Experimental evaluation of avalanche type of electron heat transport in magnetic confinement plasmas

oleh: F. Kin, K. Itoh, T. Bando, K. Shinohara, N. Oyama, M. Yoshida, K. Kamiya, S. Sumida

Format: Article
Diterbitkan: IOP Publishing 2022-01-01

Deskripsi

Turbulent transport is undoubtedly important in magnetic confinement plasmas. It has been reported that a lot of transport dynamics are not satisfying the local diffusive models. Here, we report the quantitative measurement of electron heat flux associated with ballistic propagating long-range transport events, which is considered to be a component of avalanches. In addition, we show the first observations of the substantial impact of avalanche-driven transport on profile resilience (or profile stiffness) observed in JT-60U. We found that, in the channel of the electron heat flux, the ratio between the increment of the avalanche-driven component to that of the total plasma heating becomes dominant (∼80%) in the case of the high-heating limit. This suggests a possible role for avalanche-driven transport to induce profile resilience, which has been evidenced by flux-driven simulations.