Unveiling the structure and dynamics of peeling mode in quiescent high-confinement tokamak plasmas
Unveiling the structure and dynamics of peeling mode in quiescent high-confinement tokamak plasmas
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揭示静态高约束托卡马克等离子体剥离模式的结构和动力学
DOI：
10.1038/s42005-021-00644-x
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发表时间：
2021
影响因子：
5.5
通讯作者：
Isayama Akihiko
中科院分区：
文献类型：
--
作者：
Kamiya Kensaku;Itoh Kimitaka;Aiba Nobuyuki;Oyama Naoyuki;Honda Mitsuru;Isayama Akihiko
具有边缘谐波振荡的静止高约束模等离子体不表现出与边缘局域模相关的爆炸不稳定性。相反，被认为是一个额外的手段，增强运输保持等离子体边缘的剥离模式不稳定的边界下的条件。虽然剥离模式的潜力已被广泛认可的等离子体物理，没有直接的证据，这种模式已经揭示了以前，因为缺乏决定性的诊断。在这里，我们报告的结构和动态稳定状态的剥离模式在静态高限制模式的证据。边缘谐波振荡在低场和高场侧均由基模主导。边缘扰动被证实有扭结宇称，并表现出冻结的线性稳定性分析预测的条件。基本模式的包络信号表现出与边缘梯度的微小变化相关联的增长和阻尼的重复循环。研究结果与极限环振荡模型定量一致。
Quiescent high-confinement mode plasmas with edge-harmonic oscillations do not exhibit the explosive instabilities associated with edge-localized modes. Instead, an additional means of enhanced transport is considered to maintain the plasma edge under conditions just below the boundary of the peeling mode instability. Although the potential of the peeling mode has been widely recognized in plasma physics, no direct evidence for this mode has been revealed previously because decisive diagnostics were lacking. Herein, we report evidence of the structure and dynamical steady state of peeling mode in quiescent high-confinement mode. Edge-harmonic oscillations are dominated by fundamental mode at both the low- and high-field sides. Edge perturbations are confirmed to have kink parity and exhibit the frozen-in-condition predicted by linear stability analysis. The envelope signal of the fundamental mode exhibits repeated cycles of growth and damping in association with minor changes in the edge gradient. Results from this study are quantitatively consistent with limit-cycle-oscillation model.
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影响因子：
2.2
作者：
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作者：
Xi Chen;K. Burrell;T. Osborne;K. Barada;N. Ferraro;A. Garofalo;R. Groebner;G. McKee;C. Petty;M. Porkolab;T. Rhodes;J. Rost;P. Snyder;W. Solomon;Zheng Yan
通讯作者：
Zheng Yan
影响因子：
3.3
作者：
Shimada, M.;Campbell, D. J.;Sipps, A. C. C.
通讯作者：
Sipps, A. C. C.
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影响因子：
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作者：
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D. V. Vugt
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影响因子：
2.2
作者：
Itoh Kimitaka;Kamiya Kensaku;Aiba Nobuyuki;Itoh Sanae-I
通讯作者：
Itoh Sanae-I