| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
2780
|
Wed Apr 7 10:58:15 2010 |
Koji | Update | Electronics | REFL11 Noise Simulation | What??? I don't see any gray trace
of Rs in the plot. What are you talking about?
Anyway, if you are true, the circuit |
|
|
2781
|
Wed Apr 7 11:11:19 2010 |
Alberto | Update | Electronics | REFL11 Noise Simulation |
|
|
|
2782
|
Thu Apr 8 10:17:52 2010 |
Alberto | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent | From the measurements of the 11 MHz RFPD
at 11Mhz I estimated a transimpedance of
about 750 Ohms. (See attached plot.) |
|
|
2783
|
Thu Apr 8 10:24:33 2010 |
Alberto | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent |
|
|
|
2784
|
Thu Apr 8 20:53:13 2010 |
Koji | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent | Something must be wrong.
1. Physical Unit is wrong for the
second term of "Vn = Vdn + Sqrt(2 e |
|
|
2785
|
Fri Apr 9 06:45:28 2010 |
Alberto | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent |
|
|
|
2790
|
Mon Apr 12 17:09:30 2010 |
Alberto | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent |
|
|
|
2795
|
Mon Apr 12 22:44:30 2010 |
Koji | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent | Data looks perfect ... but the fitting
was wrong.
Vn = Vdn + Z * sqrt( 2 e Idc ) |
|
|
3890
|
Thu Nov 11 02:17:27 2010 |
Kevin | Update | Electronics | REFL11 Photodiode Not Working | [Koji and Kevin]
I was trying to characterize the
REFL11 photodiode by shining a flashlight |
|
|
3893
|
Thu Nov 11 07:26:03 2010 |
Alberto | Update | Electronics | REFL11 Photodiode Not Working |
|
|
|
4275
|
Sat Feb 12 08:08:05 2011 |
Suresh | Update | Electronics | REFL11 Photodiode replaced | A new photodiode ( Perkin and Elmer Model
no. C30642GH Sl No.1526) has been installed
in the place of the old photodiode. |
|
|
4276
|
Sat Feb 12 23:22:21 2011 |
rana | Update | Electronics | REFL11 Photodiode replaced | 375 mW is way too much light. We must never
put more than 100 mW on any of these diodes.
We don't want to blow up more diodes like |
|
|
4277
|
Sun Feb 13 02:33:37 2011 |
Koji | Update | Electronics | REFL11 Photodiode replaced | Suresh is saying 375mW and 0.375mW. Let's
wait for his update of the actual power.
Also he is not using EPICS, there |
|
|
4279
|
Sun Feb 13 16:20:53 2011 |
Suresh | Update | Electronics | REFL11 Photodiode replaced | It is 0.375 mW as in the calculation.
The total diode output is just 1mW and it
is divided with a 50/50 beam splitter... |
|
|
2761
|
Sat Apr 3 19:54:19 2010 |
Alberto | Update | 40m Upgrading | REFL11 and REFL55 PDs Noise Spectrum | These are the dark noise spectrum that
I measured on the 11MHz and 55MHz PD prototypes
I modified. |
|
|
9564
|
Wed Jan 22 09:05:42 2014 |
Gabriele | Configuration | LSC | REFL11 back | Yesterday night I plugged back the
REFL11 RF cable into the corresponding demodulation
board. |
|
|
15923
|
Tue Mar 16 16:02:33 2021 |
Koji | Update | LSC | REFL11 demod retrofitting | I'm going to remove REFL11 demod for
the noise check/circuit improvement.
---- |
|
|
15936
|
Thu Mar 18 07:02:27 2021 |
Koji | Update | LSC | REFL11 demod retrofitting | Attachment 1: Transfer Functions
The original circuit had a gain
of ~20 and the phase delay of ~1deg at 10kHz, |
|
|
4756
|
Fri May 20 11:37:44 2011 |
Koji | Update | Electronics | REFL11 fixed (REFL11 not working) | - Found the inductor which shunts the positive
input of MAX4107 was not touching the ground.
|
|
|
4747
|
Thu May 19 03:13:54 2011 |
kiwamu | Update | Electronics | REFL11 not working |
|
|
|
4782
|
Thu Jun 2 23:10:10 2011 |
Koji | Update | Electronics | REFL11 test results (Re: REFL11 fixed) | The full characterization of REFL11 is
found in the PDF.
Resonance at 11.062MHz |
|
|
2704
|
Tue Mar 23 22:46:43 2010 |
Alberto | Update | 40m Upgrading | REFL11 upgraded | I modified REFL11 according to the changes
lsited in this
schematic (see wiki / Upgrade 09 |
|
|
2711
|
Wed Mar 24 14:57:21 2010 |
Alberto | Update | 40m Upgrading | REFL11 upgraded |
Hartmut suggested a possible
explanation for the way the electronics transfer |
|
|
4272
|
Fri Feb 11 00:20:58 2011 |
Suresh | Update | Electronics | REFL11: Photodiode requires replacement |
This is with reference to Kevin and
Jenne's elogs # 3890, |
|
|
5101
|
Wed Aug 3 02:20:33 2011 |
Koji | Update | LSC | REFL165 PD | REFL165 PD has been made from the old 166MHz
PD.
As the required inductance was ~10nF |
|
|
5112
|
Wed Aug 3 22:22:47 2011 |
Koji | Update | LSC | REFL165 PD | This REFL165 was good in terms of RF, but
I forgot to make the DC path functioning.
I will try some ideas to fix this |
|
|
5121
|
Fri Aug 5 04:03:16 2011 |
Koji | Update | LSC | REFL165 PD | REFL165 PD was made and tested. The characterization
results are in the PDF file.
Resonance at 166.12MHz |
|
|
6423
|
Fri Mar 16 06:17:56 2012 |
Suresh | Update | Electronics | REFL165 calibration : measurements |
These are the measurements for estimating
the amplitude of the signal recorded in the |
|
|
6425
|
Fri Mar 16 16:01:53 2012 |
rana | Update | Electronics | REFL165 calibration : measurements | To characterize the RF V to counts
we need to know the state of the whitening
filter board. Was the filter on or off ? |
|
|
6428
|
Mon Mar 19 21:25:31 2012 |
Suresh | Update | Electronics | REFL165 calibration : measurements |
|
|
|
5678
|
Mon Oct 17 11:40:44 2011 |
Koji | Update | LSC | REFL165 removed from the table | REFL165 removed from the table for the
C(V) test |
|
|
5681
|
Mon Oct 17 22:20:42 2011 |
Koji | Update | LSC | REFL165 removed from the table |
|
|
|
5685
|
Tue Oct 18 10:04:41 2011 |
Koji | Update | LSC | REFL165 removed from the table | The original REFL165 had ~50MHz/A dependence
on the DC photocurrent.
The resistr R21, which was 2670 Ohm |
|
|
6333
|
Tue Feb 28 16:31:08 2012 |
Suresh | Update | Electronics | REFL165 repair: Characterization | The transfer function and current noise
were measured. The location of the
peak shifts with the amount of incident light |
|
|
6339
|
Wed Feb 29 01:14:40 2012 |
Suresh | Update | Electronics | REFL165 repair: Characterization |
|
|
|
6337
|
Wed Feb 29 00:22:35 2012 |
Suresh | Update | Electronics | REFL165 repair: Installed on the AS table | 1) The REFL165 has been replaced onto the
AS table.
2) When the PD interface cable is |
|
|
6290
|
Thu Feb 16 21:13:07 2012 |
Suresh | Update | Electronics | REFL165 repair: PD replaced, DC response checked with a torch light | [Koji, Suresh]
Kiwamu mentioned that REFL165 is
not responding and its DC out seems saturated |
|
|
6418
|
Wed Mar 14 16:39:02 2012 |
Suresh | Update | General | REFL165 signal was not reaching demod board : Fixed |
|
|
|
5086
|
Mon Aug 1 23:26:32 2011 |
Koji | Update | LSC | REFL33 PD | Old MZ PD (InGaAs 2mm, @29.5MHz) has been
modified for REFL33.
There has been no choice for the 11MHz |
|
|
5113
|
Wed Aug 3 22:31:38 2011 |
Koji | Update | LSC | REFL33 PD | REFL33 is ready for the installation
Characterization results of REFL33
is found in the PDF attachment. |
|
|
6411
|
Wed Mar 14 04:19:51 2012 |
kiwamu | Update | LSC | REFL33Q for MICH control : not good | I tried the REFL33Q for controlling
MICH in the PRMI configuration (#6407)
|
|
|
3952
|
Fri Nov 19 03:43:33 2010 |
Kevin | Update | Electronics | REFL55 Characterizations | [Koji, Rana, and Kevin]
I have been trying to measure the
shot noise of REFL55 by shining a light bulb |
|
|
3955
|
Fri Nov 19 15:51:50 2010 |
Koji | Update | Electronics | REFL55 Characterizations | RF Transimpedance of 200Ohm means the residual
impedance at the resonance (R_res) of 40,
|
|
|
4605
|
Tue May 3 04:09:53 2011 |
Koji | Update | LSC | REFL55 PD update | [Rana, Koji]
REFL55 was modified. The noise level
confirmed. The PD is now ready to be installed. |
|
|
4845
|
Mon Jun 20 18:36:49 2011 |
Suresh | Update | LSC | REFL55 PD update | [Suresh, Koji]
I used a matlab code
written by Koji to analyse the transimpedance |
|
|
3944
|
Thu Nov 18 01:52:58 2010 |
Kevin | Update | Electronics | REFL55 Transfer Functions | I measured the optical and electrical transfer
functions for REFL55 and calculated the RF
transimpedance. To measure the optical transfer |
|
|
2715
|
Thu Mar 25 17:32:42 2010 |
Alberto | Update | 40m Upgrading | REFL55 Upgraded | I upgraded the old REFL199 to the new REFL55.
To do that I had to replace the old
photodiode inside, switching to a 2mm one. |
|
|
15990
|
Fri Apr 2 01:26:41 2021 |
gautam | Update | Electronics | REFL55 chain checkout again, seems fine | [koji,
gautam]
Summary: |
|
|
13276
|
Wed Aug 30 19:49:33 2017 |
gautam | Update | LSC | REFL55 demod board debugging | Summary:
Today
I tried debugging the mysterious increase
in REFL55 signal levels in the DRMI configuration. |
|
|
15871
|
Fri Mar 5 16:24:24 2021 |
gautam | Update | LSC | REFL55 demod board re-installed in 1Y2 | I don't have a good explanation why,
but I too measured similar numbers to what
Koji measured. The overall conversion gain |
|