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A 130 point Nd:YAG Thomson scattering diagnostic on MAST.

R Scannell1, M J Walsh, M R Dunstan

  • 1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom. rory.scannell@ccfe.ac.uk

The Review of Scientific Instruments
|November 2, 2010
PubMed
Summary

A new Thomson scattering diagnostic on MAST provides fast, flexible measurements of plasma physics. This advanced system enables rapid data availability, supporting real-time operational potential.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Diagnostic instrumentation

Background:

  • The Mega Ampere Spherical Tokamak (MAST) requires advanced diagnostics for studying plasma behavior.
  • Understanding edge and core plasma physics is crucial for fusion energy development.

Purpose of the Study:

  • To implement a Thomson scattering diagnostic system on MAST.
  • To enable flexible, high-speed measurements of plasma properties.
  • To facilitate rapid data acquisition for real-time analysis.

Main Methods:

  • Utilized eight Nd:YAG lasers with adjustable repetition rates for burst measurements.
  • Employed a large-aperture, multi-element lens system (F/6, 290 mm aperture) for light collection.
  • Transferred scattered light via 130 fiber bundles to 130 polychromators.

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  • Implemented a distributed data acquisition system with 26 chassis, each processing data for five polychromators.

    • Main Results:

    • Successfully implemented a Thomson scattering diagnostic capable of measuring both edge and core plasma physics.
    • Achieved arbitrary relative and absolute timing of lasers for tailored measurement bursts.
    • Developed a data acquisition system providing quick data availability post-MAST shot.
    • Demonstrated potential for real-time data operations.

    Conclusions:

    • The new Thomson scattering diagnostic enhances MAST's capability to study plasma physics.
    • The system's flexibility and speed support detailed investigations of time-evolving plasma phenomena.
    • The rapid data processing paves the way for future real-time control applications in fusion devices.