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Qin, Hong; Guan, Xiaoyin; Fisch, Nathaniel J.
Princeton Plasma Physics Laboratory, Princeton, NJ (United States). Funding organisation: USDOE Office of Science (United States)2011
Princeton Plasma Physics Laboratory, Princeton, NJ (United States). Funding organisation: USDOE Office of Science (United States)2011
AbstractAbstract
[en] In tokamaks, Ware pinch is a well known neoclassical effect for trapped particles in response to a toroidal electric field. It is generally believed that there exists no similar neoclassical effect for circulating particles without collisions. However, this belief is erroneous, and misses an important effect. We show both analytically and numerically that under the influence of a toroidal electric field parallel to the current, the circulating orbits drift outward toward the outer wall with a characteristic velocity O ((varepsilon)-1) larger than the E x B velocity, where (varepsilon) is the inverse aspect-ratio of a tokamak. During a RF overdrive, the toroidal electric field is anti-parallel to the current. As a consequence, all charged particles, including backward runaway electrons, will drift inward towards the inner wall.
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19 Jul 2011; 14 p; ACO2-09CH11466; Also available from OSTI as DE01029993; PURL: https://www.osti.gov/servlets/purl/1029993/; Nuclear Fusion (May 2011); doi 10.2172/1029993
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