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None Spread of starting particle angles for microelectronics example 

Forum: Documentation and Examples
Date: 15 Apr, 2016
From: Christopher Walker <Christopher Walker>

Hello,
  OS: Microsoft Windows 7;
  CMake version: 3.5.1 ;
  Geant4 version: 10.02.p01 ;
  Compiler: MS Visual Studio 14 (2015) ;

I am running the microelectronics example. I have extended the number of particles in the example to 200 and using just electrons of 30keV. Looking at the visualisation output I was expecting to a see a thin solid horizontal line representing the primary input electrons which are then scattered in the Si block. However, I see that there seems to be a cone of electrons with a range of angles of about 15 degrees being emitted from the particle gun. The PrimaryGeneratorAction class seems to specify a simple particle gun and the microelectronics.mac file does not specify anything unusual for the gun. Can someone explain to me why I should see a spray of electrons apparently being emitted from the gun rather than electrons being emitted in a straight line ?

I have attached a view (in orthogonal view) of the output screen.

Thanks Chris

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/04/15/11.07-57027-microelectronics.JPG

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