| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
107
|
Tue Apr 13 18:23:41 2010 |
Tara Chalermsongsak | Electronics | | TF of PDH Box | I measured TF of PDH box, D0901351, (The
one we have was modified). This box sends
the signal to VCO. |
|
|
109
|
Fri Apr 16 10:45:04 2010 |
Tara Chalermsongsak | Electronics | | Control Loop for PSL | This is the control loop for the current
PSL setup.
There are still components to be |
|
|
110
|
Wed Apr 21 15:21:52 2010 |
Tara Chalermsongsak | Electronics | | TF of PDH Box | I calculated the TF of the modified PDH
box and fit it with the measurement. The
comparison does not match perfectly. I'll |
|
|
111
|
Wed Apr 21 15:39:46 2010 |
rana | Electronics | | TF of PDH Box |
Use LISO for circuit simulation. |
|
|
113
|
Mon May 3 15:47:58 2010 |
Tara Chalermsongsak | Electronics | | TF of PDH Box | The values of some r
and c in the circuit are corrected, I used
wrong values last time ( details will be |
|
|
161
|
Tue Jun 15 09:44:56 2010 |
tarac | Electronics | | PMC servo TF |
The weird TF result from PMC seems to be
the result of the insufficient voltage input. |
|
|
162
|
Tue Jun 15 10:14:32 2010 |
Frank | Electronics | | PMC servo TF | that's not the TF of the PMC servo, it's
something else. look at the gain level: -100dB.
that's not more than some crosscoupling. |
|
|
163
|
Tue Jun 15 13:36:18 2010 |
tarac | Electronics | | debugging PMC servo | From the
bode plot, something is not quite right.
I'll debug the PMC servo. My plan is |
|
|
237
|
Mon Jul 26 22:14:39 2010 |
Megan | DailyProgress | | Daily Update | Today I aligned the AOM so that I could
align the analyzer cavity to lock the cavity.
We already aligned and locked the PMC last |
|
|
238
|
Wed Jul 28 19:46:46 2010 |
Megan | DailyProgress | | PSL Progress! | The PMC is still locked (except when we
do something to unlock it) and both the analyzer
cavities and reference cavities have the |
|
|
239
|
Wed Jul 28 19:47:58 2010 |
Megan | Notes | | Slow actuator calibration | For future people searching in the elog,
calibration for the slow actuator is 1182
MHz/V. Or for the temperature actuator. Whichever |
|
|
249
|
Mon Aug 2 12:16:04 2010 |
Megan | Notes | | VCO Model on SVN | The model I made of the VCO is now on the
svn, in the filter folder in liso, listed
as VCODriverNoise.fil |
|
|
251
|
Tue Aug 3 11:22:04 2010 |
Megan | DailyProgress | | PSL Table Updates | Both the analyzer cavity and reference
cavity are able to be locked, and were simultaneously
locked for a while yesterday |
|
|
253
|
Wed Aug 4 10:56:04 2010 |
Megan | DailyProgress | | Optics Set Up! | All of the optics were set up in the path
of the transmitted light from both cavities.
Each path needed both a quarter wave plate |
|
|
256
|
Thu Aug 5 11:33:20 2010 |
Megan | DailyProgress | | BluePhase 1000 | The cavities were still too far off to
lock simultaneously, but they should hopefully
be better today. |
|
|
258
|
Fri Aug 6 11:51:47 2010 |
Megan | DailyProgress | | VCO Measurements | Yesterday we set up channels to record
the noise of the locked signal generators.
After a while playing with channels and filters |
|
|
269
|
Tue Aug 10 21:40:42 2010 |
Megan and Frank | DailyProgress | | Both Cavities Locked! | We
g |
|
|
278
|
Fri Aug 13 11:06:10 2010 |
Megan | DailyProgress | | New Layer of Foam for the Cavities | We were going to work on building a metal
box around the cavities, but they didn't
have enough sheet metal and would have to |
|
|
281
|
Fri Aug 13 17:03:13 2010 |
Megan | Photos | | The Foam Box | The new foam box has a hat! Or lid... Whichever
you prefer.
|
|
|
286
|
Tue Aug 17 14:52:57 2010 |
Frank | Photos | | beat setup panorama picture incl beams | |
|
|
288
|
Tue Aug 17 18:54:19 2010 |
Frank | Notes | | list of current problems and things to do | - personal notes -
tiny, periodic spikes
in acav RF PD
~36MHz oscillation |
|
|
289
|
Wed Aug 18 00:07:37 2010 |
Frank | DailyProgress | | noise level of beat signal | i tried a couple of things today to figure
out what determines the low frequency noise
level of the beat measurement. |
|
|
290
|
Wed Aug 18 03:15:20 2010 |
rana | Photos | | beat setup panorama picture incl beams | The panorama is a good idea. We should
make it a mandatory step whenever we make
any change to the setup. |
|
|
291
|
Wed Aug 18 12:19:17 2010 |
Frank | Photos | | beat setup panorama picture incl beams | i know the the asymmetry is not nice but
we made the first beat setup symmetric and
suffered a lot from the (former) little space |
|
|
342
|
Sun Sep 5 19:41:45 2010 |
tara | DailyProgress | | Faraday Isolator added | Frank showed me that the RIN level
from PMC is too high and caused by back reflection.
PMC's psd is reduced by blocking |
|
|
348
|
Thu Sep 9 02:20:32 2010 |
tara | Notes | | problem about PBS/QWP | We have used an instant PBS/QWP which is
a PBS optically contacted to an aligned QWP
in front of a reference cavity |
|
|
347
|
Thu Sep 9 02:20:32 2010 |
tara | Notes | | problem about PBS/QWP | We have used an instant PBS/QWP which is
a PBS optically contacted to an aligned QWP
in front of a reference cavity |
|
|
502
|
Wed Feb 16 21:29:17 2011 |
tara | Notes | | perl script for SLOWDC PID control added | A perl script/ an medm screen are
created for SLOWDC PID control. The gain
is not optimized yet. Some debugging might |
|
|
608
|
Tue May 31 19:01:12 2011 |
tara | Notes | | Plan for FSS | I listed some issues for FSS experiment
that we should discuss within this week and
other small details. |
|
|
650
|
Wed Aug 3 22:30:22 2011 |
tara | Notes | | Plan for new setup | As Koji suggested, I list out the
plans which will be implemented in the setup
and why do we want it. Comments and suggestions |
|
|
667
|
Wed Sep 7 22:41:44 2011 |
frank,tara | DailyProgress | | Two cavities are in the same chamber | We put two cavities in
the same chamber. Next, we will measure the
frequency difference between the two cavities |
|
|
691
|
Mon Oct 3 23:54:19 2011 |
frank, tara | DailyProgress | | re mode matching | As the cavities' height changed, I adjusted
the lenses to fine tune the mode matching
for RCAV, the visibility is ~85% |
|
|
693
|
Tue Oct 4 23:20:57 2011 |
frank, tara | DailyProgress | | re mode matching |
I readjusted the lenses for
mode matching a bit more and the visibility |
|
|
1536
|
Tue Dec 16 21:31:21 2014 |
Kate | DailyProgress | | Minor changes to layout of cavity transmitted path | Evan, Kate
We made a few minor modifications
to the optical breadboard in transmission |
|
|
1537
|
Wed Dec 17 20:30:36 2014 |
Aidan, Evan | DailyProgress | | Minor changes to layout of cavity transmitted path |
|
|
|
1684
|
Tue Jul 26 11:21:53 2016 |
awade and Antonio | DailyProgress | | Initial search for beat note refcavs' beatnote | With cavities mode matched and PDH locked
on reflection we are now looking to find
the beat notes between the two separate cavity-laser |
|
|
1687
|
Tue Jul 26 12:56:13 2016 |
Koji | DailyProgress | | Initial search for beat note refcavs' beatnote | How about this procedure?
- Build a temporary beat setup
before the cavities. Use 1GHz New Focus InGaAs |
|
|
2141
|
Thu Mar 15 22:50:58 2018 |
Shu Fay Ung | Summary | | helping to upgrade lab data acquisition system | Hi, I'm an undergrad and I'll be
helping to upgrade the lab data acquisition
system. I'm starting off with getting |
|
|
2144
|
Sun Mar 18 10:17:16 2018 |
Shu Fay | Summary | | Plotting program quickplot.py | quickplot.py makes quick plots of data
from desired channels. See: https://github.com/shufay/LIGO-plots.
On ws1 cd to ~/Git/LIGO-plots. In |
|
|
58
|
Mon Feb 8 18:08:53 2010 |
Frank | Misc | AOM | thermal images of AOM | took some images with the thermal imaging
camera of the AOM installed in the PSL so
far. The first three pictures show the AOM |
9x |
|
59
|
Mon Feb 8 18:12:46 2010 |
Frank | Notes | AOM | impedance measurements | measured the impedance from 70MHz to 90MHz
for three different AOMs we had in the lab
- two Isomet 1205C-843 and one Crystal Technologies |
|
|
633
|
Thu Jul 21 18:03:20 2011 |
tara | DailyProgress | AOM | AOM adaptor plate, | I made drawings for aom block and adaptor
plate. The assembly is for 3" beam height.
|
|
|
635
|
Fri Jul 22 16:31:12 2011 |
tara | DailyProgress | AOM | AOM adaptor plate |
As Frank suggested, I edited
the drawing, so that the adaptor plate can |
|
|
655
|
Wed Aug 10 20:54:58 2011 |
tara | DailyProgress | AOM | Changing Crystal Tech AOM to Isomet AOM | [koji, frank, tara]
Today we changed the AOM in RCAV
setup from Crystal Tech AOM to Isomet AOM. |
|
|
1024
|
Thu Jul 19 23:55:48 2012 |
tara | Notes | AOM | ellipticity of the beam through AOM | I'm optimizing the AOM to make sure that
we have max power, and to minimize pointing
due to frequency change, and minimize ellipticity |
|
|
1599
|
Thu Oct 29 20:14:33 2015 |
Antonio | DailyProgress | AOM | EAOM removed | In order to debug the intensity noise that
I found after the installation of the EAOM
in the South path I have removed it from |
|
|
1601
|
Sat Oct 31 21:24:19 2015 |
Antonio | DailyProgress | AOM | EAOM implemented in the South path again (2) | The
EAOM is again in place but not the lambda/4 |
|
|
945
|
Fri Apr 27 10:30:57 2012 |
Frank | Notes | Acoustics | acoustic damping from plexiglas and sandwich structures | sandwich structures using plexiglas : "Damped
Windows for Aircraft Interior Noise Control"
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.79.9176 |
|
|
948
|
Tue May 1 03:12:58 2012 |
frank, tara | DailyProgress | Acoustics | acoustic enclosure for input beam | We started making the acoustic enclosure
around the input beam area (second half of
the table, before the chamber). The frame |
|
|
950
|
Tue May 1 23:58:21 2012 |
frank, tara | DailyProgress | Acoustics | acoustic enclosure for input beam | We added the lid on top of the enclosure.
More work is needed to complete the box.
We made the closing |
|