| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
4167
|
Wed Jan 19 04:25:54 2011 |
Kevin | Update | Electronics | POX Transfer Functions | I redid the optical POX transfer functions
and updated the wiki at http://lhocds.ligo-wa.caltech.edu:8000/40m/Electronics/POX.
I measured each transfer function |
|
|
4170
|
Wed Jan 19 17:00:23 2011 |
Kevin | Update | Electronics | POX Transfer Functions | The value of I_dc was a mistake.
The value should be 240 µA.
The widths of the resonance peaks |
|
|
4172
|
Thu Jan 20 01:50:30 2011 |
Kevin | Update | Electronics | POX Transfer Functions | [Koji, Kevin]
We fit the entire POX optical transfer
function from 1 MHz to 500 MHz in LISO. The |
|
|
4210
|
Thu Jan 27 03:24:56 2011 |
Kevin | Update | Electronics | POY Optical Transfer Function | [Rana and Kevin]
I measured the optical transfer function
of POY and fit the data using LISO. The fit |
|
|
4242
|
Thu Feb 3 01:46:54 2011 |
Kevin | Update | Electronics | POY Shot Noise and Dark Spectrum | [Koji and Kevin]
I measured the shot noise of POY
and fit the data to determine the RF transimpedance |
|
|
4347
|
Thu Feb 24 00:54:33 2011 |
Kevin | Update | Electronics | Calculated Dark Noise for POX and POY | [Kevin, Rana, Koji]
I calculated the dark noise of POX
and POY due to Johnson noise and voltage |
|
|
4370
|
Wed Mar 2 22:04:22 2011 |
Kevin | Update | Electronics | POY Shot Noise Measurement | The previous measurement for the shot noise
of POY had the dark noise at ~100 nV/rtHz.
I redid the measurement and got 26 nV/rtHz |
|
|
4395
|
Thu Mar 10 01:31:37 2011 |
Kevin | Update | Electronics | AS55 Characterizations | I measured the transfer function, shot
noise, and dark spectrum of AS55.
From the shot noise measurement, |
|
|
13272
|
Wed Aug 30 06:45:32 2017 |
Kevin | Summary | PEM | New Heater Circuit | I changed the heater circuit described
in this
elog to a current sink. The new and old |
|
|
13489
|
Wed Dec 20 00:43:58 2017 |
Kevin | Summary | General | DAC noise contribution to squeezing noise budget | Gautam and I looked into the DAC noise
contribution to the noise budget for homodyne
detection at the 40m. DAC noise is currently |
|
|
13490
|
Thu Dec 21 19:25:48 2017 |
Kevin | Summary | General | DAC noise contribution to squeezing noise budget | Gautam and I redid our calculations, and
the updated plot of squeezing as a function
of DAC current noise per coil is shown in |
|
|
13508
|
Sat Jan 6 05:18:12 2018 |
Kevin | Update | PonderSqueeze | Displacement requirements for short-term squeezing | I have been looking into whether we can
observe squeezing on a short timescale. The
simulations I show here say that we can get |
|
|
13511
|
Sat Jan 6 23:25:18 2018 |
Kevin | Update | PonderSqueeze | Displacement requirements for short-term squeezing |
|
|
|
13513
|
Sun Jan 7 11:40:58 2018 |
Kevin | Update | PonderSqueeze | Displacement requirements for short-term squeezing | Yes, this SRC detuning is very close to
extreme signal recycling (0° in this
convention), and the homodyne angle is close |
|
|
13724
|
Fri Mar 30 22:37:36 2018 |
Kevin | Update | IOO | MCREFL_PD Optical response measurement | [Gautam, Kevin]
We redid the measurement measuring
the voltage noise from the REFL PD demod |
|
|
13728
|
Thu Apr 5 04:36:56 2018 |
Kevin | Update | IOO | Coil driver noise | [Gautam, Kevin]
We measured the MC coil driver
noise at the output monitors of the coil |
|
|
13738
|
Fri Apr 6 22:23:53 2018 |
Kevin | Update | IOO | Coil driver noise |
|
|
|
13755
|
Mon Apr 16 22:09:53 2018 |
Kevin | Update | General | power outage - BLRM recovery | I've been looking into recovering the
seismic BLRMs for the BS Trillium seismometer.
It looks like the problem is probably |
|
|
13763
|
Wed Apr 18 20:33:19 2018 |
Kevin | Update | General | seismometer interfaces | Steve, the pictures you posted are not
the AA board I was referring to. The attached
pictures show the board which is sitting |
|
|
13777
|
Fri Apr 20 23:36:28 2018 |
Kevin | Update | PEM | Seismometer BLRMs | Steve secured the GPS time server in the
rack above the AA board and removed the wooden
block that it was resting on. The new rack |
|
|
13787
|
Tue Apr 24 21:19:08 2018 |
Kevin | Update | PEM | Seismometer BLRMs | In the ongoing attempt to recover the seismometer
BLRMS, I removed the AA board from the rack
and modified the BS seismometer Z channel. |
|
|
13790
|
Thu Apr 26 09:35:49 2018 |
Kevin | Update | PEM | PEM Anti-Alias wiring | I wired all 32 channels going to the AA
board directly to the ADC as described in
the previous |
|
|
13794
|
Thu Apr 26 20:22:21 2018 |
Kevin | Update | PEM | ADC common mode rejection with new seismometer connections | Yesterday I wired the outputs from the
seismometers directly to the ADC input bypassing
the old AA board circuit as is described |
|
|
13801
|
Mon Apr 30 23:13:12 2018 |
Kevin | Update | Computer Scripts / Programs | DataViewer leapseconds | I was trying to plot trends (min, 10 min,
and hour) in DataViewer and got the following
error message |
|
|
13808
|
Thu May 3 00:42:38 2018 |
Kevin | Update | PonderSqueeze | Coil driver contribution to squeezing noise budget | In light of the discussion at today's
meeting, Guantanamo and I looked at how the
series resistance for the test mass coil |
|
|
13841
|
Mon May 14 18:58:32 2018 |
Kevin | Update | PonderSqueeze | Squeezing with no SRM |
Quote:
|
|
|
13849
|
Wed May 16 21:02:22 2018 |
Kevin | Update | PEM | ADC common mode rejection with new seismometer connections | As described in this
elog, the ADC for the seismometers now
has the signals wired directly to the ADC |
|
|
13850
|
Wed May 16 21:47:17 2018 |
Kevin | Update | PEM | Seismometer Noise Spectra | Earlier today Kira and I reconnected the
EX seismometer. I just took some spectra
of all three seismometers, shown in the attachments, |
|
|
1933
|
Fri Aug 21 17:28:50 2009 |
Kevin, rana | Summary | PEM | Magnetic Field Measurements Around the Lab |
|
|
|
13183
|
Thu Aug 10 14:13:23 2017 |
Kira | Summary | PEM | temperature sensor | Goal is to build a temperature sensor accurate
to 1 mK. Schematic is shown below. This does
not take into account the DC gain that occurs. |
|
|
13184
|
Thu Aug 10 14:14:17 2017 |
Kira | Update | PEM | previously built temp sensor | I decided to see what was inside the sensor
that had been previously made. According
to elog 1102, the temperature sensor is LM34, |
|
|
13190
|
Fri Aug 11 10:27:49 2017 |
Kira | Update | PEM | temperature sensor | Since there seems to be little difference
between AD590 and AD592, I guess we could
just go with the AD590. The temperature noise |
|
|
13191
|
Fri Aug 11 10:48:39 2017 |
Kira | Update | PEM | temperature sensor | Quick update: we actually have AD587KRZ
and AD592, so we could start by using that
and seeing how it works. |
|
|
13194
|
Fri Aug 11 12:27:25 2017 |
Kira | Update | PEM | temperature sensor | Used AD592CNZ and AD586 (5V output) to
create a circuit that works and is responsive
to temperature changes. At room temp, using |
|
|
13202
|
Mon Aug 14 09:49:18 2017 |
Kira | Update | PEM | temperature sensor | Decided to try adding in an OP amp just
to see if it would work. Added LT1012
and a 100k resistor to the circuit (I originally |
|
|
13203
|
Mon Aug 14 12:52:33 2017 |
Kira | Update | PEM | temperature sensor | I didn't realize that the LT1012 needed
an additional input to function. I added
in +15V and -15V to pins 7 and 4, respectively and |
|
|
13209
|
Tue Aug 15 11:50:21 2017 |
Kira | Summary | PEM | temp sensor packaging/mount | For the final packaging/mounting of the
sensor to the seismometer, I have thought
of two options. |
|
|
13210
|
Tue Aug 15 13:32:38 2017 |
Kira | Update | PEM | temperature sensor | Tested to make sure that even when only
the AD586 was heated that there was no change
in the reading. I did so by placing the AD586 |
|
|
13214
|
Wed Aug 16 16:05:53 2017 |
Kira | Update | PEM | temp sensor PCB | Tried taking the circuit from the breadboard
to the PCB. I attached all the components
to adapters that would allow them to be connected |
|
|
13224
|
Thu Aug 17 10:41:58 2017 |
Kira | Update | PEM | temp sensor PCB | Got it to work. One of the connections
was faulty. I decided to check the temperature
measured against a thermometer. The sensor |
|
|
13232
|
Mon Aug 21 13:07:08 2017 |
Kira | Update | PEM | temp sensor PCB | On Friday, I cleaned up the circuit so
that there are only three connections needed
(+15V, -15V, GND) and a BNC connector for |
|
|
13269
|
Tue Aug 29 15:41:17 2017 |
Kira | Summary | PEM | heater circuit | I worked with Kevin and Gautam to create
a heater circuit. The first attachment is
Kevin's schematic of the circuit. The |
|
|
13285
|
Fri Sep 1 15:46:12 2017 |
Kira | Update | PEM | temp sensor update | I took off the AD590 and attached it to
two long wires leading out from the board.
This will allow us to attach the sensor to |
|
|
13292
|
Tue Sep 5 09:47:34 2017 |
Kira | Summary | PEM | heater circuit calculations | I decided to calculate the fluctuation
in power that we will have in the heater
circuit. The resistors we ordered have 50 |
|
|
13295
|
Tue Sep 5 17:18:17 2017 |
Kira | Update | PEM | temp sensor update | Today, I stuck on the sensors to a metal
block using a flag, rubber bands, and some
thermal paste (1st attachment). I then wrapped |
|
|
13296
|
Tue Sep 5 17:52:06 2017 |
Kira | Update | PEM | temp sensor update | to get the sensors to read the same values
they have to be in direct thermal contact
with the metal block - there can't be |
|
|
13311
|
Tue Sep 12 11:44:16 2017 |
Kira | Update | PEM | temp sensor update | Got it to work. A cable was broken and
the AD586 also broke at the same time so
it took a while to find the problem. I had |
|
|
13419
|
Wed Nov 8 16:39:24 2017 |
Kira | Update | PEM | ADC noise measurement | Gautam and I measured the noise of the
ADC for channels 17, 18, and 19. We plan
to use those channels for measuring the noise |
|
|
13427
|
Tue Nov 14 16:02:43 2017 |
Kira | Summary | PEM | seismometer can testing | I made a model for our seismometer can
using actual data so that we know approximately
what the time constant should be when we |
|
|
13438
|
Tue Nov 21 16:00:05 2017 |
Kira | Update | PEM | seismometer can testing | I performed a test with the can last week
with one layer of insulation to see how well
it worked. First, I soldered two heaters |
|