Abstract
For the evaluation of confinement property of a low aspect ratio reversed field pinch (RFP) plasma, diffusive transport analysis is studied. Numerical analysis based on the neoclassical transport model in a low aspect ratio RFP show that a considerable bootstrap current contibution can be expected in this configuration, when incorporating the effects of non-circular cross-section and low aspect ratio. So-called neclassical RFP equilibrium are also found to attain both high stablity beta limit and high bootstrap current fraction. However, of transport phenomena in an RFP, the energy confinement time τE might be determined by anomalous transport due to micro-instabilities. To analyze such transport phenomena in a low aspect ratio RFP, the applicability of the TASK (Transport Analysing System for TokamaK) simulation code are considered.
Highlights
To evaluate confinement properties of the low aspect ratio reversed field pinch (RFP) plasma, diffusive transport analysis including the neoclassical and turbulent transport models is studied
We focus on the low aspect ratio configuration with shaped magnetic surface and neoclassical effects
A consideration of neoclassical effect in the RFP equilibrium has led to a significant fraction of bootstrap current in a low aspect ratio, which is quite important to a steady state operation as well as to a high beta stability [9]
Summary
1. Introduction To evaluate confinement properties of the low aspect ratio reversed field pinch (RFP) plasma, diffusive transport analysis including the neoclassical and turbulent transport models is studied. We focus on the low aspect ratio configuration with shaped magnetic surface and neoclassical effects. We apply TASK code [4] to the RFP configuration.
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