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Confinement degradation with beta for ELMy $$H$$-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 $textit{H}$-mode confinement database and the dedicated experiment on a single $$beta_mathrm{T}$$ scan while $$rho_mathrm{T}^ast$$ and $$nu^ast$$ 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 $$beta_mathrm{T}^{0.3-0.4} B_mathrm{T}$$.

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Category:Physics, Fluids & Plasmas

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