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Author Sudan, R. N. ♦ Omelchenko, Y. A.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION ♦ ION RINGS ♦ BEAM-PLASMA SYSTEMS ♦ MAGNETIC FIELD REVERSAL ♦ BEAM BUNCHING ♦ TRAPPED PROTONS ♦ COMPUTERIZED SIMULATION ♦ CYLINDRICAL CONFIGURATION ♦ CUSPED GEOMETRIES ♦ HYDROGEN ♦ THERMONUCLEAR DEVICES
Abstract In typical field-reversed ion ring experiments, an intense annular ion beam is injected across a plasma-filled magnetic cusp region into a neutral gas immersed in a ramped solenoidal magnetic field. Assuming the characteristic ionization time is much shorter than the long ({ital t}{approx_gt}2{pi}/{Omega}{sub {ital i}}) beam evolution time scale, we investigate the formation of an ion ring in the background plasma followed by field reversal, using a 21/2-D hybrid, PIC code FIRE, in which the beam and background ions are treated as particles and the electrons as a massless fluid. We show that beam bunching and trapping occurs downstream in a ramped magnetic field for an appropriate set of experimental parameters. We find that a compact ion ring is formed and a large field reversal {zeta}={delta}{ital B}/{ital B}{approx_gt}1 on axis develops. We also observe significant deceleration of the ring on reflection due to the transfer of its axial momentum to the background ions, which creates favorable trapping conditions. {copyright} {ital 1995 American Institute of Physics.}
ISSN 0094243X
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-09-01
Publisher Place United States
Volume Number 345
Issue Number 1
Technical Publication No. CONF-9410130-


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