Global gyrokinetic simulations of electrostatic microturbulent transport using kinetic electrons in LHD stellarator

Singh, T and Nicolau, JH and Lin, Z and Sharma, S and Sen, A and Kuley, A (2022) Global gyrokinetic simulations of electrostatic microturbulent transport using kinetic electrons in LHD stellarator. In: Nuclear Fusion, 62 (12).

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Abstract

Global gyrokinetic simulations of ion temperature gradient (ITG) and trapped electron mode (TEM) in the LHD stellarator are carried out using the gyrokinetic toroidal code (GTC) with kinetic electrons. ITG simulations show that kinetic electron effects increase the growth rate by more than 50 and more than double the turbulent transport levels compared with simulations using adiabatic electrons. Zonal flow dominates the saturation mechanism in the ITG turbulence. Nonlinear simulations of the TEM turbulence show that the main saturation mechanism is not the zonal flow but the inverse cascade of high to low toroidal harmonics. Further nonlinear simulations with various pressure profiles indicate that the ITG turbulence is more effective in driving heat conductivity whereas the TEM turbulence is more effective for particle diffusivity.

Item Type:	Journal Article
Publication:	Nuclear Fusion
Publisher:	Institute of Physics
Additional Information:	The copyright for this article belongs to Institute of Physics.
Keywords:	Electrons; Kinetics; Trapped ions; Turbulence, Gyrokinetic simulations; Gyrokinetics; Ion temperature gradient; Kinetic electrons; Microturbulence; Nonlinear simulations; Simulation; Temperature gradient turbulence; Trapped electron modes; Zonal flows, Magnetohydrodynamics
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	28 Oct 2022 05:12
Last Modified:	28 Oct 2022 05:12
URI:	https://eprints.iisc.ac.in/id/eprint/77616

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