Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

Plasma parameter

Plasma parameter


The plasma parameter is a dimensionless number, denoted by capital Lambda, Λ. The plasma parameter is usually interpreted to be the argument of the Coulomb logarithm, which is the ratio of the maximum impact parameter to the classical distance of closest approach in Coulomb scattering. In this case, the plasma parameter is given by:[1]

 Lambda = 4pi n lambda_D^3

where

n is the number density of electrons,
λD is the Debye length.

This expression is typically valid for a plasma in which ion thermal velocities are much less than electron thermal velocities. A detailed discussion of the Coulomb logarithm is available in the NRL Plasma Formulary, pages 34–35.

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