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Department of Material Science, Hiroshima University, Hiroshima,
Japan
Department of Electronic Engineering, Gunma University, Kiryu,
Japan
H. Gesso, Y. Osanai, K. N. Saito, R. Ukai,
T. Nanba, Y. Nagamine, S. Shiina
Atomic Energy Research Institute, College of Science and
Technology, Nihon University, Tokyo, Japan
Abstract. Before the generation of steady state, dynamo-free RFP configuration
by rf current driving scheme, it is necessary to find an optimum
configuration into high stability beta limit against m=1 resonant resistive
MHD modes and reducing nonlinearly turbulent level with less rf power. As
first step to the optimization study, we are interested in partially relaxed
state model (PRSM) RFP configuration, which is considerd to be closer to a
relaxed state at finite beta since it has force-free fields for poloidal
direction with a relatively shorter characteristic length of relaxation and
a relatively higher stability beta limit to m=1 resonant ideal MHD modes.
The stability beta limit to m=1 resonant resistive MHD modes can be
predicted to be relatively high among other RFP models and to be enhanced by
the current density profile control using fast magnetosonic waves (FMW),
which are accessible to high density region with strong absorption rate.
IAEA 2001
