Smith, H. M. (Hakan M.) and Verwichte, E. (Erwin) (2008) Hot tail runaway electron generation in tokamak disruptions. Physics of Plasmas, Vol.15 (No.7). article no. 072502 . doi:10.1063/1.2949692

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Abstract

Hot tail runaway electron generation is caused by incomplete thermalization of the electron velocity distribution during rapid plasma cooling. It is an important runaway electron mechanism in tokamak disruptions if the thermal quench phase is sufficiently fast. Analytical estimates of the density of produced runaway electrons are derived for cases of exponential-like temperature decay with a cooling rate lower than the collision frequency. Numerical simulations, aided by the analytical results, are used to compare the strength of the hot tail runaway generation with the Dreicer mechanism for different disruption parameters (cooling rate, post-thermal quench temperature, and electron density) assuming that no losses of runaway electrons occur. It is seen that the hot tail runaway production is going to be the dominant of these two primary runaway mechanisms in ITER [R. Aymar , Plasma Phys. Controlled Fusion 44, 519 (2002)]. (c) 2008 American Institute of Physics.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Tokamaks, Plasma (Ionized gases)
Journal or Publication Title:	Physics of Plasmas
Publisher:	American Institute of Physics
ISSN:	1070-664X
Official Date:	July 2008
Dates:	Date Event July 2008 Published
Volume:	Vol.15
Number:	No.7
Number of Pages:	9
Page Range:	article no. 072502
DOI:	10.1063/1.2949692
Status:	Peer Reviewed
Publication Status:	Published

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