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Related Concept Videos

Magnetic Field Of A Current Loop01:16

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Related Experiment Video

Updated: Mar 11, 2026

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
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The rectangular array of magnetic probes on J-TEXT tokamak.

Zhipeng Chen1, Fuming Li1, Ge Zhuang1

  • 1State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

The Review of Scientific Instruments
|December 3, 2016
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Summary

A new magnetic probe system on the J-TEXT tokamak accurately measures plasma fields. These measurements aid in plasma equilibrium reconstruction and validate theoretical models.

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Area of Science:

  • Plasma physics
  • Magnetic confinement fusion
  • Tokamak diagnostics

Background:

  • Accurate measurement of magnetic fields is crucial for understanding and controlling plasma behavior in tokamaks.
  • Existing diagnostic limitations necessitate novel approaches for in-situ magnetic field characterization.

Purpose of the Study:

  • To design, install, and validate a novel rectangular array of magnetic probes for J-TEXT tokamak.
  • To measure local magnetic fields outside the last closed flux surface at a specific toroidal angle.
  • To assess the utility of these measurements for plasma equilibrium reconstruction.

Main Methods:

  • Installation of a rectangular magnetic probe array within the J-TEXT tokamak.
  • Comparison of experimental magnetic field measurements with theoretical predictions from the Spool model and a 3D finite element model.
  • Utilizing probe data as input for the EFIT code for plasma equilibrium reconstruction.
  • Validation against measurements from a three-wave polarimeter-interferometer system.

Main Results:

  • Experimental results closely matched theoretical predictions when a vertical field was applied.
  • Successful application of probe measurements for plasma equilibrium reconstruction using the EFIT code.
  • Calculated Faraday rotation angles from EFIT output agreed well with experimental polarimetry data.

Conclusions:

  • The newly designed magnetic probe system is a reliable diagnostic for J-TEXT.
  • The system effectively contributes to accurate plasma equilibrium reconstruction.
  • The validated measurements enhance the understanding of magnetic field behavior in tokamak plasmas.