| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
944
|
Fri Apr 27 08:57:38 2012 |
steve | Notes | Purchases | vibration isolators (table legs) in 40m | Those are the ones we are using right now
and break after some while because they are
too old (the rolling rubber diaphragm is |
|
|
943
|
Fri Apr 27 08:46:24 2012 |
Frank | Notes | optic | windows for vacuum chamber | cavity mirrors are parallel to the end
surface of the chamber (not completely, but
pretty close; changes every time we touch |
|
|
942
|
Thu Apr 26 16:57:33 2012 |
steve | Notes | Purchases | vibration isolators (table legs) in 40m |
|
|
|
941
|
Thu Apr 26 12:15:13 2012 |
Frank | Notes | Purchases | vibration isolators (table legs) | The price for the custom made legs are
$ 9295, and for the standard 16" are
$ 3710 |
|
|
940
|
Thu Apr 26 08:35:57 2012 |
steve | Notes | optic | windows for vacuum chamber |
|
|
|
939
|
Wed Apr 25 15:15:03 2012 |
tara | Notes | Laser | borrow NPRO from TNI | Duly noted, I'll write the sop for this
one and put it on svn and wiki.
|
|
|
938
|
Wed Apr 25 10:44:29 2012 |
Frank | Notes | optic | windows for vacuum chamber | I don't know how you gonna make the knife
edge on the 10" flange of centered and
wedged! If you put the small CF flanges on |
|
|
937
|
Wed Apr 25 10:23:34 2012 |
Frank | Notes | Purchases | vibration isolators (table legs) | We have "Pneumatic Vibration Isolators
with Automatic Re-leveling". Height
is 16in from top to bottom, so that would |
|
|
936
|
Wed Apr 25 10:13:55 2012 |
Frank | Notes | Laser | borrow NPRO from TNI | Don't forget to write an SOP for that laser
before using it. A few things changed recently
if you want to use the old SOP as an template. |
|
|
935
|
Tue Apr 24 22:10:45 2012 |
tara | Notes | Electronics Equipment | modified UPDH | [Frank, Tara]
We
checked the input referred noise of the UPDH |
|
|
934
|
Tue Apr 24 22:07:10 2012 |
tara | Notes | Laser | borrow NPRO from TNI | I borrow an NPRO from TNI. The model is
similar to what we have, but I think the
maximum power is 500mW (what we have is 100mW). |
|
|
933
|
Mon Apr 23 22:06:14 2012 |
tara | Notes | Purchases | vibration isolators (table legs) | I'm looking for the new table legs. The
height will be 13.5". The plate that
connects to the table will have 3 holes, |
|
|
932
|
Mon Apr 23 16:52:16 2012 |
tara | Notes | optic | windows for vacuum chamber | I asked Steve about the choices, he thought
the Thorlabs window should be ok for us.
What |
|
|
931
|
Sun Apr 22 23:09:38 2012 |
tara | Notes | optic | windows for vacuum chamber | For small window option, I can either have
it made from scratch ( based on LIGO's drawing)
or buy the commercial windows from Thorlabs. |
|
|
930
|
Sun Apr 22 22:10:17 2012 |
tara | Notes | Documentation | Proposal is on SVN | The problem is fixed, I just deleted my
local folder, check outed from the svn. Now
when I commit the subversion, it shows up |
|
|
929
|
Sat Apr 21 00:55:00 2012 |
frank, tara | DailyProgress | BEAT | Beat measurement update | We measured the beat after a few changes
in the setup (modulation index, air spring,
small enclosure around the beat). We update |
|
|
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 |
|
|
927
|
Thu Apr 19 19:58:19 2012 |
tara | Notes | Documentation | Proposal is on SVN | The proposal for CTN lab is on SVN.
The original folder was /CTNlab/docs/Proposal.
|
|
|
926
|
Thu Apr 19 03:12:23 2012 |
tara | Notes | optic | windows for vacuum chamber |
I'm searching DCC for window/viewport
examples. The following drawings give me |
|
|
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 |
|
|
924
|
Wed Apr 18 02:38:59 2012 |
tara | Notes | EOM | Change modulation depth for 14.75MHz EOM | I changed the attenuator to -1dBm. From
a quick measurement, there's no improvement
in the beat signal at high frequency. Any |
|
|
923
|
Wed Apr 18 00:49:07 2012 |
tara | DailyProgress | optic | vibration damping on optics | I planned to measure the beat at night
with the air springs activated, but the power
went out around 11:45 pm. I think the temperature |
|
|
922
|
Tue Apr 17 19:51:54 2012 |
tara | Notes | optic | windows for vacuum chamber | If we go with plan2,
1)window and flange
I think the window size |
|
|
921
|
Mon Apr 16 22:02:08 2012 |
tara | DailyProgress | optic | vibration damping on optics | I forgot to change the code to disable
the air springs, now the seismic coupling
makes more sense. |
|
|
920
|
Mon Apr 16 18:17:05 2012 |
Frank, Tara | Summary | NoiseBudget | mechanical resonances | I was told at JILA that anything less than
3/4" thick is lame.
This place has thick stuff: |
|
|
919
|
Mon Apr 16 16:21:01 2012 |
tara | Notes | optic | windows for vacuum chamber | I'm checking the properties/prices/availability
of window for the vacuum chamber.
|
|
|
918
|
Mon Apr 16 15:35:15 2012 |
Frank, Tara | Summary | NoiseBudget | mechanical resonances | we mapped the mechanical resonances in
our system using two techniques :
tapping each optical component |
|
|
917
|
Mon Apr 16 03:42:39 2012 |
Frank | Notes | Purchases | acoustic insulation | ordered thin (1in) t-channel aluminum frame
parts from mcmaster (similar to bosch framing,
but cheaper, link) |
|
|
916
|
Mon Apr 16 02:20:58 2012 |
tara | DailyProgress | optic | vibration damping on optics | I measured beat signal, after damping most
of the optics, realigning the beams to the
cavities, measured the slope of error signals |
|
|
915
|
Sat Apr 14 06:03:23 2012 |
frank,tara | DailyProgress | optic | vibration damping on optics | We are damping most of the optics
with rubber cones. There are a few peaks
that we still could not find their origins. |
|
|
914
|
Sat Apr 14 01:10:48 2012 |
tara | Notes | EOM | Change modulation depth for 14.75MHz EOM | I increased the power to the 14.75MHz EOM
from 0.5 dBm to 3.5 dBm. This was done by
changing the attenuator from -6dBm to -3dBm. |
|
|
913
|
Fri Apr 13 13:35:37 2012 |
Tara, Frank | Summary | NoiseBudget | PDH readout noise level verification | we re-checked the electronic noise level
for each PDH loop and also checked how the
noise level rises with a shot noise limited |
|
|
912
|
Fri Apr 13 03:15:12 2012 |
koji,frank,tara | DailyProgress | optic | vibration damping on optics | We tried to damp mechanical peaks from
each optics. For now, by putting a rubber
piece on a mirror mount can suppress mechanical |
|
|
911
|
Thu Apr 12 22:22:12 2012 |
frank, tara | DailyProgress | NoiseBudget | Electronic noise + shot noise verification | We measured shot noise level with white
light source. The noise level is slightly
off from shot noise calculation in the noise |
|
|
910
|
Thu Apr 12 13:58:17 2012 |
Frank | DailyProgress | NoiseBudget | low frequency noise source | |
|
|
909
|
Wed Apr 11 20:30:50 2012 |
frank, tara | DailyProgress | NoiseBudget | Electronic noise verification | We are checking the noise contribution
from electronics readout of our system to
get better noise budget estimation. We added |
|
|
908
|
Wed Apr 11 14:31:52 2012 |
Frank | DailyProgress | NoiseBudget | low frequency noise source | i have identified part of the low frequency
noise source from yesterdays measurement
- air fluctuations. We still had the HEPA |
|
|
907
|
Wed Apr 11 14:22:47 2012 |
Frank | Notes | Laser | laser shutdown | pulling the switch for one of the HEPA
fans triggered the laser and put it in standby
mode - turned laser back on |
|
|
906
|
Wed Apr 11 02:44:29 2012 |
frank, tara | DailyProgress | optic | bad PBS | Update, beat measurement after several
optics replacement. Peaks around 10 Hz, 35
Hz show up this time. |
|
|
905
|
Tue Apr 10 00:50:56 2012 |
frank, tara | DailyProgress | optic | bad PBS | We noticed wide angle scattered light behind
the PBS in front of RCAV. The scattering
source is probably the curved mirror behind |
|
|
904
|
Mon Apr 9 23:05:44 2012 |
tara | DailyProgress | Seismic | Seismic coupling from curtain frame to beat | Ting's code for new coating thermal noise
is attached. This is the code used for the
calculation in their paper (not published |
|
|
903
|
Sun Apr 8 23:35:05 2012 |
tara | DailyProgress | Seismic | Seismic coupling from curtain frame to beat | I used ciplot command to plot the
noise budget with confidence region.
|
|
|
902
|
Fri Apr 6 01:36:39 2012 |
Tara, Frank | Summary | NoiseBudget | ACAV loop changes | summary of all changes made and more detailed
plots will be posted soon, so check back
later |
|
|
901
|
Fri Apr 6 01:07:47 2012 |
tara | DailyProgress | NoiseBudget | Thermoelastic noise from substrate | I corrected the code for substrate thermoelastic
noise (TE) in my noise budget. The substrate
thermoelastic of 8 inch cavity will not be |
|
|
900
|
Fri Apr 6 01:03:01 2012 |
frank, tara | DailyProgress | BEAT | ground loop problem | We fixed the ground loop problem in ACAV
setup and got rid of most of the harmonic
lines in beat signal. |
|
|
899
|
Fri Apr 6 00:34:28 2012 |
rana | HowTo | NoiseBudget | scattered light hunting | How
to find parasitic scatterers by
the GEO600 gang. |
|
|
898
|
Wed Apr 4 23:58:43 2012 |
tara | Notes | NoiseBudget | thermal noise from spacer + support | Following the calculation from Kessler,
I estimated brownian noise from the spacer
and the o ring support from our setup. From |
|
|
897
|
Wed Apr 4 18:57:11 2012 |
rana | DailyProgress | Seismic | Seismic coupling from curtain frame to beat | http://lmgtfy.com/?q=matlab+ciplot |
|
|
896
|
Tue Apr 3 20:56:10 2012 |
frank, tara | DailyProgress | Seismic | Seismic coupling from curtain frame to beat | We measured the beat signal after we fixed
the wiring problem. We are close to what
we had before, but we still have a scattering |
|