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Welcome to the Virtual Visitor Center at SLAC

Virtual Visitor Center at SLAC

EGS: Basic Simulation Tool

This web interface displays electron-gamma showers as a teaching tool for radiation transport phenomena.

You are welcome to try generating showers using this form. You can start by simply clicking the "generate shower" button at the bottom of the page.  If you experience difficulties with this form, please notify Ray Cowan (rfc@slac.stanford.edu).

Parameters Value Unit Range Default Value 
Define the Initial Particle
Type     electron
Incident kinetic energy MeV .010 to 1000 100
Number of particles in beam   1 to 100 10
Incident particle vertical spread Off
Random in Y axis
Uniform in Y axis		     Off
If on, define y-axis spread   ± cm 0 to 100 5
Define the Target
Target medium     concrete
Target length cm 0 to 100 20
Target radius cm 0 to 100 10
Define the Magnetic Field Strength and Direction(s)

Horizontal, parallel to the beam

 Tesla -10 to 10 0

Horizontal, perpendicular to the beam

 Tesla -10 to 10 0

Vertical, perpendicular to the beam

 Tesla -10 to 10 0
Define the Image Display Characteristics
Calculate all electrons and positrons
of an energy greater than		 MeV 0.010 to 1000 0.010
Calculate all photons of energy greater than MeV 0.001 to 1000 0.001
Display which types of particles? Electrons (green)
Photons (yellow)
Positrons (red)		     Display all
View shower from? Side
End
Top		    

Side view

Advanced Simulation Tool