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Upgraded divertor Thomson scattering system on DIII-D.

F Glass1, T N Carlstrom1, D Du1

  • 1General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.

The Review of Scientific Instruments
|December 3, 2016
PubMed
Summary

A new design enhances the DIII-D divertor Thomson scattering system for electron temperature and density measurements in high triangularity plasmas. This upgrade provides crucial data for understanding plasma behavior in challenging fusion environments.

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Area of Science:

  • Fusion energy research
  • Plasma physics
  • Diagnostic instrumentation

Background:

  • The DIII-D tokamak utilizes a divertor Thomson scattering system for plasma diagnostics.
  • High triangularity plasmas present challenges for existing diagnostic access.
  • Accurate electron temperature (Te) and density (ne) measurements are vital for fusion plasma control.

Purpose of the Study:

  • To present a design for extending the DIII-D divertor Thomson scattering system.
  • To enable measurements of Te and ne in high triangularity plasma regions.
  • To maintain existing divertor measurement capabilities.

Main Methods:

  • A movable, in-vacuum mirror redirects the Nd:YAG laser beam to access inboard regions.
  • Scattered light is collected by high-temperature, in-vacuum optical elements.
  • Existing polychromators and data acquisition systems are utilized for analysis.

Main Results:

  • The design allows selectable measurements in high triangularity plasmas.
  • The system maintains the capability to measure Te (0.5 eV–2 keV) and ne (5 × 10^18–1 × 10^21 m^-3).
  • Measurements are feasible for both low Te in detachment and high Te conditions.

Conclusions:

  • The enhanced divertor Thomson scattering system design is presented.
  • The upgrade facilitates crucial plasma measurements in challenging DIII-D operating regimes.
  • This advancement supports improved understanding and control of fusion plasmas.