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Gyrokinetic simulations of electrostatic microturbulence in ADITYA-U tokamak

Singh, T and Sharma, D and Macwan, T and Sharma, S and Ghosh, J and Sen, A and Lin, Z and Kuley, A (2023) Gyrokinetic simulations of electrostatic microturbulence in ADITYA-U tokamak. In: Nuclear Fusion, 63 (5).

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Official URL: https://doi.org/10.1088/1741-4326/acc344


Global gyrokinetic simulations of the electrostatic microturbulence driven by the pressure gradients of thermal ions and electrons are carried out for the ADITYA-U tokamak geometry using its experimental plasma profiles and with collisional effects. The dominant instability is trapped electron mode (TEM) based on the linear eigenmode structure and its propagation in the electron diamagnetic direction. Collisional effects suppress turbulence and transport to a certain extent. Zonal flow is not playing a critical role in the TEM saturation, which is dominated by the inverse cascade. The frequency spectrum of the electrostatic fluctuations is in broad agreement with the experimentally recorded spectrum in the ADITYA-U, with a bandwidth ranging from ∼ 0 to 50 kHz.

Item Type: Journal Article
Publication: Nuclear Fusion
Publisher: Institute of Physics
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Collisional plasmas; Magnetoplasma; Tokamak devices, Collisional effects; Gyrokinetic simulations; Gyrokinetics; Microturbulence; Simulation; Thermal electron; Thermal ions; Tokamak; Tokamak geometry; Trapped electron modes, Electrostatics
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 21 Apr 2023 06:44
Last Modified: 21 Apr 2023 06:44
URI: https://eprints.iisc.ac.in/id/eprint/81316

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