Lagrangian neoclassical transport theory applied to the region near the magnetic axis | Zendy

S. Satake | Zendy; Masao Okamoto | Zendy; H. Sugama | Zendy

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Lagrangian neoclassical transport theory applied to the region near the magnetic axis

Author(s) -

S. Satake,

Masao Okamoto,

H. Sugama

Publication year - 2002

Publication title -

physics of plasmas

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.75

H-Index - 160

eISSN - 1089-7674

pISSN - 1070-664X

DOI - 10.1063/1.1499952

Subject(s) - collisionality , physics , thermal conductivity , plasma , transport theory , tokamak , momentum (technical analysis) , angular momentum , quantum electrodynamics , lagrangian , classical mechanics , quantum mechanics , statistical physics , mathematical physics , finance , economics

"Neoclassical transport theory around the magnetic axis of a tokamak is studied, in which relatively wide ""potato"" orbits play an important role in transport. Lagrangian formulation of transport theory, which has been investigated to reflect finiteness of guiding-center orbit widths to transport equations, is developed in order to analyze neoclassical transport near the axis for a low-collisionality plasma. The treatment of self-collision term in Lagrangian formulation is revised to retain momentum conservation property of it. By directly reflecting the orbital properties of all the types of orbits in calculation, the ion thermal conductivity around the axis is found to decrease from that predicted by conventional neoclassical theory. This result supports recent numerical simulations which show the reduction of thermal conductivity near the magnetic axis.

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