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Related Experiment Videos

H-Mode operation in the START spherical tokamak

Sykes1, Akers, Appel

  • 1EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom.

Physical Review Letters
|October 4, 2000
PubMed
Summary
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High-current spherical tokamak plasmas achieved H-mode operation, demonstrating improved energy confinement. This breakthrough signifies enhanced performance in spherical tokamak research.

Area of Science:

  • Plasma physics
  • Fusion energy research
  • Tokamak engineering

Background:

  • The spherical tokamak (ST) offers a compact, high-field alternative for fusion energy.
  • Achieving high-performance plasma regimes like H-mode is crucial for ST development.
  • Previous ST experiments faced challenges in reaching H-mode parameters.

Purpose of the Study:

  • To demonstrate and characterize H-mode operation in the START spherical tokamak.
  • To investigate the plasma physics associated with H-mode transitions in STs.
  • To assess the impact of H-mode on energy confinement time in high-current ST plasmas.

Main Methods:

  • Utilizing the START spherical tokamak with plasma currents exceeding 200 kA.
  • Employing both neutral beam injection heating and Ohmic heating methods.

Related Experiment Videos

  • Analyzing plasma profiles to identify edge pedestals, transport barriers, and edge-localized modes.

    • Main Results:

    • Successful achievement of H-mode operation in high-current (I(p)>200 kA) plasmas.
    • Observation of distinct edge density and temperature pedestals, indicative of edge-transport barriers.
    • Correlation of H-mode features with increased energy confinement time at plasma currents >250 kA.

    Conclusions:

    • This study provides the first clear demonstration of the H-mode regime in a spherical tokamak.
    • The results validate the potential of STs for achieving enhanced plasma performance.
    • Further research into ST H-mode physics can guide future fusion reactor designs.