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Title: On the avalanche generation of runaway electrons during tokamak disruptions

A simple zero dimensional model for a tokamak disruption is developed to evaluate the avalanche multiplication of a runaway primary seed during the current quench phase of a fast disruptive event. Analytical expressions for the plateau runaway current, the energy of the runaway beam, and the runaway energy distribution function are obtained allowing the identification of the parameters dominating the formation of the runaway current during disruptions. The effect of the electromagnetic coupling to the vessel and the penetration of the external magnetic energy during the disruption current quench as well as of the collisional dissipation of the runaway current at high densities are investigated. Current profile shape effects during the formation of the runaway beam are also addressed by means of an upgraded one-dimensional model.
Authors:
 [1] ; ;  [2]
  1. Universidad Carlos III de Madrid, Avenida de la Universidad 30, 28911 Madrid (Spain)
  2. ITER Organization, Route de Vinon sur Verdon, CS 90 046, 13067 St Paul Lez Durance Cedex (France)
Publication Date:
OSTI Identifier:
22490055
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANALYTIC FUNCTIONS; COUPLING; CURRENTS; ELECTRON BEAMS; ENERGY SPECTRA; ONE-DIMENSIONAL CALCULATIONS; RUNAWAY ELECTRONS; TOKAMAK DEVICES; TOWNSEND DISCHARGE