TY - JOUR
T1 - Rotating Spokes, Ionization Instability, and Electron Vortices in Partially Magnetized E× B Plasmas
AU - Boeuf, Jean Pierre
AU - Takahashi, Masayuki
N1 - Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/5/8
Y1 - 2020/5/8
N2 - Regions of enhanced light emission rotating in the azimuthal direction are present in various E×B plasma devices. A kinetic model reveals that these "rotating spokes" are due to electron heating and enhanced ionization localized along a double layer at the interface between a region of large electric field and a quasi-equipotential region close to the anode potential. Electrons drifting along this interface are heated due to ∇B drift in the large electric field region. The formation of electron vortices due to the velocity shear in the double layer also contributes to electron heating. The possibility for spoke motion in the retrograde E×B direction as well as in the E×B direction, observed experimentally, can be reproduced and explained.
AB - Regions of enhanced light emission rotating in the azimuthal direction are present in various E×B plasma devices. A kinetic model reveals that these "rotating spokes" are due to electron heating and enhanced ionization localized along a double layer at the interface between a region of large electric field and a quasi-equipotential region close to the anode potential. Electrons drifting along this interface are heated due to ∇B drift in the large electric field region. The formation of electron vortices due to the velocity shear in the double layer also contributes to electron heating. The possibility for spoke motion in the retrograde E×B direction as well as in the E×B direction, observed experimentally, can be reproduced and explained.
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U2 - 10.1103/PhysRevLett.124.185005
DO - 10.1103/PhysRevLett.124.185005
M3 - Article
C2 - 32441952
AN - SCOPUS:85084745884
VL - 124
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 18
M1 - 185005
ER -