| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
10104
|
Wed Jun 25 19:29:19 2014 |
Akhil | Update | Electronics | Analog-to-Digital Converter | I have been trying to use an ADC
with the Raspberry Pi to be able to measure
the phase difference between FC input and |
|
|
10107
|
Fri Jun 27 12:54:13 2014 |
Akhil | Update | Electronics | Gain plots of UFC-6000 for 0.1s Sampling Rate | Finally, the 0.1s sampling rate of
the frequency counter(FC) has been achieved.
For this I had to : |
|
|
10118
|
Tue Jul 1 21:20:37 2014 |
Akhil | Update | Electronics | Gain plots of UFC-6000 for 0.1s Sampling Rate | The attached are the gain plots at
carrier frequencies of 100 MHz, 500 MHz and
1 GHz measured using IFR 2023B (Marconi). |
|
|
10129
|
Fri Jul 4 09:17:13 2014 |
Akhil | Configuration | Electronics | Setup Used for Characterization of Frequency Counter | Goal:
To |
|
|
10137
|
Mon Jul 7 13:56:13 2014 |
Akhil | Configuration | Electronics | Setup Used for Characterization of Frequency Counter | When I was trying to plot PSD of the measurements,
I still couldn't get better resolution. There
still seems to be a problem with timing and |
|
|
10151
|
Tue Jul 8 09:02:02 2014 |
Akhil | Update | Electronics | PSD Plots for different sampling times of the Frequency Counter | Although there were few timing issues
with the FC and the Raspberry Pi at the lowest
sampling time of the FC (0.1s) even after |
7x |
|
10161
|
Wed Jul 9 08:50:30 2014 |
Akhil | Update | General | Weekly Update |
Last
Week's Work |
|
|
10163
|
Wed Jul 9 12:01:43 2014 |
Akhil | Configuration | Electronics | Setup Plan for placing the Frequency Counter inside the lab | Today, me and Manasa went inside the lab
to figure out a place for the place for the
FC. The whole setup will be placed in a chassis |
|
|
10178
|
Thu Jul 10 17:53:19 2014 |
Akhil | Configuration | Computer Scripts / Programs | EPICS installed on Raspberry Pi | I finished the installation of EPICS |
|
|
10193
|
Mon Jul 14 13:03:23 2014 |
Akhil | Summary | Electronics | Timing Issues of Mini Circuits UFC-6000: Solved | Main
Problem:
The frequency counter (FC) takes |
|
|
10199
|
Tue Jul 15 01:31:13 2014 |
Akhil | Summary | Electronics | Timing Issues of Mini Circuits UFC-6000: Solved | The attached are the PSD plots with improved
FC timing(with the same code as in http://nodus.ligo.caltech.edu:8080/40m/10151).
More plots(Phase and PSD) to follow. |
|
|
10215
|
Wed Jul 16 07:51:52 2014 |
Akhil | Update | General | Weekly Update | Work
Done:
Solved all the timing |
|
|
10222
|
Wed Jul 16 22:17:40 2014 |
Akhil | Summary | Electronics | Bode Plots and complete Characterization of Frequency Counter | Goal:
To estimate the transfer function
and the noise in the FC that is a part of |
|
|
10239
|
Fri Jul 18 19:32:50 2014 |
Akhil | Summary | Electronics | Filters used inside the Frequency Counter |
Thanks Koji , for your hint
for the brain teasing puzzle. I was looking |
|
|
10246
|
Mon Jul 21 12:16:27 2014 |
Akhil | Summary | Electronics | Filters used inside the Frequency Counter | The expected bode plots for such
a filter with L= 4 is attached and compared |
|
|
10257
|
Tue Jul 22 23:10:12 2014 |
Akhil | Update | General | Weekly Update | Work
Done |
|
|
10261
|
Wed Jul 23 11:15:54 2014 |
Akhil | Update | Electronics | Installation of FCs in the 40m | As a part of installation of two(X-ARM
and Y-ARM) frequency counters in the 40m,
I have tested their performance when using |
|
|
10272
|
Thu Jul 24 19:28:43 2014 |
Akhil | Update | General | Thermal Actuator Transfer Functions | As a part of temperature actuator
characterization, today Eric Q and I made
some measurements for the open loop TF of |
|
|
10274
|
Sat Jul 26 10:12:19 2014 |
Akhil | Update | General | Data Acquisition from FC into EPICS Channels | I succeeded in creating a new channel
access server hosted on domenica ( R Pi)
for continuous data acquisition from the |
|
|
10275
|
Sat Jul 26 13:10:14 2014 |
Akhil | Update | General | Thermal Actuator Transfer Functions | Koji said that the method we used for X-arm
thermal actuator TF measurement was not correct
and suggested us to make measurements separately |
|
|
10277
|
Sat Jul 26 14:35:28 2014 |
Akhil | Update | General | Data Acquisition from FC into EPICS Channels |
|
|
|
10281
|
Mon Jul 28 16:34:02 2014 |
Akhil | Update | General | Calibration of measured Thermal Actuator TFs | To calibrate the measured TFs and
characterize the thermal actuator for the
FOL loop, we [ Me, Eric Q, Koji ] made the |
|
|
10283
|
Mon Jul 28 17:53:00 2014 |
Akhil | Update | General | Work plan for the Upcoming weeks- FOL Project | [Akhil, Harry]
Work
Completed |
|
|
10286
|
Tue Jul 29 18:00:20 2014 |
Akhil | Update | LSC | Calibration of ETMX and ETMY actuators | The ultimate goal of characterizing the
temperature actuator turned to be fruitful
in obtaining the calibration values for ETMX |
|
|
10297
|
Wed Jul 30 11:15:44 2014 |
Akhil | Update | General | Weekly Update | Plan for the week:
PID loop design and testing
with the Green laser beat note by actuating |
|
|
10298
|
Wed Jul 30 15:33:48 2014 |
Akhil | Summary | General | Calibrated Thermal Actuator TFs | The goal of the measurements we made
( my previous 3 elogs) was to characterize
the laser frequency thermal actuator that |
|
|
10304
|
Thu Jul 31 11:54:54 2014 |
Akhil | Summary | Electronics | PZT Calibration | Koji asked me to get the calibration
of the PZT counts to Volts for the the X
and Y ends. Yesterday, I went inside the |
|
|
10307
|
Thu Jul 31 14:23:28 2014 |
Akhil | Summary | Electronics | PZT Calibration |
The PZT seems to saturate at
around +/- 3500 counts. So for the Y arm, |
|
|
10324
|
Fri Aug 1 18:48:46 2014 |
Akhil | Summary | Electronics | PZT Calibration |
The PZT actuation on the laser
frequency in MHz/V ( assuming the previous |
|
|
10333
|
Tue Aug 5 19:05:41 2014 |
Akhil | Update | General | Beat Note Testing on EPICS Channels | |
|
|
10334
|
Tue Aug 5 19:20:05 2014 |
Akhil | Update | General | PID loop Design for beat note stabilization | Today I and EricQ went inside the
lab and set up the cables running from the
a DAC channel into PZT input so that |
|
|
10352
|
Fri Aug 8 14:27:18 2014 |
Akhil | Update | Computer Scripts / Programs | FOL Scripts | The scripts written for interfacing
the FC with R Pi, building EPICS database,
piping data into EPICS channels,PID loop |
|
|
10353
|
Fri Aug 8 14:42:41 2014 |
Akhil | Update | General | PID loop Design for beat note stabilization | The attached in a zip file are the
Simulink feedback loop models for the FOL
for both X and Y ends. The controller PID |
|
|
2794
|
Mon Apr 12 20:48:51 2010 |
Aidan, Mott | Summary | Green Locking | Temperature sweep of the Innolight: df/dT ~ 3.3GHz/K |
|
|
|
2797
|
Tue Apr 13 12:39:51 2010 |
Aidan, Mott | Summary | Green Locking | Temperature sweep of the Innolight: df/dT ~ 3.3GHz/K | Please put those numbers onto wiki somewhere
at the green page or laser characterization
page. |
|
|
4441
|
Thu Mar 24 19:48:13 2011 |
Aidan, Kiwamu | Update | Green Locking | Designs for permanent electronics for ALS | Kiwamu and I looked at all the electronics
that are currently in place for the green
locking on the X-arm and have made a set |
|
|
4471
|
Wed Mar 30 21:43:31 2011 |
Aidan, Kiwamu | Summary | Green Locking | Calculation of the green contrast on the RF PD | Skip to final thought ...
Kiwamu and I have set about measuring
the contrast of the signal on the RF PD. |
|
|
4472
|
Wed Mar 30 21:46:10 2011 |
Aidan, Kiwamu | Update | Green Locking | States of the Green beat note | The attached table shows the amplitude
of the green beat note when the end laser
was in various states. We can increase the |
|
|
3096
|
Tue Jun 22 09:45:21 2010 |
Aidan, Joe, Razib | Update | Phase Camera | Current phase camera setup. Seeing Acoustic beat | We've set up a preliminary test bed
for the phase camera. It simply uses a HeNe
that is split into two beams. One is frequency |
|
|
4213
|
Thu Jan 27 17:12:02 2011 |
Aidan, Joe | Summary | Green Locking | Digital Frequency to Amplitude converter | Joe and I built a very simple digital frequency
to amplitude converter using the RCG. The
input from an ADC channel goes through a |
|
|
4218
|
Fri Jan 28 10:27:46 2011 |
Aidan, Joe | Summary | Green Locking | Digital Frequency Discriminator - calibration | One more thing ... we can calibrate
the output of the LP filter to give a result
in Hz with the following calibration: |
|
|
4401
|
Thu Mar 10 16:00:53 2011 |
Aidan, Joe | Update | Green Locking | Intensity stabilization loop using beatnote DC. | Aidan: Joe and I have added a channel that
takes the DC output from the vertex beatnote
PD and sends it, via RFM, to a DAC at the |
|
|
2835
|
Fri Apr 23 18:30:49 2010 |
Aidan, Jenne, Koji | Summary | Green Locking | Green means GO! | Jenne, Koji and I assembled the Covesion
Oven today, inserted a PPKTP crystal from
Raicol, aligned the crystal to a 50mW focus |
|
|
4521
|
Wed Apr 13 23:32:07 2011 |
Aidan, Jamie | Configuration | LSC | AS PD and Camera installed | I spent some time tracking down the AS
beam which had vanished from the AP table.
Eventually, by dramatically mis-aligning |
|
|
4536
|
Fri Apr 15 22:57:38 2011 |
Aidan, Jamie | Configuration | LSC | AS PD and Camera installed | AS port ITMX YAW range where AS beam
was visible = [-1.505, -1.225] - these extrema
put the beam just outside of some aperture |
|
|
4534
|
Fri Apr 15 22:54:20 2011 |
Aidan, Bryan | Update | Green Locking | Beat note amplitude on Vertex PD | I was investigating the beat note amplitude
on the vertex PD again yesterday. The incident
power on the PD was 150uW in the PSL green |
|
|
742
|
Sat Jul 26 15:09:57 2008 |
Aidan | Update | Computers | Reboot of op440m |
I was reviewing the PSL Overview screen this
afternoon and op440m completely froze when |
|
|
1205
|
Mon Dec 29 18:01:07 2008 |
Aidan | Update | Auxiliary locking | Updated 40m Upgrade Document T080074-00-R |
Added a paragraph to the 40m Upgrade document
describing the fiber stabilization and frequency |
|
|
1687
|
Fri Jun 19 13:39:29 2009 |
Aidan | Update | General | Upper limit measurement of the scatter from the eLIGO beam dumps. |
|
|
|
1782
|
Thu Jul 23 07:34:45 2009 |
Aidan | Update | CDS | Added C2 MEDM screens to 40m SVN. |
See Adhikari eLOG entry: http://nodus.ligo.caltech.edu:8080/AdhikariLab/194 |
|