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Development of a diamagnetic loop in KAIMIR.

M Choe1, D Oh1, J G Bak2

  • 1Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.

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Summary
This summary is machine-generated.

Researchers developed a novel diamagnetic loop system to accurately measure plasma stored energy. This system significantly reduces noise, improving signal-to-noise ratio for reliable magnetic mirror device diagnostics.

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Area of Science:

  • Plasma Physics
  • Magnetic Confinement Fusion

Background:

  • Diamagnetic loops are crucial for estimating plasma stored energy by measuring diamagnetic flux.
  • Vacuum flux often overwhelms diamagnetic signals, necessitating advanced noise reduction techniques.
  • High signal-to-noise ratio is critical for accurate diamagnetic flux measurements.

Purpose of the Study:

  • To develop an improved diamagnetic loop system for accurate plasma stored energy estimation.
  • To significantly reduce background noise and enhance the signal-to-noise ratio in measurements.
  • To validate the developed system against established diagnostic methods.

Main Methods:

  • Utilized two identical diamagnetic loops with opposite polarities to cancel parasitic capacitive noise and amplify inductive signals.
  • Employed two coaxial loops of different radii at the same axial location to eliminate vacuum flux.
  • Configured six paired loops to ensure robust noise and vacuum flux suppression.

Main Results:

  • Successfully removed parasitic capacitive noise, amplifying the inductive signal twofold.
  • Effectively eliminated vacuum flux through the coaxial loop configuration.
  • Demonstrated excellent agreement between plasma stored energy measurements from the developed diamagnetic loop and Langmuir probe data.

Conclusions:

  • The novel diamagnetic loop system provides accurate plasma stored energy measurements in magnetic mirror devices.
  • The employed noise reduction and vacuum flux elimination techniques significantly improve diagnostic reliability.
  • This advancement offers a more precise tool for understanding plasma behavior in fusion research.