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research article

Effective critical electric field for runaway electron generation

Stahl, A
•
Hirvijoki, E
•
Decker, J
Show more
2015
Physical Review Letters

In this Letter we investigate factors that influence the effective critical electric field for runaway-electron generation in plasmas. We present numerical solutions of the kinetic equation and discuss the implications for the threshold electric field. We show that the effective electric field necessary for significant runaway-electron formation often is higher than previously calculated due to both (1) extremely strong dependence of primary generation on temperature and (2) synchrotron radiation losses. We also address the effective critical field in the context of a transition from runaway growth to decay. We find agreement with recent experiments, but show that the observation of an elevated effective critical field can mainly be attributed to changes in the momentum-space distribution of runaways, and only to a lesser extent to a de facto change in the critical field.

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Type
research article
DOI
10.1103/PhysRevLett.114.115002
Web of Science ID

WOS:000351507400010

Author(s)
Stahl, A
Hirvijoki, E
Decker, J
Embréus, O
Fülöp, T
Date Issued

2015

Published in
Physical Review Letters
Volume

114

Article Number

115002

Subjects

runaway electrons

•

critical field

•

synchrotron emission

URL

URL

https://crpplocal.epfl.ch/pinboard/jpapers/1402503.pdf
Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
CRPP  
SPC  
Available on Infoscience
March 17, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/112553
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