# Nuclear Fusion Physics and Technology/Tokamak Device Overview

#### Note: Basic assumptions

Lets assume electromagnetic field described by electric and magnetic vector fields ${\vec {E}}({\vec {r}}),{\vec {B}}({\vec {r}})$  and plasma described by probability density $f({\vec {r}})$ . Also lets assume that basic terms are self-explaining.

#### Definition: Magnetic vessel

Magnetic vessel is electromagnetic field device aimed for plasma keeping.

#### Definition: Linear configuration

Linear configuration of magnetic vessel is electromagnetic field with parallel field lines and open ends.

#### Definition: Toroidal configuration

Toroidal configuration of magnetic vessel is toroidal electromagnetic field with closed ends.

#### Definition: Number 8 configuration

Number 8 configuration of magnetic vessel is crossed electromagnetic field with closed ends and field lines in number 8 shape.

#### Definition: Stelarator

Stelarator is axial asymmetric magnetic vessel with toroidal configuration.

#### Definition: Poloidal magnetic field

Poloidal magnetic field of toroidal magnetic vessel is magnetic field component with field lines closed perpendicular around coordinate $\varphi$ .

#### Definition: Toroidal magnetic field

Toroidal magnetic field of toroidal magnetic vessel is magnetic field component with field lines closed perpendicular around coordinate $h$ .

#### Definition: Magnetic axis

Major radius $R_{0}$  is distance between main axis to magnetic axis.
Minor radius $r_{0}$  is distance between magnetic axis and plasma edge. (plasma edge definition needed, maybe 1/e drop of f(r)?)
Aspect ratio $a$  is ratio of major radius and minor radius
$a={\frac {R_{0}}{r_{0}}}$