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Study of ion turbulent transport and profile formations using global gyrokinetic full-$$f$$ Vlasov simulation

Idomura, Yasuhiro   ; Urano, Hajime; Aiba, Nobuyuki; Tokuda, Shinji

Key features of ion turbulent transport in a normal shear tokamak with on-axis heating are clarified using a global gyrokinetic full-$$f$$ Vlasov simulation with sources and collisions. It is found that stiff ion temperature $$T_i$$ profiles are sustained with globally constant gradient scale length $$L_{ti}equiv |T_i/T'_i|$$ near a critical value, and a significant part of the heat flux is carried by avalanches with $$1/f$$ type spectra, which suggest a self-organized criticality. The directions of avalanche propagation and the momentum flux are strongly affected by the shear of the equilibrium radial electric field $$E_r$$, which is determined by a parallel momentum balance. Nondiffusive momentum transport due to the $$E_r$$ shear stress is observed and a non-zero (intrinsic) toroidal rotation is formed without momentum input near the axis.

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Category:Physics, Fluids & Plasmas

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