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Keywords: models, range of validity
Forum: Documentation and Examples
Re: Question Standard electromagnetic model (giorgio)
Date: 14 Oct, 2003
From: michel maire <michel maire>

User giorgio wrote:

>> hi, I read that the low energy models extend the coverage of
>> electromagnetic interactions of photons and electrons down to 250 eV,
>> and of protons, ions and antiprotons down to <1 keV. What is the range
>> of validity of standard electromagnetic model?
>> 
>> Thanks in advance
>> 
>> Giorgio

 There is no 'magic' number for the limit of validity of the 2 packages.
 Take 1 keV as an indication. In both case the produced particles are
 tracked down to zero kinetic energy. But the treatement of low energy
 particles is different : Low Energy model tries to take into account
 the shell structure of the atomic electrons, while 'standard' neglects it.

 If your simulation is sensitive to such details, use LowEnergy extension.
 Otherwise, standard is simpler and more efficient.

           Michel  

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