Plasma termination by excess pellet fueling and impurity injection in TJ-II, the Large Helical Device and Wendelstein 7-X
Plasma termination by excess pellet fueling and impurity injection in TJ-II, the Large Helical Device and Wendelstein 7-X
复制标题
通过在 TJ-II、大型螺旋装置和 Wendelstein 7-X 中添加过量颗粒燃料和注入杂质来终止等离子体
DOI：
10.1088/1741-4326/ab17fd
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发表时间：
2019
期刊：
影响因子：
3.3
通讯作者：
Rahbarnia K.
中科院分区：
文献类型：
--
作者：
Dinklage A.;McCarthy K.J.;Suzuki C.;Tamura N.;Wegner Th.;Yamada H.;Baldzuhn J.;Brunner K.J.;Buttenschoen B.;Damm H.;Drewelow P.;Fuchert G.;Hirsch M.;Hoefel U.;Kasahara H.;Knauer J.;Maier D.;Miyazawa J.;Motojima G.;Oishi T.;Rahbarnia K.
在大型螺旋装置温德尔斯坦7-X和TJ-II中研究了由于过量芯块燃料和杂质注入引起的等离子体终止事件。这些事件的时间尺度范围从典型能量约束时间的小数部分的值到能量约束时间的量级。能量损失的主要机制似乎是辐射，当接近辐射密度极限时，它揭示了与辐射坍塌的相似之处。与托卡马克类似，螺旋装置在真空中提供磁约束的能力（即没有大的感应等离子体电流），即使在一些能量约束时间后也能观察到等离子体恢复。时间尺度和动态恢复接近边际终止表明一些鲁棒性的螺旋设备的响应大的意外扰动。
Plasma terminating events due to excess pellet fueling and impurity injection is studied in the Large Helical Device, Wendelstein 7-X and TJ-II. Time scales for these events range from values of a decimal fraction of typical energy confinement times to the order of the energy confinement time. The leading mechanism of energy loss appears to be radiation revealing similarities to radiation collapses when a radiative density limit is approached. Differently to tokamaks, the capability of helical devices to provide magnetic confinement in vacuum (ie without large inductive plasma currents) gives rise to the observation of plasma recovery even after some energy confinement times. Time-scales and the dynamics of recovery for close to marginal termination indicates some robustness in the response of helical devices to large unintended perturbations.