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Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
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Boundary displacement measurements using multi-energy soft x-rays.

K Tritz1, A Diallo2, B P LeBlanc2

  • 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.

The Review of Scientific Instruments
|November 29, 2014
PubMed
Summary
This summary is machine-generated.

The Multi-Energy Soft X-ray system now measures plasma boundary displacement with millimeter accuracy during magnetohydrodynamic activity. This advancement aids in understanding plasma edge dynamics and controlling fusion devices.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • X-ray Diagnostics

Background:

  • The Multi-Energy Soft X-ray (ME-SXR) system on the National Spherical Torus Experiment (NSTX) has been crucial for reconstructing electron temperature profiles at high time resolution (∼10 kHz).
  • Accurate measurement of plasma boundary dynamics is essential for understanding and controlling fusion plasmas.

Purpose of the Study:

  • To demonstrate the capability of the ME-SXR system for measuring plasma boundary displacement with high spatial resolution.
  • To explore the application of these measurements in studying magnetohydrodynamic (MHD) activity and edge phenomena.
  • To assess the potential for real-time feedback control using filtered X-ray measurements.

Main Methods:

  • Utilizing the existing ME-SXR system on NSTX, which employs filters of varying thickness to measure soft X-ray emission.
  • Analyzing the filtered soft X-ray signals to reconstruct the plasma boundary position with millimeter accuracy.
  • Correlating boundary displacement measurements with observed MHD activity.

Main Results:

  • The ME-SXR system successfully measured plasma boundary displacement with a spatial resolution of a few millimeters during MHD events.
  • These measurements provide valuable data for validating theoretical models of neoclassical toroidal viscosity.
  • The results indicate the potential for using filtered SXR measurements to analyze pedestal dynamics and edge localized modes (ELMs).

Conclusions:

  • The ME-SXR system offers a novel capability for precise boundary displacement measurements in fusion plasmas.
  • These measurements are critical for advancing the understanding of plasma edge physics and MHD phenomena.
  • Future work will focus on developing simplified SXR systems for real-time feedback control of plasma position and instabilities like ELMs.