Analysis of the coupling characteristics of ion cyclotron resonance heating antenna of small tokamak with the help of 2D and 3D antenna codes

• Published in: Pramāṇa Vol. 97; no. 3
• Main Author: Chattopadhyay, Asim Kumar
• Format: Journal Article
• Language: English
• Published: New Delhi Springer India 09.08.2023
• Subjects: Astronomy; Astrophysics and Astroparticles; Observations and Techniques; Physics; Physics and Astronomy; 52.55.Fa; ICRF antenna code; 52.50.Qt; Aditya-U and SST-1 antenna coupling; simulation of ICRH antenna resistance; strip-line antenna; 52.40.Fd; SITAR
• ISSN: 0973-7111; 0973-7111
• DOI: 10.1007/s12043-023-02604-2

An analytical and numerical study of the coupling of strip-line antenna with small tokamak plasma is presented with the help of the ICRH antenna code SITAR (Simulation of ICRH anTennaA Resistance). The antenna is of finite poloidal and toroidal dimensions and screened from the plasma by a metal screen of anisotropic conductivity that shorts out the toroidal components of radio frequency electric field. A linear model of refractive index in plasma evanescent region has been considered to describe the propagation of wave in it. The plasma in the coupling region is described by cold plasma dielectric tensors with non-uniform density and toroidal magnetic field along the radial direction. Inclusion of finite antenna length, antenna lead currents as well as toroidal and poloidal variation of current in it (3D analysis) introduces an important difference in the antenna load resistance and inductance compared to those calculations when lead current is ignored and plasma is assumed to be invariant along the poloidal direction (2D analysis). The effect of plasma density, antenna length, wall and plasma edge distances on antenna load resistance and inductance has been studied using parameters of Aditya-U and SST-1 tokamaks.