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Title: Rigid-body rotation of an electron cloud in divergent magnetic fields

For a given voltage across a divergent poloidal magnetic field, two electric potential distributions, each supported by a rigid-rotor electron cloud rotating with a different frequency, are found analytically. The two rotation frequencies correspond to the slow and fast rotation frequencies known in uniform plasma. Due to the centrifugal force, the equipotential surfaces, that correspond to the two electric potential distributions, diverge more than the magnetic surfaces do, the equipotential surfaces in the fast mode diverge largely in particular. The departure of the equipotential surfaces from the magnetic field surfaces may have a significant focusing effect on the ions accelerated by the electric field. Furthermore, the focusing effect could be important for laboratory plasma accelerators as well as for collimation of astrophysical jets.
Authors:
 [1] ;  [2] ;  [2]
  1. H.I.T. -Holon Institute of Technology, Holon (Israel)
  2. Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab.
Publication Date:
OSTI Identifier:
1257711
Grant/Contract Number:
FG02-06ER54851
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 20; Journal Issue: 7; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Princeton Univ., Princeton, NJ (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
Holon Institute of Technology
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY surface magnetism; centrifugal force; magnetic fields; magnetic flux; surface dynamics