Bootstrap current: Difference between revisions

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The bootstrap current is a [[Neoclassical transport|Neoclassical]] toroidal current produced in the presence of a pressure gradient, associated with the existence of trapped (banana) particles.
The bootstrap current is a [[Neoclassical transport|Neoclassical]] toroidal current produced in the presence of a pressure gradient, associated with the existence of trapped (banana) particles in toroidal magnetic confinement systems.
These trapped particles must be able to complete their (banana) orbits, so a requirement for the existence of the bootstrap current is &nu;<sub>ei</sub> &lt; &nu;<sub>b</sub> (the collision frequency is less than the banana bounce frequency).
These trapped particles must be able to complete their (banana) orbits, so a requirement for the existence of the bootstrap current is &nu;<sub>ei</sub> &lt; &nu;<sub>b</sub> (the collision frequency is less than the banana bounce frequency).
The difference in particle density on banana orbits crossing a given radial position ''r'' then leads to a net toroidal current at ''r''.
The difference in particle density on banana orbits crossing a given radial position ''r'' then leads to a net toroidal current at ''r''.