Role of electric field curvature in the formation of edge transport barrier in the JT-60U tokamak
Role of electric field curvature in the formation of edge transport barrier in the JT-60U tokamak
复制标题
电场曲率在 JT-60U 托卡马克边缘传输势垒形成中的作用
DOI：
10.1088/1361-6587/aa8a01
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发表时间：
2017
影响因子：
2.2
通讯作者：
Kobayashi T
中科院分区：
文献类型：
--
作者：
Kamiya K;Itoh K;Itoh S-I;Ida K;Kobayashi T
基于JT-60 U托卡马克径向电场（Er）的高分辨率光谱测量，我们确定了Er曲率对边缘输运势垒（ETB）形成的作用机制。此外，我们认识到一个新的作用的E r-剪切扩展的基座宽度，补偿不利的影响的E r-曲率有其符号依赖于湍流运输。我们发现了一个新的有趣的现象，非常缓慢的异相振荡之间的E-r和离子温度梯度在30-50 Hz的频率范围内，之前的慢LH过渡，这可以证明与非均匀性E-r效应的ETB形成的因果关系测试。还讨论了E r-分岔的一个临界条件。
Based on the high-resolution spectroscopic measurements of the radial electric field (E r) in the JT-60U tokamak, we have identified the mechanisms centered around the role of the E r-curvature on the edge transport barrier (ETB) formation. In addition, we recognized a new role of the E r-shear for the expansion of pedestal width, compensating an unfavorable effect of the E r-curvature having its sign dependence on the turbulence transport. We found a new interesting phenomenon of very slow out-of-phase oscillations between the E r and ion temperature gradient in the frequency range of 30–50 Hz, preceding the slow LH transition, which can demonstrate a causality test of the ETB formation in association with the non-uniformity E r-effects. A critical condition for the E r-bifurcations is also discussed.