Edge-Plasmas and Wall Protection in RFPs

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Abstract
The Reversed-Field Pinch (RFP) has the ability to operate as a compact, moderate-to-high beta, high-power-density system. A compact system requires careful control of the particle and heat fluxes impinging on plasma-facing components. A strongly recycling, toroidal-field open divertor combined with a highly radiating (>90% of plasma heating power) plasma is required. An open divertor configuration locates the plate near the field null to take advantage of flux expansion and minimum poloidal asymmetries to minimize peak heat fluxes. The physics and engineering requirements are quantitatively discussed for an evolutionary sequence of impurity/ash-control schemes for ZT-40M (0.4 MA)→ ZT-P (0.08 MA) → ZTH (2-4 MA)→ FTF/RFP (10 MA)→ TITAN (18 MA).

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