<i>H</i> mode observed in the JFT-2M tokamak with edge heating by electron cyclotron waves

K. Hoshino; T. Yamamoto; H. Kawashima; N. Suzuki; Y. Uesugi; M. Mori; H. Aikawa; S. Kasai; T. Kawakami; T. Matsuda; Y. Miura; K. Odajima; H. Ogawa; T. Ogawa; H. Ohtsuka; T. Shoji; H. Tamai; T. Yamauchi; T. Kondo; I. Nakazawa; C. R. Neufeld; H. Maeda

doi:10.1103/PhysRevLett.63.770

H mode observed in the JFT-2M tokamak with edge heating by electron cyclotron waves

K. Hoshino, T. Yamamoto, H. Kawashima, N. Suzuki, Y. Uesugi, M. Mori, H. Aikawa, S. Kasai, T. Kawakami, T. Matsuda, Y. Miura, K. Odajima, H. Ogawa, T. Ogawa, H. Ohtsuka, T. Shoji, H. Tamai, T. Yamauchi, T. Kondo, I. Nakazawa, C. R. Neufeld, and H. Maeda

Phys. Rev. Lett. 63, 770 – Published 14 August 1989

Abstract

The H mode is observed by the edge heating of a tokamak plasma solely by the electron cyclotron heating with the wave cutoff region in the plasma core. Threshold power for the H-mode transition can be as low as 120 kW, which is the lowest threshold power observed in spite of the peripheral power deposition. These experimental results show clearly that the H mode can be produced without additional heating of the plasma core, and provide direct confirmation that the H-mode mechanism is closely related to an increase in the plasma edge electron temperature.