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Electromagnetic waves destabilized by runaway electrons in near-critical electric fields

A Kómár ; Gergö Pokol ; Tünde Fülöp (Institutionen för teknisk fysik, Nukleär teknik)
Physics of Plasmas (1070-664X). Vol. 20 (2013), 1, p. 012117.
[Artikel, refereegranskad vetenskaplig]

Runaway electron distributions are strongly anisotropic in velocity space. This anisotropy is a source of free energy that may destabilize electromagnetic waves through a resonant interaction between the waves and the energetic electrons. In this work, we investigate the high-frequency electromagnetic waves that are destabilized by runaway electron beams when the electric field is close to the critical field for runaway acceleration. Using a runaway electron distribution appropriate for the near-critical case, we calculate the linear instability growth rate of these waves and conclude that the obliquely propagating whistler waves are most unstable. We show that the frequencies, wave numbers, and propagation angles of the most unstable waves depend strongly on the magnetic field. Taking into account collisional and convective damping of the waves, we determine the number density of runaways that is required to destabilize the waves and show its parametric dependences.



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Denna post skapades 2013-02-27. Senast ändrad 2015-02-26.
CPL Pubid: 174208

 

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Institutioner (Chalmers)

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

Ämnesområden

Energi
Hållbar utveckling
Plasmafysik
Fusion
Plasmafysik med fusion

Chalmers infrastruktur