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Related Concept Videos

X-ray Imaging01:24

X-ray Imaging

German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...

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Compact "diode-based" multi-energy soft x-ray diagnostic for NSTX.

K Tritz1, D J Clayton, D Stutman

  • 1The Johns Hopkins University, Baltimore, Maryland 21218, USA. ktritz@pppl.gov

The Review of Scientific Instruments
|November 7, 2012
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Summary
This summary is machine-generated.

A new multi-energy soft x-ray (ME-SXR) diagnostic system was developed for the National Spherical Tokamak Experiment. This system enables fast measurements of electron temperature and density profiles in plasma.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • X-ray diagnostics

Background:

  • The National Spherical Tokamak Experiment (NSTX) requires advanced diagnostics for plasma characterization.
  • Existing diagnostic systems may have limitations in temporal or spatial resolution for certain plasma parameters.

Purpose of the Study:

  • To develop and test a novel, compact, diode-based, multi-energy soft x-ray (ME-SXR) diagnostic system.
  • To enable fast measurements of electron temperature and density profiles at the plasma edge.

Main Methods:

  • Development of a vertically stacked diode array system.
  • Utilizing independent pinholes and filters for tangential plasma viewing.
  • Employing computed x-ray spectral emission data for analysis.

Main Results:

  • The ME-SXR system provides simultaneous soft x-ray measurements with coarse spectral sub-sampling.
  • Fast (>10 kHz) measurements of electron temperature and density profile changes are achievable.
  • The system offers a method to complement and enhance data from multi-point Thomson scattering.

Conclusions:

  • The developed ME-SXR diagnostic is a compact and effective tool for NSTX.
  • It provides valuable, high-speed data on plasma electron temperature and density profiles.
  • This diagnostic enhances the capabilities for studying plasma edge dynamics.