Notes of LAPPD Photocathode Development

Tube #46

Monday 10 August 2015 - Filed under Uncategorized

Tube #46

 ::  Share or discuss  ::  2015-08-10  ::  jxie

QE map tube #44 & #45

Monday 29 June 2015 - Filed under Uncategorized

Tube #44

Tube #45

 ::  Share or discuss  ::  2015-06-29  ::  jxie

QE for 6cm x 6cm

Thursday 31 July 2014 - Filed under Uncategorized

6cm x 6cm photodetector QE Measurement

 ::  Share or discuss  ::  2014-07-31  ::  jxie

Sb and Photocathode in sSTF

Thursday 6 March 2014 - Filed under Uncategorized


 ::  Share or discuss  ::  2014-03-06  ::  jxie

Photocathode for UV photodetectors

Friday 20 December 2013 - Filed under Uncategorized

Photocathode for UV photodetectors

 ::  Share or discuss  ::  2013-12-20  ::  jxie

Introduction of X-ray Reflectivity

Tuesday 12 March 2013 - Filed under Uncategorized

Introduction of X-ray Reflectivity1

 ::  Share or discuss  ::  2013-03-12  ::  jxie

Logging Burle Temp and Pressure Data with averaging

Saturday 2 March 2013 - Filed under Uncategorized

The Burle environment logging code has been upgraded
to take many reading per time point to get average values
This required especially for the temperature, where the
voltages are quit small and there is noise. It appears at
least 400 points are required to give a uncertainty  of a few degrees.

The above figures show the data collected Feb 28 -Mar 1 2013


 ::  Share or discuss  ::  2013-03-02  ::  edmay

Plots of Pressure and Temperature logging data

Monday 18 February 2013 - Filed under Uncategorized

These data were taken during a Burle deposition run on Fe 13 2010 to test the logging
code and the calibration of 6009 digitized voltage to pressure and temperature.

Calibrated Pressure data using single reads at 1 second intervals.
Pressure log data The dramatic wiggle at about 14:10:00 is not
the result of the calibration which in fact has a break at the voltage corresponding to
0.01mT as I am using a 2 region piecewise continuous function. The wiggle is also in the
raw signal. Jun does not remember any operation which could be identified with this issue.

Calibrated Temperature data using single reads at 1 second interval.
Temperature log data Clearly the readout voltage of a few millvolts
is to small for the noise environment for single reads.

Calibrated Temperature data using an average of 10 1second points for plot interval of 1 min.
Error bars are std/sqrt(10).
Temperature log data The averaging improves the situation. I will
adjust the code to do averaging of a few hundred reads to see of the means provide a more
reliable measurement.

 ::  Share or discuss  ::  2013-02-18  ::  edmay

DAQ for Burle Pressure/Temp/Photodiode

Tuesday 12 February 2013 - Filed under Uncategorized

A code has been developed to readout a NI 6009 digitizer and log data to disk. A plot (in chart recorder mode) of some test data is shown below. The Burle equipment is off, so values are meaningless!
Ed May

Chart recorder mode

 ::  Share or discuss  ::  2013-02-12  ::  edmay

transmission reflection map

Tuesday 5 June 2012 - Filed under Uncategorized

transmission-reflection map 0

 ::  Share or discuss  ::  2012-06-05  ::  jxie