| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1876
|
Fri Jun 20 09:19:41 2014 |
rana | Laser | GYRO | Gyro noise better by 10x *NOPE* | Also, try out using Sujan's median
Welch PSD code to see if it estimates a lower
noise spectrum. Its better when there are |
|
|
1879
|
Sun Jun 22 12:38:44 2014 |
rana | Electronics | GYRO | Marconi noise measurement verification |
But, to be realistic, don't
you have to use 2 Rubidium clocks to make |
|
|
1881
|
Tue Jun 24 10:47:35 2014 |
rana | Electronics | GYRO | Marconi noise measurement verification | That's remarkable. If the gyro signal
can be read out from the 2nd loop error,
with no 2nd loop locking, it means that the |
|
|
1892
|
Fri Dec 19 12:22:37 2014 |
rana | Lab Infrastructure | General | overhead lights | I noticed that some of the ceiling flourescent
lights are out. Since when have these ceiling
lights been out? |
|
|
1893
|
Tue Dec 23 19:58:49 2014 |
rana | Electronics | M2 ISS | M2 bias/readout board evaluation |
Re: the high ON resistance
of the CMOS switches: |
|
|
1907
|
Sun Feb 22 01:49:11 2015 |
rana | Misc | Seismometer | Finding Modal Frequencies of Frame | Rubber handles give too much low pass action
- use the plastic handle of a ball driver
instead. For a more calibrated result, even |
|
|
1921
|
Mon May 11 18:38:14 2015 |
rana | Misc | Seismometer | ANSYS Videos and Building Update | I would expect that there should be 2 more
modes in here, with frequencies between 0.1
and 4 Hz. The lowest mode is the pitch mode |
|
|
1924
|
Wed May 20 21:33:36 2015 |
rana | Misc | Seismometer | Thermal Enclosure concept | We want to make a thermal enclosure for
the seismometer. The attached diagram shows
the concept and I am hereby handing it off |
|
|
1926
|
Mon Jun 1 18:26:01 2015 |
rana | Lab Infrastructure | HVAC | hot spots in lab - hot air coming from Gyro table HEPA | Kate noticed that two spots were hot in
the lab. The east and west ends of the Gyro
optical table. |
|
|
1936
|
Tue Jun 16 17:09:46 2015 |
rana | Misc | Seismometer | Thermal Enclosure concept | Some Foam Notes:
http://built-envi.com/portfolio/hot-box-measurements-of-wall-thermal-performance/
https://en.wikipedia.org/wiki/R-value_(insulation)
I've |
|
|
1938
|
Thu Jun 18 22:24:31 2015 |
rana | Electronics | PD noise | Resistor noise observations,analysis and inference | This is possibly nice, but please replace
the EPS with PDF and make all of the fonts
(including superscripts) larger than the |
|
|
1958
|
Mon Jul 6 08:15:53 2015 |
rana | Misc | TempCtrl | temperature noise plot | Since its hard to find, here is a plot
from Frank Siefert from years ago, showing
the temperature fluctuations in a metal box |
|
|
1959
|
Mon Jul 6 13:27:48 2015 |
rana | Misc | Seismometer | Inverted Pendulum links | Inverted Pendulum links:
http://dx.doi.org/10.1063/1.1149783
http://dx.doi.org/10.1016/j.nima.2007.08.161
https://en.wikipedia.org/wiki/Inverted_pendulum
|
|
|
1983
|
Fri Jul 17 18:12:36 2015 |
rana | Misc | PD noise | PD noise update | something seems bogus here...the suppression
at 1 Hz is much more than the open loop gain.
usually this is mathematically impossible... |
|
|
1988
|
Fri Jul 24 17:59:39 2015 |
rana | Misc | Seismometer | Mini thermal enclosure test | I've ordered some thermal paste (should
show up at the 40m on Wednesday) for the
thermistors and 2 silicone heaters for the |
|
|
2011
|
Tue Jan 5 14:48:08 2016 |
rana | SafetyLab Infrastructure | HVAC | heating and cooling | As noticed by Kate a few times last year,
the north side of the lab has hot air comiing
out of the HEPA vents and the south side |
|
|
2026
|
Sun Feb 21 14:27:24 2016 |
rana | Misc | PD QE | Measurement of the enhanced QE of the PD without glass window | My interpretation of this is that we get
~2% increase in the peak EQE for p-pol by
doing the extra bounce. Is that correct? |
|
|
2058
|
Wed Aug 3 18:46:13 2016 |
rana | Misc | Scatterometer | Gathering parts: 1550 nm scatter rig | https://nodus.ligo.caltech.edu:8081/Cryo_Lab/46
This entry from Dmass lists the
high noise diode lasers we had in the cryo |
|
|
2059
|
Mon Aug 8 00:31:59 2016 |
rana | Computing | General | Wiki upgrade | ATF Wiki upgraded to 2016 Isabel version
of Docuwiki. Theme updated to Bootstrap3
using the Extension/Theme plugin updater. |
|
|
2060
|
Mon Aug 8 17:05:28 2016 |
rana | Misc | General | Raspberry Pi beam profiles: possible student project | http://hackaday.com/2015/12/21/raspberry-pi-laser-beam-profiler/
UCLA project. Should we try to
make one of these? |
|
|
2065
|
Tue Sep 20 22:19:54 2016 |
rana | Misc | Scatterometer | Gathering parts: 1550 nm scatter rig | I'd make a beam with a 0.5 mm waist
in the sample and then translate the sample
around so that we could measure scatter at |
|
|
2068
|
Wed Oct 5 10:50:24 2016 |
rana | Laser | Fiber | frequency noise | This is a nice plot from https://doi.org/10.1364/OE.18.022781 (Kenji's
laser noise paper) comparing the frequency
noise of different papers. Worth comparing |
|
|
2076
|
Thu Dec 8 20:43:44 2016 |
rana | Lab Infrastructure | General | Lab flooding and AC control issues | Need to have a couple of room temperature
sensors logged into the frames so that we
can do long term lookback of the lab temperature. |
|
|
2080
|
Tue Jan 3 20:15:12 2017 |
rana | Laser | TMTF | fiber based laser phase noise measurements | The Folks at IIT Madras (Deepa, Shanti,
and Anil) recommend making a heterodyne measurement
instead to get away from the 1/f noise in |
|
|
2084
|
Sat Jan 28 13:02:40 2017 |
rana | Things to Buy | CDS | cheap DAQ | Some more cheap DAQ interfaces, whether
for coffee or in the labs without CyMac:
https://labjack.com/ |
|
|
2087
|
Wed Apr 19 10:57:42 2017 |
rana | Laser | GYRO | laser to Liyuan | NPRO from Gyro table lent to Liyuan for
cavity ringdown / contamination tests. |
|
|
2089
|
Thu Apr 20 13:26:23 2017 |
rana | Laser | TMTF | DET-10 thoughts | The DET-10D
is an extended InGaAs photodiode which is
biased either using a battery or an external |
|
|
2092
|
Wed Apr 26 18:40:30 2017 |
rana | Computing | General | ATF Wiki updated | to 2017-02-19b
"Frusterick Manners" +CAPTCHA +Wrap |
|
|
2108
|
Tue May 23 15:19:48 2017 |
rana | Lab Infrastructure | RF | 10 MHz reference distribution system planning | This is pretty close, but for the section
that runs down from the cable tray to the
breakout box, it needs to be |
|
|
2110
|
Tue May 23 16:59:39 2017 |
rana | Lab Infrastructure | RF | 10 MHz reference distribution system planning | FULLY ENCLOSED!!!!! less Mickey Mouse |
|
|
2142
|
Thu Jul 20 18:16:33 2017 |
rana | Update | WOPO | Photodetector Dark Noise | Ugh - I deleted those 1000 bad plots. Just
give us 1 trace per PD, all on one plot.
Each trace should also include the model |
|
|
2148
|
Mon Jul 24 22:28:51 2017 |
rana | Misc | General | ELOG word wrap | I'm annoyed by the elog word
wrapping. It seems to only happen in the
ATF log, probably due to a misconfig in some |
|
|
2153
|
Fri Jul 28 11:16:58 2017 |
rana | Misc | General | ELOG word wrap | Terrible
word wrapping problem fixed by putting actual |
|
|
2155
|
Mon Aug 7 15:09:35 2017 |
rana | DailyProgress | Scatterometer | Calibrating the Camera | Fonts too
small - and theres no such thing as
negative BRDF. |
|
|
2183
|
Sun Nov 5 15:12:06 2017 |
rana | Summary | Computing | diaggui on Mac laptops | Its
now possible to install DTT (aka diaggui) |
|
|
Draft
|
Sun Dec 10 04:48:59 2017 |
rana | Computing | General | dokuwiki updated | I updated the ATFwiki to the latest version
of dokuwiki. backup is in the usual place
on nodus. |
|
|
2199
|
Wed May 23 20:38:10 2018 |
rana | Summary | WOPO | Transformer coupled photodiodes | What is going on with this fossilized squeezing
experiment? I reckon that there is a loss
diagram out there somewhere. Le'ts see |
|
|
2208
|
Fri Jun 29 17:33:44 2018 |
rana | DailyProgress | 2micronLasers | Power Loss in Fiber Optic Cable | In order to pick a length, we'll have
to go beyond this optimization and consider
cost and |
|
|
2235
|
Mon Aug 13 01:48:48 2018 |
rana | DailyProgress | WOPO | SR560 battery as a voltage supply | When powering from the SR560 bananananas,
you should disconnect AC power, else it may
produce extra lines due to the charger. |
|
|
2236
|
Mon Aug 13 01:53:21 2018 |
rana | DailyProgress | WOPO | zero-span spec OR RF bandpass | I know the squeezing people often use the
zero-span feature of a spectrum analyzer
to produce their McDonalds plots, but why |
|
|
2308
|
Wed Mar 20 19:17:50 2019 |
rana | Noise Budget | 2micronLasers | Noise budget for the frequency discriminator | I think the dark noise should be very close
to the shot noise and also have the same
transfer function. |
|
|
2325
|
Wed Apr 10 18:58:48 2019 |
rana | Update | 2micronLasers | Intensity noise stabilization of 2 micron source | OK...but how will the amplitude stabilization
be done? How about a diagram showing the
feedback loop and electronics? |
|
|
2326
|
Thu Apr 11 20:50:17 2019 |
rana | Howto | General | how to learn quickly | https://maglab.caltech.edu/human-magnetic-reception-laboratory/ |
|
|
2330
|
Wed Apr 24 19:30:55 2019 |
rana | Lab Infrastructure | HVAC | howto get temperature trends | We need to get the temperature
data from the sensors |
|
|
2334
|
Sun May 5 20:52:16 2019 |
rana | Noise Budget | 2micronLasers | Frequency noise measurement of 2 micron source | Looks good! A few comments:
The LPF should be a 1.9
MHz LP from Mini-circuits
The |
|
|
2335
|
Sun May 5 20:58:20 2019 |
rana | Lab Infrastructure | HVAC | howto get temperature trends | the temperature has stabilized, although
the fact that there is a sign error in one
of the HVAC actuators means that there is |
|
|
2339
|
Fri May 10 18:39:10 2019 |
rana | Lab Infrastructure | HVAC | howto get temperature trends | Modesto came back this morning. We were
still getting 1 hot blower and 1 cold blower.
As it turned out, although hot |
|
|
2341
|
Tue May 14 13:10:36 2019 |
rana | Lab Infrastructure | HVAC | HVAC debuggin | fixed (?) HVAC problems (~1700 Monday)
by better attaching a pneumatic hose that
actuates the hot water flow for the south |
|
|
2365
|
Tue Jun 25 19:56:23 2019 |
rana | Electronics | Cleanliness | Moku Out | I've removed the Moku and its iPad
from the lab to see what its up to noise-wise. |
|
|
2380
|
Tue Jul 30 20:42:06 2019 |
rana | DailyProgress | 2micronLasers | Noise Analysis of Circuit using SR785 Spectrum Analyser and Zero Simulation | Oh
no! We've lost all of the low frequency |
|