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Local current density measurement using a Rogowski probe in Tokyo Spherical Tokamak-2.

H Furui1, Y Nagashima2, Y Takase1

  • 1The University of Tokyo, 5-1-5 Kasshiwanoha, Kashiwa, Chiba 277-8561, Japan.

The Review of Scientific Instruments
|November 29, 2014
PubMed
Summary

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This summary is machine-generated.

A new Rogowski probe precisely measures plasma current density and direction. This advancement aids in understanding plasma behavior within fusion devices like the Tokyo Spherical Tokamak-2.

Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Diagnostic Instrumentation

Background:

  • Accurate measurement of local current density is crucial for understanding plasma confinement and stability in fusion devices.
  • Previous diagnostic methods may have limitations in spatial resolution or directional sensitivity.

Purpose of the Study:

  • To develop and validate a novel Rogowski probe for measuring local current density and its direction.
  • To investigate the current density profile near the last closed flux surface in Ohmic plasmas.

Main Methods:

  • Development of a multi-layer Rogowski coil integrated with magnetic pick-up coils and a Langmuir probe.
  • Implementation of a movable and rotatable probe system for detailed spatial mapping.
  • Application of the probe in the Tokyo Spherical Tokamak-2 (TST-2) Ohmic plasma experiments.

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Main Results:

  • Successful measurement of the local current density and its direction using the developed probe.
  • Acquisition of the current density profile near the last closed flux surface.
  • Achieved a high signal-to-noise ratio (greater than 20) for the measurements.

Conclusions:

  • The developed Rogowski probe is an effective diagnostic tool for precise current density measurements in tokamak plasmas.
  • The probe's mobility and directional sensitivity allow for detailed profiling critical for fusion research.
  • The successful application in TST-2 demonstrates its utility in studying plasma behavior.