| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
10192
|
Mon Jul 14 12:49:07 2014 |
Nichin | Update | Electronics | New Prologix GPIB-Ethernet controller |
|
|
|
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 |
|
|
10194
|
Mon Jul 14 14:28:27 2014 |
Koji | Summary | Electronics | Timing Issues of Mini Circuits UFC-6000: Solved | Looks good. Now you have the internal timer
to verify the external clock.
If you can realize the constant rate |
|
|
10196
|
Mon Jul 14 16:51:07 2014 |
Nichin | Update | Electronics | Martian table updated, Named server restarted | [Nichin, Jenne]
The martian lookup tables are located
at |
|
|
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. |
|
|
10202
|
Tue Jul 15 12:36:17 2014 |
Nichin | Update | Electronics | RF cables rerouted |
|
|
|
10212
|
Wed Jul 16 01:46:41 2014 |
Nichin | Update | Electronics | Test run of PDFR system | A test run was conducted on the PDFR system
last afternoon and transimpedance plots were
generated for 6 of the PDs. The laser |
|
|
10214
|
Wed Jul 16 02:22:10 2014 |
Koji | Update | Electronics | Test run of PDFR system | Log-log ... |
|
|
10221
|
Wed Jul 16 21:24:41 2014 |
Reetika | Update | Electronics | VCO Driver inside 40m |
I
found the VCO driver, that Rana asked me |
|
|
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 |
|
|
10223
|
Wed Jul 16 23:02:16 2014 |
Koji | Summary | Electronics | Bode Plots and complete Characterization of Frequency Counter | If I assume 1sample delay for 0.1s sampling
rate, the delay is Exp[-I 2 pi f T], where
T is the sampling period. |
|
|
10227
|
Thu Jul 17 16:07:34 2014 |
Emily | Update | Electronics | VCO Driver | I took back he VCO driver that Reetika
brought over to the 40m from the PSL lab.
|
|
|
10229
|
Thu Jul 17 16:39:34 2014 |
Nichin | Update | Electronics | PDFR debugging attempt : REFL11 | In a attempt to debug the values of transimpedance
generated by the PDFR system, I did a manual
measurement for REFL11 PD. |
|
|
10232
|
Thu Jul 17 17:39:57 2014 |
Koji | Update | Electronics | PDFR debugging attempt : REFL11 | What is the coupling factor between the
RF in and the RF mon of the demodulator?
|
|
|
10238
|
Fri Jul 18 17:10:57 2014 |
Nichin | Summary | Electronics | Characterization of demodulator boards. | Rack 1Y2, I took transfer function measurements
for each of the following demodulator boards:
REFL11, REFL33, REFL55, REFL165, AS55, POP22, |
|
|
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 |
|
|
10243
|
Sun Jul 20 09:26:27 2014 |
Evan | Update | Electronics | MC servo card modifications in DCC |
|
|
|
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 |
|
|
10250
|
Tue Jul 22 08:24:42 2014 |
Evan | Update | Electronics | MC servo card: modified schematic |
|
|
|
10252
|
Tue Jul 22 15:50:35 2014 |
Nichin | Summary | Electronics | Characterization of demodulator boards. |
|
|
|
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 |
|
|
10263
|
Wed Jul 23 11:54:27 2014 |
Nichin | Update | Electronics | Characterization of demodulator boards. |
|
|
|
10265
|
Wed Jul 23 18:53:11 2014 |
Nichin | Update | Electronics | Time delay in RG405 coaxial cables | A time delay can be modeled
as the exponential transfer function : e(-sTd) |
|
|
10266
|
Wed Jul 23 19:30:34 2014 |
Nichin | Update | Electronics | Time delay in the RF multiplexer (Rack 1Y1) | A time
delay can be modeled as the exponential
transfer function : |
|
|
10280
|
Mon Jul 28 10:42:43 2014 |
Nichin | Update | Electronics | Demodulator board's characterization | I used vector fitting to fit the
transfer functions between RF input and PD
RF MON of demodulator boards. These fittings |
|
|
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 |
|
|
10306
|
Thu Jul 31 12:23:38 2014 |
Koji | Summary | Electronics | PZT Calibration | 1) Don't be brainless. Redo the fitting
of the Y arm. Obviously the fit is not good.
2) How can you explain the value |
|
|
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 |
|
|
10490
|
Wed Sep 10 20:24:00 2014 |
Jenne | Update | Electronics | POY RF cable loose | Sitting down to work on the IFO, I couldn't
lock the Yarm. I looked at the error
signal as well as the transmission on Dataviewer, |
|
|
10774
|
Wed Dec 10 15:05:32 2014 |
Jenne | Update | Electronics | Xend QPD whitening board modified already | In April, Koji logged that he had made
some changes to the Yend QPD whitening board
(elog |
|
|
10782
|
Thu Dec 11 16:42:12 2014 |
Jenne | Update | Electronics | Xend QPD whitening board plan | Here is a little PDF of what I plan to
do to both of the transmission QPD whitening
boards later today. The idea is to |
|
|
10794
|
Fri Dec 12 19:54:21 2014 |
Jenne | Update | Electronics | Xend QPD whitening board modified | Okay, I have finished modifying the Xend
QPD whitening board, although I will likely
need to change the gain on Monday. |
|
|
10795
|
Sat Dec 13 00:35:11 2014 |
rana | Update | Electronics | Xend QPD whitening board modified |
16 bit. There aren't any 14-bit
ADCs anywhere in LIGO. The aLIGO suspensions |
|
|
10799
|
Mon Dec 15 22:30:50 2014 |
Jenne | Update | Electronics | Yend QPD modified | Details later - empty entry for a reply.
Short story - Yend is now same as
Xend filters-wise and lack of gain sliders |
|
|
10801
|
Mon Dec 15 22:45:59 2014 |
Jenne | Update | Electronics | Yend QPD modified |
[Jenne, Rana, Diego]
We did some test on the modified |
|
|
10879
|
Thu Jan 8 19:02:42 2015 |
Jax | Summary | Electronics | MC demod modifications | Here's a summary of the changes made
to the D990511 serial 115 (formerly
known as REFL 33), as well as a short procedure. |
|
|
10954
|
Thu Jan 29 09:50:47 2015 |
manasa | Update | Electronics | IOO rack amplifier panel | The RF amplifier panel on the IOO rack
(Attachment 1) will be used to also hold
the RF amplfiers for the frequency counters. |
|
|
11022
|
Fri Feb 13 14:27:30 2015 |
ericq | Update | Electronics | Second QPD Whitening Switch enabled | I have re-enabled the second whitening
stage switching on each quadrant of each
end's QPD whitening board, to try and |
|
|
11023
|
Fri Feb 13 14:59:13 2015 |
ericq | Update | Electronics | Second QPD Whitening Switch enabled | Went to zero CARM offset on ALS; transmission
QPDs are still saturating :(
Maybe we need to switch off all |
|
|
11024
|
Fri Feb 13 17:07:51 2015 |
Jenne | Update | Electronics | Second QPD Whitening Switch enabled | I first updated the DCC branches for the
Xend and Yend to reflect the as-built situation
from December 2014, and then I updated the |
|
|
11025
|
Fri Feb 13 18:56:44 2015 |
rana | Update | Electronics | Second QPD Whitening Switch enabled | Depends on the plots of the whitening I
guess; if its low freq sat, then we lower
the light level with ND filters. If its happening |
|
|
11049
|
Thu Feb 19 04:09:21 2015 |
ericq | Update | Electronics | Second QPD Whitening Switch enabled | X end QPD has recieved 0.2+0.4 absorptive
ND filters. Y end QPD got one at 0.6. This
appears to have mitigated the saturations |
|
|
11225
|
Sun Apr 19 15:03:26 2015 |
Jenne | Update | Electronics | Low noise pre-amps? | Does anyone know where the Busby
or Rai low noise pre-amp boxes are?
|
|
|
11226
|
Mon Apr 20 16:18:29 2015 |
Jenne | Update | Electronics | Low noise pre-amps: returned | The Rai box was in the Cryo lab, and the
Busby box was in the TCS lab. Neither
had been signed out. Lame. Anyhow, |
|
|
11228
|
Mon Apr 20 21:26:46 2015 |
rana | Update | Electronics | Low noise pre-amps: returned | +1 to both Evan and Zach for prompt info
and +2 to you for getting more stuff than
you started looking for. -2 karma to |
|
|
11237
|
Wed Apr 22 17:04:11 2015 |
rana | Update | Electronics | MC REFL PD back from the dead | Just randomly found this old entry from
3 years ago. We should |
|
|
11238
|
Thu Apr 23 08:43:40 2015 |
Steve | Update | Electronics | EG&G InGaAs diodes in stock | RFpds box is moved from RF cabinet E4 to
clean cabinet S15
Inventory updated at https://wiki-40m.ligo.caltech.edu/RF_Pd_Inventory |
|
|
11403
|
Mon Jul 13 14:08:10 2015 |
ericq | Update | Electronics | New RF amps, housed | I made a little box for the new RF amplifiers
we'll be using for the green beatnotes,
to keep things tidy on the PSL table. They |
|
|
11445
|
Fri Jul 24 20:32:15 2015 |
ericq | Update | Electronics | LSC LO distribution box power button replaced | As happened with the RF distribution box
in the IOO rack a while back, the shiny blue
power button in the LSC LO distribution box |
|