| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
951
|
Wed May 2 19:48:32 2012 |
frank, tara | DailyProgress | Acoustics | acoustic enclosure for input beam | We measured
the frequency response(microphone out/signal
to speaker) to see how well we can shield |
|
|
952
|
Thu May 3 22:26:14 2012 |
frank, tara | DailyProgress | Acoustics | acoustic enclosure for input beam | We are still working on the acoustic shielding
panels. The work should be done by tomorrow.
|
|
|
953
|
Fri May 4 20:19:58 2012 |
frank, tara | DailyProgress | Acoustics | acoustic enclosure for input beam | The enclosure box for input optics are
done. We still need to order more of the
nuts for one panel, but the box should provide |
|
|
955
|
Wed May 9 03:11:33 2012 |
frank, tara | DailyProgress | Acoustics | acoustic enclosure for input beam | I check the performance of the enclosure
box for input optics. It neither improves
the beat signal that much. |
|
|
972
|
Wed May 30 23:39:15 2012 |
frank, tara | DailyProgress | Acoustics | acoustic enclosure for input beam | We started installing the new acoustic
enclosure box for the beat path. It covers
the whole beat setup and the part for power |
|
|
973
|
Wed May 30 23:39:41 2012 |
frank, tara | DailyProgress | Acoustics | acoustic enclosure for input beam | We started installing the new acoustic
enclosure box for the beat path. It covers
the whole beat setup and the part for power |
|
|
975
|
Fri Jun 1 01:00:30 2012 |
frank, tara | DailyProgress | Acoustics | acoustic enclosure for input beam | The beat signal is measured with an adhoc
lid covering the enclosure on the beat part.
There are no significant improvement in the |
|
|
287
|
Tue Aug 17 15:57:11 2010 |
Frank | Notes | BEAT | power on beat PD | - personal notes -
New Focus PD:
power from ACAV: 0.958mW |
|
|
307
|
Thu Aug 26 19:58:06 2010 |
Frank | Notes | BEAT | changed ACAV setpoint temperature - both cavities locked | changed the ACAV temp to 37.3 degrees.
Both cavities are locked now.
I'll monitor the VCO input signal |
|
|
308
|
Thu Aug 26 23:00:35 2010 |
Frank | Notes | BEAT | lock-loss of both cavities | i lost lock of both cavities for some unknown
reason. Also the crate seemed to stop working
as some channels are dead now... |
|
|
309
|
Thu Aug 26 23:18:12 2010 |
Frank | Notes | BEAT | both cavities relocked | relocked both cavities. The second crate
containing the output card to control the
ACAV power supply stopped working and i can't |
|
|
311
|
Fri Aug 27 18:49:43 2010 |
tara | Notes | BEAT | both cavities relocked |
rebooted the crate.
|
|
|
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 |
|
|
350
|
Thu Sep 9 20:55:22 2010 |
tara | Notes | BEAT | calibration V->Hz for IFR2023B | the calibration value is 71.3 kHz/Volt
for the following setup
center freq = 159.294 MHz |
|
|
353
|
Fri Sep 10 12:22:04 2010 |
tara | DailyProgress | BEAT | beat noise measurement | Plot from yesterday measurement. The new
result is in red.
The data is measured from the feedback |
|
|
391
|
Thu Nov 11 22:50:14 2010 |
tara | DailyProgress | BEAT | beat noise measurement | I
measured the beat note signal from two different
setup (f modulation) and plot the result |
|
|
392
|
Mon Nov 15 18:05:34 2010 |
tara | DailyProgress | BEAT | coherence <fbeat|RCAV>, <fbeat|ACAV> | I realigned the beam to PMC,
ACAV, RCAV, optimized gain, and find a significant
coherence between ACAV_RCTRASPD and RCAV_TRANSPD. |
|
|
404
|
Fri Nov 19 14:28:28 2010 |
tara | DailyProgress | BEAT | TF comparison between PLL feedback and VCO feedback | I measured the TF between VCO feedback
and PLL feedback. The result agrees with
the TF of the VCO. |
|
|
405
|
Fri Nov 19 14:36:19 2010 |
Koji | DailyProgress | BEAT | TF comparison between PLL feedback and VCO feedback |
|
|
|
415
|
Wed Dec 1 22:07:05 2010 |
tara | DailyProgress | BEAT | beat vs Power Input | I measured the beat signal from 3
different power input levels, the signal goes down |
|
|
416
|
Fri Dec 3 01:34:02 2010 |
tara | DailyProgress | BEAT | Faraday isolator added behind the PMC | I added a Faraday isolator after
PMC and 35.5 MHz broadband EOM, now the noise
becomes less susceptible to the |
|
|
418
|
Sat Dec 4 00:12:21 2010 |
frank, tara | DailyProgress | BEAT | PD for PLL | The current PD for the 160 MHz beat
signal is 120MHz. We use a 2 GHz PD to compare
the results between two PDS, |
|
|
419
|
Sun Dec 5 18:36:10 2010 |
Frank | DailyProgress | BEAT | PD for PLL: additional information | some additional information:
the beat noise was measured as the
feedback signal to the VCO of the PLL, so |
|
|
420
|
Mon Dec 6 22:09:59 2010 |
frank, tara | DailyProgress | BEAT | replacing PMC, adding EAOM | Today we 1)replaced out PMC with
DMASS' PMC and get better transmission efficiency,
2) added EAOM to modulate the laser intensity |
|
|
421
|
Tue Dec 7 16:15:38 2010 |
tara | Notes | BEAT | PLL OLG TF | I measured the open loop gain TF of the
phase lock loop for beat measurement, at
the current setup, the UGF is 40 kHz. |
|
|
422
|
Wed Dec 8 00:15:42 2010 |
frank, tara | DailyProgress | BEAT | LO phase noise | Today we
1) checked if LO phase noise
dominates at high f. It turned out that it |
|
|
427
|
Sun Dec 12 22:11:11 2010 |
tara | Notes | BEAT | nb with VCO noise at 10khz input range | I got Marconi noise data from Frank, and
plotted it on the noise spectrum to show
that we are limited by LO noise at high f. |
|
|
431
|
Wed Dec 15 11:26:39 2010 |
frank, tara | Notes | BEAT | cleaning optics to get rid of scattering light | We are cleaning optics to reduce
possible scattering light sources. Optics
behind PMC are quite dusty. Improvement in |
|
|
433
|
Fri Dec 17 02:23:38 2010 |
frank, tara | Notes | BEAT | cleaning optics to get rid of scattering light | I'm continuing with cleaning optics.
The optics in cyan circles in |
|
|
449
|
Thu Jan 20 11:32:40 2011 |
tara | Photos | BEAT | beat layout with 3" height | The picture is posted on the board outside
the lab as well. |
|
|
459
|
Mon Jan 31 20:24:45 2011 |
frank, tara | Notes | BEAT | beat signal down to 12.5 mHz | This morning I was able to measure the
beat noise down to 12.5 mHz. So I plot it
together with the noise budget here. |
|
|
461
|
Tue Feb 1 19:26:47 2011 |
Frank | Notes | BEAT | loss of RF cables | found a nice calculator here:
http://vk1od.net/calc/tl/tllc.php
which has a huge amount of different |
|
|
463
|
Tue Feb 1 22:22:46 2011 |
frank, tara | Notes | BEAT | beat signal down to 12.5 mHz | We measured beat noise from the frequency
counter(FC) instead of the feedback from
PLL. The result is plotted below |
|
|
465
|
Wed Feb 2 13:48:22 2011 |
tara | DailyProgress | BEAT | Comparison bewteen beat from PLL and FC | I used PLL feedback to measure beat noise
from dc to 3 Hz and dc to 1.5 Hz to compare
with the data taken yesterday by FC. |
|
|
469
|
Thu Feb 3 14:25:18 2011 |
Frank | Summary | BEAT | Frequency counter time series | 2 stretches of data taken at the following
UTC times:
11/2/2 23:18:19 duration: ~9min |
|
|
470
|
Fri Feb 4 01:03:47 2011 |
Frank | DailyProgress | BEAT | cable delay setup | changed the frequency noise readout to
the cable-delay version to see how it works.
|
|
|
471
|
Fri Feb 4 13:59:48 2011 |
Frank | DailyProgress | BEAT | trend of the setup | This setup has too much gain (i.e.
not enough range). Please |
|
|
472
|
Fri Feb 4 19:26:50 2011 |
Frank | DailyProgress | BEAT | changed to shorter cable | exchanged the 500ft spool by a shorter
cable to get more range (but less resolution).
Due to the lower losses of the cable |
|
|
474
|
Mon Feb 7 15:38:38 2011 |
Frank | Notes | BEAT | cable phase noise measurement stopped | stopped taking data for data calibration
at 11/02/07 23:35:00 UTC |
|
|
475
|
Mon Feb 7 16:14:19 2011 |
Frank | Notes | BEAT | cable phase noise measurement calibration | used two frequency ranges to calibrate
the mixer signal
calibration factor is |
|
|
480
|
Tue Feb 8 10:41:59 2011 |
Frank | Summary | BEAT | cavity drift within 24h | i analyzed the data taken with the
short cable and compared it to the signal
from the tuning input to the VCO. |
|
|
483
|
Wed Feb 9 02:07:25 2011 |
Frank,Tara | DailyProgress | BEAT | long-term frequency drift/noise - once more | Changed the setup to be used with two different
cables at the same time, but only using one
right now. |
|
|
485
|
Wed Feb 9 19:57:43 2011 |
Frank | Notes | BEAT | new cable length - calibration data | shorter cable: cable length 62 inches
amplified (DC-coupled) signal from
mixer using SR560, LP@30Hz, gain20 in channel |
|
|
486
|
Thu Feb 10 00:21:55 2011 |
Frank | Summary | BEAT | comparison VCO feedback signal and "cable technique" | data taken at 02/06/2011 10:10:00 UTC,
duration = 24h
updated plots: |
6x |
|
487
|
Thu Feb 10 01:16:42 2011 |
Tara | Notes | BEAT | collection of beat data, H1 arm noise, and SR560 noise | I plot beat noise PSD, with estimated H1
arm noise, and SR560 noise converted to frequency
noise in the current beat measurement. From |
|
|
488
|
Thu Feb 10 12:00:55 2011 |
rana | Notes | BEAT | collection of beat data, H1 arm noise, and SR560 noise | Here's the plot from the H2YAC doc
that explains the idea.
If we can get down to ~1 Hz/rHz at |
|
|
492
|
Fri Feb 11 13:46:20 2011 |
Frank | Notes | BEAT | calibrated error signal vs frequency | plots
are not taking the change of transmitted
PD power when changing VCO frequency into |
|
|
494
|
Fri Feb 11 19:45:49 2011 |
Frank | Notes | BEAT | updated diagram of current cable delay setup | |
|
|
495
|
Fri Feb 11 21:32:25 2011 |
tara | Notes | BEAT | calibrated error signal vs frequency | I checked my below entry, and I found a
mistake in the conversion factor. It should
be ~170 MHz like Frank's result in the quote. |
|
|
497
|
Tue Feb 15 01:02:31 2011 |
Frank | DailyProgress | BEAT | calibration problems? | looks like a fu**** up the data aquisition
with the short cable, but i don't know how.
When trying to calibrate the data |
|