Sensitivity of External Magnetic Field on the Change in Cross-section of a Toroidal Current

TL;DR

This paper investigates how external magnetic fields influence the cross-sectional area of a toroidal current, validating numerical predictions through experimental measurements on the Aditya Upgrade tokamak.

Contribution

The study experimentally confirms the sensitivity and invariance of magnetic fields to the cross-sectional area of toroidal currents as predicted by previous numerical models.

Findings

Magnetic field sensitivity varies with location around the toroid.

Presence of an angle of invariance in magnetic field behavior.

Experimental validation of numerical predictions.

Abstract

Due to any toroidal current column, the magnetic field is found to be sensitive as well as insensitive to its cross-sectional area depending on location of subject point, as predicted by numerical approaches [S. Aich, J. Thakkar, and J. Ghosh, Plasma Fusion Res. 17, 2403055 (2022)], and hence the presence of an angle of invariance is found to be present for any toroidal geometry. Present study aims to validate those numerical observations using the measured magnetic field due to Aditya Upgrade tokamak plasma.