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Related Experiment Videos

Magnetic probe array with high sensitivity for fluctuating field.

Yuki Kanamaru1, Hiroshi Gota, Kayoko Fujimoto

  • 1College of Science and Technology, Nihon University, Tokyo 101-8308, Japan.

The Review of Scientific Instruments
|April 7, 2007
PubMed
Summary
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A new magnetic probe array precisely measures small, fluctuating fields within strong, time-varying confinement fields. This advanced diagnostic tool enhances detection of high-mode number fluctuations in plasma experiments.

Area of Science:

  • Plasma Physics
  • Magnetic Confinement Fusion
  • Diagnostic Techniques

Background:

  • Accurate measurement of small magnetic fields within larger, dynamic fields is crucial for understanding plasma behavior.
  • Existing methods struggle to isolate and characterize localized field fluctuations in complex magnetic environments.
  • Time-varying confinement fields complicate precise spatial measurements of embedded fluctuating fields.

Purpose of the Study:

  • To develop and validate a novel magnetic probe array for precisely measuring the spatial structure of small fluctuating magnetic fields.
  • To differentiate and isolate weak fluctuating fields from strong, time-varying confinement fields.
  • To demonstrate the sensitivity of the probe array to different spatial modes of magnetic fluctuations.

Main Methods:

Related Experiment Videos

  • Construction of a magnetic probe array using figure-eight-wound coils to minimize sensitivity to the main confinement field.
  • Application of Fourier analysis to probe signals for determining the spatial structure of the fluctuating field.
  • Experimental validation using a field-reversed configuration plasma to detect low-amplitude magnetic fluctuations.

Main Results:

  • The developed magnetic probe array successfully measured the spatial structure of a small fluctuating field within a strong confinement field.
  • The probe array demonstrated higher sensitivity to high-mode number fluctuations compared to low-mode number fluctuations.
  • Fluctuating magnetic fields, as small as 0.1% of the confinement field, were successfully detected in a field-reversed configuration plasma.

Conclusions:

  • The figure-eight coil magnetic probe array is an effective diagnostic for precisely measuring spatial structures of small fluctuating fields in strong, time-varying magnetic fields.
  • The method allows for detailed analysis of plasma dynamics by resolving fluctuations with different spatial modes.
  • This technique offers a significant advancement in plasma diagnostics, particularly for experiments like field-reversed configurations.