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The ion temperature during magnetic reconnections measured along thedirection of the magnetic field at the MST Reverse Field Pinch has not yetreceived a satisfactory theoretical explanation. In this work we argue that itis consistent with a picture of ion energization by the parallel electricfields generated by the plasma during reconnection, and thermalization due tothe chaotic ion dynamics. Three possible sources of randomness are pointed out:particle motion along static stochastic magnetic field lines, breakup of theadiabatic ion dynamics caused by the strong gradient nonlinearity of themagnetic field, parallel acceleration along stochastic time-dependent electricfields. The three mechanisms are likely operative simultaneously; regardlessthe specific mechanism active, the correct scaling laws with ion parameters arerecovered. Furthermore, we argue that quantitative agreement can be obtained byfeeding the model with realistic values for the plasma conditions.

Modelling of impurity heating during reconnections in a Reverse Field  Pinch device as due to parallel electric field acceleration and chaos-induced  thermalization