Observation of weak impact of a stochastic magnetic field on fast-ion confinement.
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.
Fiksel
G
G
Department of Physics, University of Wisconsin--Madison and Center for Magnetic Self Organization in Laboratory and Astrophysical Plasmas, Madison, Wisconsin 53706, USA.
Hudson
B
B
Den Hartog
D J
DJ
Magee
R M
RM
O'Connell
R
R
Prager
S C
SC
Beklemishev
A D
AD
Davydenko
V I
VI
Ivanov
A A
AA
Tsidulko
Yu A
YA