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

Y. Miura, F. Okano, N. Suzuki, M. Mori, K. Hoshino, H. Maeda, T. Takizuka, S. I. Itoh, K. Itoh

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Abstract

Rapid changes of the main ion energy distribution at transitions from L to H, H to L, and during edge localized modes (ELMs) are studied with the time-of-flight neutral measurement on the JFT-2M tokamak. At the L to H transition, 200400 s prior to the start of the H 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 *i<1 just inside the separatrix. A change of the energy distribution preceding that of the H signal is also found for ELMs.

Original languageEnglish
Pages (from-to)2216-2219
Number of pages4
JournalPhysical Review Letters
Volume69
Issue number15
DOIs
Publication statusPublished - Jan 1 1992

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Miura, Y., Okano, F., Suzuki, N., Mori, M., Hoshino, K., Maeda, H., Takizuka, T., Itoh, S. I., & Itoh, K. (1992). Rapid change of the neutral hydrogen energy distribution at the L/H transition in the JFT-2M tokamak. Physical Review Letters, 69(15), 2216-2219. https://doi.org/10.1103/PhysRevLett.69.2216