Abstract

Collisionless confinement of monoenergetic α particles in three-dimensional magnetic fields produced by the magnetic coils of the Large Helical Device is calculated. It is found that the inward shift of the magnetic axis due to the vertical field improves the α-particle confinement. In contrast to the vertical field, both large positive and negative hexapole fields do not improve the confinement. The study of the β effect and Mercier criterion calculations for different hexapole fields are also presented.

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