Fiksel G, Hudson B, Den Hartog D J, Magee R M, O'Connell R, Prager S C, Beklemishev A D, Davydenko V I, Ivanov A A, Tsidulko Yu A
Department of Physics, University of Wisconsin--Madison and Center for Magnetic Self Organization in Laboratory and Astrophysical Plasmas, Madison, Wisconsin 53706, USA.
Phys Rev Lett. 2005 Sep 16;95(12):125001. doi: 10.1103/PhysRevLett.95.125001. Epub 2005 Sep 14.
Fast ions are observed to be very well confined in the Madison Symmetric Torus reversed field pinch despite the presence of stochastic magnetic field. The fast-ion energy loss is consistent with the classical slowing down rate, and their confinement time is longer than expected by stochastic estimates. Fast-ion confinement is measured from the decay of d-d neutrons following a short pulse of a 20 keV atomic deuterium beam. Ion confinement agrees with computation of particle trajectories in the stochastic magnetic field, and is understood through consideration of ion guiding center islands.
