Investigations of H-mode plasmas triggered directly by pellet injection in the DIII-D tokamak.
The transition from low-confinement (L-mode) to high-confinement (H-mode) plasmas has been directly produced by injecting frozen deuterium pellets in the DIII-D tokamak. H-mode transitions were produced at edge electron and ion temperatures below the L-mode values. This implies that a critical edge temperature is not necessary for H-mode transitions. The experimentally determined edge plasma parameters were well below those predicted by several theories of the H-mode transition to trigger the H-mode, indicating a need for revision of these theories.
Gohil
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General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.
Baylor
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Jernigan
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Burrell
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Carlstrom
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