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   Convert keV to J.
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   Form:
   j = KEVToJ( keV )
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   ------
   Inputs
   ------
   keV            (1,:)  Energy (keV)
          

   -------
   Outputs
   -------
   j              (1,:)  Power (J)
   

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   Reference: Szirmay, L. V., "Nuclear Fusion Reactor Design Fundamentals,
              p. 184.
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