Alfvén Modes in the Plasma of T-15MD and TRT Tokamaks with a Negative Magnetic Shear

• Published in: Plasma physics reports Vol. 47; no. 11; pp. 1137 - 1150
• Main Authors: Isaev, M. Yu, Leonov, V. M., Medvedev, S. Yu
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.11.2021; Springer Nature B.V
• Subjects: Alpha particles; Alpha rays; Atomic; Deuterium; Heating; Landau damping; Molecular; Optical and Plasma Physics; Physics; Physics and Astronomy; Plasma; Plasma currents; Safety factors; Shear; Stability; Tokamak devices; Tokamaks; Tritium; tokamaks; Alfvén modes; simulation
• ISSN: 1063-780X; 1562-6938
• DOI: 10.1134/S1063780X21110180

The stability of the Alfvén eigenmodes (AE) in a plasma with negative magnetic shear excited by fast particles is analyzed for the T-15MD and TRT tokamaks. Scenarios with a negative shear for the T-15MD tokamak and for the new TRT tokamak with a magnetic field of up to 8 T, total plasma current of 4 MA, and additional injection heating with a power of up to 40 MW were calculated using the ASTRA code. The Alfvén modes in the T-15MD and TRT tokamaks can be excited by high-energy ions of the heating beam and by thermonuclear alpha particles in the deuterium–tritium plasma in TRT. The spatial structure and frequencies of various AEs with toroidal numbers n = 1–8 were calculated using the ideal MHD stability KINX code. Landau damping on ions of the main plasma, linear growth rates, nonlinear evolution of the amplitude of modes excited by fast particles, and the effect on particle losses are calculated using the VENUS code. The non-monotonic profile of the safety factor associated with auxiliary ECR heating with a power of 13 MW opens up additional possibilities for the excitation of modes on several magnetic surfaces. The results of numerical calculations of the Alfvén modes in the new TRT tokamak are compared with the results of tokamaks with similar parameters.