Kenmochi N, Ida K, Tokuzawa T, Yasuhara R, Funaba H, Uehara H, Den Hartog D J, Yamada I, Yoshinuma M, Takemura Y, Igami H
National Institute for Fusion Science, Toki, Gifu, 509-5292, Japan.
The Graduate University for Advanced Studies, SOKENDAI, Toki, Gifu, 509-5292, Japan.
Sci Rep. 2022 May 16;12(1):6979. doi: 10.1038/s41598-022-10499-z.
The preceding propagation of turbulence pulses has been observed for the first time in heat avalanche events during the collapse of the electron internal transport barrier (e-ITB) in the Large Helical Device. The turbulence and heat pulses are generated near the foot of the e-ITB and propagate to the peripheral region within a much shorter time than the diffusion timescale. The propagation speed of the turbulence pulse is approximately 10 km/s, which is faster than that of the heat pulse propagating at a speed of 1.5 km/s. The heat pulse propagates at approximately the same speed as that in the theoretical prediction, whereas the turbulence pulse propagates one order of magnitude faster than that in the prediction, thereby providing important insights into the physics of non-local transport.
在大型螺旋装置中电子内部输运垒（e-ITB）崩塌期间的热雪崩事件中，首次观测到了湍流脉冲的上述传播现象。湍流和热脉冲在e-ITB底部附近产生，并在比扩散时间尺度短得多的时间内传播到周边区域。湍流脉冲的传播速度约为10千米/秒，比以1.5千米/秒速度传播的热脉冲快。热脉冲的传播速度与理论预测值大致相同，而湍流脉冲的传播速度比预测值快一个数量级，从而为非局域输运的物理机制提供了重要见解。
