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Journal Articles

Isotope and plasma size scaling in ion temperature gradient driven turbulence

Idomura, Yasuhiro

Physics of Plasmas, 26(12), p.120703_1 - 120703_5, 2019/12

 Times Cited Count:5 Percentile:32.68(Physics, Fluids & Plasmas)

This Letter presents the impacts of the hydrogen isotope mass and the normalized gyroradius $$rho^*$$ on L-mode like hydrogen (H) and deuterium (D) plasmas dominated by ion temperature gradient driven (ITG) turbulence using global full-f gyrokinetic simulations. In ion heated numerical experiments with adiabatic electrons, the energy confinement time shows almost no isotope mass dependency, and is determined by Bohm like $$rho^*$$ scaling. Electron heated numerical experiments with kinetic electrons show clear isotope mass dependency caused by the isotope effect on the collisional energy transfer from electrons to ions, and the H and D plasmas show similar ion and electron temperature profiles at an H to D heating power ratio of $$sim 1.4$$. The normalized collisionless ion gyrokinetic equations for H and D plasmas become identical at the same $$rho^*$$, and collisions weakly affect ITG turbulence. Therefore, the isotope mass dependency is mainly contributed by the $$rho^*$$ scaling and the heating sources.

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