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Topology of tokamak orbits [electronic resource].

Published
Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1978.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 44 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Guiding center orbits in noncircular axisymmetric tokamak plasmas are studied in the constants of motion (COM) space of (v, zeta, psi/sub m/). Here, v is the particle speed, zeta is the pitch angle with respect to the parallel equilibrium current, J/sub parallels/, and psi/sub m/ is the maximum value of the poloidal flux function (increasing from the magnetic axis) along the guiding center orbit. Two D-shaped equilibria in a flux-conserving tokamak having ..beta..'s of 1.3% and 7.7% are used as examples. In this space, each confined orbit corresponds to one and only one point and different types of orbits (e.g., circulating, trapped, stagnation and pinch orbits) are represented by separate regions or surfaces in the space. It is also shown that the existence of an absolute minimum B in the higher ..beta.. (7.7%) equilibrium results in a dramatically different orbit topology from that of the lower ..beta.. case. The differences indicate the confinement of additional high energy (v ..-->.. c, within the guiding center approximation) trapped, co- and countercirculating particles whose orbit psi/sub m/ falls within the absolute B well.
Report Numbers
E 1.99:ornl/tm-6352
ornl/tm-6352
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Other Subject(s)
Note
Published through SciTech Connect.
09/01/1978.
"ornl/tm-6352"
Rome, J.A.; Peng, Y.K.M.
Funding Information
W-7405-ENG-26
View MARC record | catkey: 14755034