Gyrokinetic simulations of electrostatic microturbulence in ADITYA-U tokamak

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...

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Bibliographic Details
Published in:Nuclear fusion 2023-05, Vol.63 (5), p.56008
Main Authors: Singh, Tajinder, Sharma, Deepti, Macwan, Tanmay, Sharma, Sarveshwar, Ghosh, Joydeep, Sen, Abhijit, Lin, Zhihong, Kuley, Animesh
Format: Article
Language:English
Subjects:
gyrokinetic
microturbulence
physics
simulation
tokamak
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Summary: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.
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/acc344