Importance of two-fluid effects at experimentally relevant resistivity

Determine whether two-fluid effects remain comparably important for intermode energy transfer in experimentally relevant resistivity regimes of reversed-field pinch plasmas.

Background

The simulations use Lundquist and Reynolds numbers of order 10^4, placing them in a substantially more dissipative regime than present reversed-field pinch experiments. Under these conditions, single-fluid simulations can maintain a sawtooth-free flux-pumping state, while the inclusion of two-fluid effects produces Hall-mediated nonlinear energy redistribution and quasi-periodic sawtooth relaxation.

The authors note that increasing the Lundquist number could cause strong nonlinear coupling and sawtooth activity even in the single-fluid model. It therefore remains unresolved whether two-fluid physics continues to play a comparably important role in intermode energy transfer under experimentally relevant, higher-Lundquist-number conditions.