Theory of two threshold fields for relativistic runaway electrons

Theory of two threshold fields for relativistic runaway electrons

This Letter presents a rigorous kinetic theory for relativistic runaway electrons in the near critical electric field in tokamaks. The theory provides a distribution function of the runaway electrons, reveals the presence of two different threshold electric fields, and describes a mechanism for hyst...

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Veröffentlicht in:Physical review letters 2015-04, Vol.114 (15), p.155001-155001, Article 155001
Hauptverfasser: Aleynikov, Pavel, Breizman, Boris N
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Sprache:eng
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Distribution functions
Electric fields
Electron avalanche
Hysteresis
Kinetic theory
Thresholds
Time
Tokamaks
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creator Aleynikov, Pavel
Breizman, Boris N
description This Letter presents a rigorous kinetic theory for relativistic runaway electrons in the near critical electric field in tokamaks. The theory provides a distribution function of the runaway electrons, reveals the presence of two different threshold electric fields, and describes a mechanism for hysteresis in the runaway electron avalanche. Two different threshold electric fields characterize a minimal field required for sustainment of the existing runaway population and a higher field required for the avalanche onset. The near-threshold regime for runaway electrons determines the time scale of toroidal current decay during runaway mitigation in tokamaks.
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subjects Distribution functions
Electric fields
Electron avalanche
Hysteresis
Kinetic theory
Thresholds
Time
Tokamaks
title Theory of two threshold fields for relativistic runaway electrons
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