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Abstract <p>The paper presents the development and experimental testing of a small-scale prototype of a toroidal coil for a spherical tokamak and a system for recording three-component magnetic fields. The primary objective of the study is to develop an instrumental framework to investigate the effect of the geometric features of a continuous toroidal solenoid on high-temperature plasma confinement. A&#xa0;1&#xa0;:&#xa0;3-scale prototype of the toroidal coil for the MEPhIST-1 tokamak was fabricated with a modular assembly design that enabled installation of diagnostic equipment across various poloidal sections. A&#xa0;printed circuit board was developed to measure the magnetic field. It features an array of digital Hall sensors, embedded microcontrollers for synchronized polling, and autonomous real-time data acquisition. The system’s architecture is designed to record vertical and radial small stray fields against the background of a large toroidal field. The completed complex was tested using direct current through the coil. Initial measurements confirmed the correct registration of the magnetic field components. Despite noise at low currents, the system recorded stable distributions comparable to calculated values as the current was increased.</p>

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A Small-Scale Prototype of a Spherical Tokamak Toroidal Coil for Measuring Magnetic Fields

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • E. A. Vinitskiy,
  • A. S. Drozd,
  • E. V. Khitrova,
  • M. A. Osipov,
  • S. A. Krat

摘要

Abstract

The paper presents the development and experimental testing of a small-scale prototype of a toroidal coil for a spherical tokamak and a system for recording three-component magnetic fields. The primary objective of the study is to develop an instrumental framework to investigate the effect of the geometric features of a continuous toroidal solenoid on high-temperature plasma confinement. A 1 : 3-scale prototype of the toroidal coil for the MEPhIST-1 tokamak was fabricated with a modular assembly design that enabled installation of diagnostic equipment across various poloidal sections. A printed circuit board was developed to measure the magnetic field. It features an array of digital Hall sensors, embedded microcontrollers for synchronized polling, and autonomous real-time data acquisition. The system’s architecture is designed to record vertical and radial small stray fields against the background of a large toroidal field. The completed complex was tested using direct current through the coil. Initial measurements confirmed the correct registration of the magnetic field components. Despite noise at low currents, the system recorded stable distributions comparable to calculated values as the current was increased.