Rapid change of the neutral hydrogen energy distribution at the L / H transition in the JFT-2M tokamak

Journal Article · Mon Oct 12 00:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.2216· OSTI ID:6970960

Miura, Y; Okano, F; Suzuki, N; Mori, M; Hoshino, K; Maeda, H; Takizuka, T ^[1]; Itoh, S; Itoh, K ^[2]

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1. Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-11 (Japan)
2. National Institute for Fusion Science, Nagoya 464-01 (Japan)

Rapid changes of the main ion energy distribution at transitions from {ital L} to {ital H}, {ital H} to {ital L}, and during edge localized modes (ELMs) are studied with the time-of-flight neutral measurement on the JFT-2M tokamak. At the {ital L} to {ital H} transition, 200--400 {mu}s prior to the start of the H{sub {alpha}} drop, an increase of the high-energy outflux above an energy of 200 eV is observed. An energy of more than 200 eV for hydrogen corresponds to the collisionless condition {nu}{sub *{ital i}}{lt}1 just inside the separatrix. A change of the energy distribution preceding that of the H{sub {alpha}} signal is also found for ELMs.

• OSTI ID: 6970960
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:15; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
AUGMENTATION
CHARGED PARTICLES
CLOSED PLASMA DEVICES
COLLISIONLESS PLASMA
DATA
DIVERTORS
ELECTRON TEMPERATURE
ELEMENTS
ENERGY SPECTRA
EXPERIMENTAL DATA
HEAT FLUX
HYDROGEN
INFORMATION
INHIBITION
IONS
JFT-2M TOKAMAK
NONMETALS
NUMERICAL DATA
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
SIGNALS
SPECTRA
THERMONUCLEAR DEVICES
TIME DEPENDENCE
TIME-OF-FLIGHT METHOD
TOKAMAK DEVICES