Collisionality - Alchetron, The Free Social Encyclopedia

In plasma physics of tokamaks, collisionality is a dimensionless parameter which expresses the ratio of the electron-ion collision frequency to the banana orbit frequency.

Definition

The plasma collisionality ν ∗ is defined as

ν ∗ = ν e i m e k B T e ϵ − 3 / 2 q R ,

where ν e i denotes the electron-ion collision frequency, R is the plasma major radius, ϵ is the inverse aspect-ratio, and q is the safety factor. The plasma parameters m i and T i denote, respectively, the mass and temperature of the ions, and k B is the Boltzmann constant.

References

Collisionality Wikipedia

(Text) CC BY-SA