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Three dimensional double layers in magnetized plasmas
Author(s) -
Jovanović D.,
Lynov J. P.,
Michelsen P.,
Pécseli H. L.,
Rasmussen J. Juul,
Thomsen K.
Publication year - 1982
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl009i009p01049
Subject(s) - gyroradius , plasma , radius , magnetic field , electron , atomic physics , physics , double layer (biology) , beam (structure) , drop (telecommunication) , perpendicular , electron temperature , layer (electronics) , materials science , optics , nuclear physics , telecommunications , computer security , geometry , mathematics , quantum mechanics , computer science , composite material
Experimental results are presented which demonstrate the formation of fully three dimensional double layers in a magnetized plasma. The measurements are performed in a magnetized stationary plasma column with radius 1.5 cm. Double layers are produced by introducing an electron beam with radius 0.4 cm along the magnetic field from one end of the column. The voltage drop across the double layer is found to be determined by the energy of the incoming electron beam. In general we find that the width of the double layer along the external magnetic field is determined by plasma density and beam energy, while the ion Larmor radius gives a characteristic width in the perpendicular direction. The electrons are strongly magnetized for all experimental conditions considered here.