Extension of the high-ion-temperature regime in the Large Helical Device

Authors :: M., Yokoyama
K., Nagaoka
M., Yoshinuma
Y., Takeiri
K., Ida
S., Morita
O., Kaneko
T., Seki
H., Kasahara
T., Mutoh
Y., Oka
K., Tsumori
M., Osakabe
K., Ikeda
K., Tanaka
H., Funaba
S., Matsuoka
S., Masuzaki
J., Miyazawa
R., Sakamoto
H., Yamada
K., Kawahata
N., Ohyabu
S., Imagawa
A., Komori
S., Sudo
O., Motojima
Experimental Group, LHD
Source :: Physics of Plasmas. 15:056111
Publication Year :: 2008
Publisher :: AIP Publishing, 2008.
Abstract: High-ion-temperature (exceeding 5 keV) hydrogen plasmas have been successfully produced in the Large Helical Device [Iiyoshi et al., Nucl. Fusion 39, 1245 (1999); Motojima et al., Nucl. Fusion 47, S668 (2007)] with the ion heat confinement improvement in the core region. The experimental ion heat diffusivity at the core region is found to be almost independent of the ion temperature, T_i (even decreasing as T_i increases). The neoclassical (NC) ripple transport is suppressed by the ambipolar radial electric field, E_r (

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