A guiding-centre computer code is used to map out trajectories of collisionless high-energy runaways in the presence of an m = 2 magnetic island in a tokamak. The particle drift surfaces retain the island structure even when the drift orbits are considerably shifted from the flux surfaces, and trapped-particle orbits are observed to be unaffected by the presence of the island.
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Zweben et al. (1980) studied this question.
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