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Effective Critical Electric Field for Runaway-Electron Generation

Adam Stahl (Institutionen för teknisk fysik, Nukleär teknik) ; Eero Hirvijoki (Institutionen för teknisk fysik, Nukleär teknik) ; Joan Decker ; Ola Embréus (Institutionen för teknisk fysik, Nukleär teknik) ; Tünde Fülöp (Institutionen för teknisk fysik, Nukleär teknik)
Physical Review Letters (0031-9007). Vol. 114 (2015), 11, p. 115002.
[Artikel, refereegranskad vetenskaplig]

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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Denna post skapades 2015-03-06. Senast ändrad 2016-10-14.
CPL Pubid: 213436


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)


Plasmafysik med fusion

Chalmers infrastruktur

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