TokamakBeta:

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   Computes the tokamak beta.
   The input is the minor radius/major radius. The minor radius is the
   radius of the cylinder that makes up the toroid. The major radius is 
   from the center of the toroid to the centerline of the cylinder that
   makes up the torus.

   Type TokamakBeta for a demo.
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   Form:
   beta = TokamakBeta( aR )
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   ------
   Inputs
   ------
   aR        (1,:)   Aspect ratio, minor radius/major radius

   -------
   Outputs
   -------
   beta      (1,:)   Toroidal beta  

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   References:	Szirmay, L. V., "Nuclear Fusion Reactor Design 
               Fundamentals",Colas Publishing, 1992, p. 146.
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Children:

Common: Graphics/Plot2D