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The high-k poloidal scattering system for NSTX-U.

R Barchfeld1, C W Domier1, Y Ren2

  • 1Department of Electrical and Computer Engineering, University of California, Davis, California 95616, USA.

The Review of Scientific Instruments
|November 8, 2018
PubMed
Summary

A new 8-channel, 693 GHz poloidal far-infrared scattering system enhances electron density fluctuation measurements on the National Spherical Torus eXperiment Upgrade (NSTX-U). This system extends wavenumber measurements to over 40 cm-1, providing crucial data for fusion energy research.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Wave phenomena in plasmas

Background:

  • High-k electron density fluctuations are critical for understanding turbulent transport in fusion devices.
  • Previous diagnostic limitations on NSTX-U restricted measurements to lower wavenumbers.
  • The National Spherical Torus eXperiment Upgrade (NSTX-U) requires advanced diagnostics to study plasma behavior.

Purpose of the Study:

  • To develop and implement an advanced 8-channel, 693 GHz poloidal far-infrared (FIR) scattering system for NSTX-U.
  • To extend the measurement capability of poloidal wavenumbers significantly beyond previous limits.
  • To investigate high-k electron density fluctuations across a wide spatial range within the plasma.

Main Methods:

  • Utilizing an 8-channel, 693 GHz poloidal FIR scattering system.
  • Employing large aperture optics for radiation collection at 8 simultaneous scattering angles (2° to 15°).
  • Implementing steerable launch optics and remotely translatable receiver optics (5 axes) to control the scattering volume location and orientation.

Main Results:

  • The new system replaces a 5-channel, 280 GHz toroidal system.
  • Reduced wavelength in the poloidal system minimizes refraction effects.
  • Measurement of poloidal wavenumbers is extended from 7 cm-1 to over 40 cm-1.
  • The scattering volume can be positioned from r/a = 0.1 to the pedestal region (r/a ∼ 0.99).

Conclusions:

  • The developed poloidal FIR scattering system significantly enhances the study of high-k electron density fluctuations on NSTX-U.
  • The extended wavenumber and spatial coverage provide unprecedented insights into plasma turbulence.
  • This advancement is crucial for improving confinement and achieving sustained fusion reactions.