# Nuclear Fusion Physics and Technology/Tokamak Device Overview

#### Note: Basic assumptionsEdit

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 vesselEdit

Magnetic vessel is electromagnetic field device aimed for plasma keeping.

#### Definition: Linear configurationEdit

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

#### Definition: Toroidal configurationEdit

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

#### Definition: Number 8 configurationEdit

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

#### Definition: StelaratorEdit

Stelarator is axial asymmetric magnetic vessel with toroidal configuration.

#### Definition: Poloidal magnetic fieldEdit

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

#### Definition: Toroidal magnetic fieldEdit

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

#### Definition: Magnetic axisEdit

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
$a = \frac{R_0}{r_0}$