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Hot tail runaway electron generation in tokamak disruptions
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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 ISSN 1070-664X.
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Official URL: http://dx.doi.org/10.1063/1.2949692
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 | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > 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: |
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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 |
Data sourced from Thomson Reuters' Web of Knowledge
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