalermsongsak | Laser | RefCav | successfully use ifr2023 to track the frequncy drift of the beat | The drift in the demodulated signal
(beat frequency x local oscillator) can be
tracked by using ifr2023 and sr560. We successfully |
|
|
75
|
Wed Feb 24 11:58:20 2010 |
rana | Laser | RefCav | successfully use ifr2023 to track the frequncy drift of the beat | Volts? What are Volts???
This plot should be converted into
radians/rHz or Hz/rHz in order to be used. |
|
|
183
|
Tue Jun 29 14:22:31 2010 |
Frank | Notes | NoiseBudget | summary of emissivity coefficients for refcav experiment | emissivity
coefficients - ε -
(300K) |
|
|
527
|
Wed Mar 2 16:07:29 2011 |
Frank | Photos | RefCav | suspended cavity for cavity damping experiment | i've suspended another cavity (very similar
to the LIGO refcav) on an old stack which
is a bit longer than the one we currently |
|
|
530
|
Thu Mar 3 01:04:46 2011 |
tara | Photos | RefCav | suspended cavity for cavity damping experiment | I measured Q factor for a few modes
of refcav's suspension system, by shadow
sensing technique, and found out that |
|
|
423
|
Thu Dec 9 00:20:33 2010 |
tara | DailyProgress | Electronics Equipment | switching ACAV/RCAV RFPDs | I switched the RFPD between
RCAV and ACAV, now the gain for FSS loop
is set to 26 dB, but the beat signal does |
|
|
336
|
Wed Sep 1 00:27:34 2010 |
tara | Notes | BEAT | symmetric optic layout for beat measurement | A tentative layout for almost symmetric
layout for beat measurement. The double 1/4
objects in the beam paths should be |
|
|
1376
|
Wed Oct 30 01:56:38 2013 |
tara | DailyProgress | optic | table work | I'm optimizing the setup, and clearing
the table a little bit.
Self homodyne setup in |
|
|
533
|
Fri Mar 4 00:58:02 2011 |
Frank | Photos | Seismic | table-shaker (longitudinal motion) | |
|
|
822
|
Mon Feb 13 13:16:02 2012 |
Frank | Notes | BEAT | temp coefficient of coax cables | from
Measurements
of Earth-station delay instabilities using |
|
|
1055
|
Wed Oct 3 17:48:26 2012 |
tara | Notes | TempCtrl | temp control for the chamber is off | I checked the temperature control servo
for the vacuum chamber and found out that
it was off. I could not turn it back on yet |
|
|
1883
|
Mon Aug 28 16:19:53 2017 |
Kira | Summary | TempCtrl | temp sensor | I built a temperature sensor prototype
for the 40m lab, which can be used for
the PSL lab as well for temperature stabilization. |
|
|
1884
|
Mon Aug 28 22:30:34 2017 |
Craig, awade | DailyProgress | TempCtrl | temp sensor | Kira built the circuit below and and handed
it off to Andrew and I at around noon today.
We tested it and found it was extremely noisy. |
|