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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. | ||
These trapped particles must be able to complete their (banana) orbits, so a requirement for the existence of the bootstrap current is ν<sub>ei</sub> < ν<sub>b</sub> (the collision frequency is less than the banana | These trapped particles must be able to complete their (banana) orbits, so a requirement for the existence of the bootstrap current is ν<sub>ei</sub> < ν<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''. | ||
The bootstrap current is estimated (roughly) as | The bootstrap current is estimated (roughly) as | ||