Conceptual Approach to Steady State Reversed field Pinch Reactor with Low Aspect Ratio

S. SHIINA, Y. NAGAMINE, Y. OSANAI, K.N. SAITO, K.H.SAITO, M. AIZAWA,
M. WATANABE,1),
M. TAGUCHI2), Y. KONDOH3)



1)Institute of Quantum Science,College of Science and Technology,Nihon University,
2)College of Industrial Technology,Nihon University,
3)Department of Electronic engineering,Gunma University,

According to a simplified costing algorithm of steady state fusion reactor power plant, the relative attractiveness of advanced physics modes mainly depends on the stability and non-inductive current drive of the equilibria. Two types of target magnetohydrodynamic (MHD) equilibria for reversed field pinch (RFP) with low aspect ratio are considered. The first is the classical one described by partially relaxed state model (PRSM), which is reasonably close to dynamo-free, stable minimum energy state at finite beta. The second is the neoclassical one solved self-consistently considering the bootstrap current, which enhances the plasma stability due to the hollow current profile increasing the magnetic shear locally and globally. The high stability beta and the good alignment of the current profile with plasma self-induced current profile are compatible for the neoclassical equilibrium with a relatively flat plasma pressure profile, offering the lowest cost of electricity for fusion power plant.