 |
 |
 |
Z. Yoshida, Y. Ogawa, J. Morikawa, H. Himura,
S. Kondo, M. Hashimoto, T. Hirotsu, K. Takemura,
H. Kakuno, C. Nakashima, N. Shibayama, S. Tahara,
M. Iqbal, S. M. Mahajan1
University of Tokyo, Hongo, Tokyo 113-8656, Japan
1University of Texas, Austin, Texas 78712, U.S.A.
Abstract. Departure from the quasi-neutral condition allows us to apply
significant two-fluid effects that impart a new freedom to the design of
high-performance fusion plasma. The self-electric field in a non-neutralized
plasma induces a strong
E×B-drift flow. A fast flow produces a
large hydrodynamic pressure that can balance with the thermal pressure of
the plasma. Basic concepts to produce a toroidal non-neutral plasma have
been examined on the internal-conductor toroidal confinement device
Proto-RT. A magnetic separatrix determines the boundary of the confiment
region. Electrons describe chaotic orbits in the neighborhood of the
magnetic null point on the separatrix. The chaos yields collisionless
diffusion of electrons from the particle source (electron gun) towards the
confinement region. Collisionless heating also occurs in the magnetic null
region, which can be applied to produce a plasma.
IAEA 2001
