Confinement degradation with beta for ELMy -mode plasmas in JT-60U tokamak

Urano, Hajime; Takizuka, Tomonori; Takenaga, Hidenobu; Oyama, Naoyuki; Miura, Yukitoshi; Kamada, Yutaka

The degradation of energy confinement with increased toroidal beta $beta_mathrm{T}$ was shown by the non-dimensional analysis in JT-60U. The dependence of the energy confinement on $beta_mathrm{T}$ was examined by both the JT-60U ELMy -mode confinement database and the dedicated experiment on a single $beta_mathrm{T}$ scan while $rho_mathrm{T}^ast$ and were kept fixed as well as the other magnetic geometrical parameters. In both cases, the degradation of energy confinement with increasing $beta_mathrm{T}$ was observed, satisfying the relation of $B_mathrm{T} tau_mathrm{E} propto beta_mathrm{T}^{-(0.6-0.7)}$ . This dependence is a little weaker than that predicted by the IPB98(y,2) scaling. The fusion power production rate was estimated to increase in proportion to $beta_mathrm{T}^{0.3-0.4} B_mathrm{T}$ .

Language	:	English
Journal	:	Nuclear Fusion
Volume	:	46
Number	:	8
Pages	:	p.781 - 787
Publication Year/Month	:	2006/08
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Paper URL	:	https://doi.org/10.1088/0029-5515/46/8/003
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Keywords	:	Beta; Energy confinement; Non-dimensional Analysis; Degradation; ELMy H-mode; JT-60U
Research Facility	:	JT-60(臨界プラズマ試験装置)
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InCites™	:	Percentile:58.85 Category:Physics, Fluids & Plasmas
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Registration No. : A20050194
JAEA Abstracts No. : 34001204
Paper Submission No. : 1362

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