Plasma potential and turbulence dynamics in toroidal devices (survey of T-10 and TJ-II experiments)
Plasma potential and turbulence dynamics in toroidal devices (survey of T-10 and TJ-II experiments)
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环形装置中的等离子体势和湍流动力学（T-10 和 TJ-II 实验调查）
DOI：
10.1088/0029-5515/51/8/083043
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发表时间：
2011
期刊：
影响因子：
3.3
通讯作者：
V. Vershkov
中科院分区：
文献类型：
--
作者：
A. Melnikov;C. Hidalgo;L. Eliseev;E. Ascasíbar;A. Chmyga;K. Dyabilin;I. Krasilnikov;V. Krupin;L. Krupnik;S. Khrebtov;A. Komarov;A. Kozachek;D. Lopez;S. Lysenko;V. A. Mavrin;J. D. de Pablos;I. Pastor;S. Perfilov;M. Pedrosa;R. Shurygin;V. Vershkov
直接比较的电势和它的波动在T-10托卡马克和TJ-II仿星器的两台机器中的类似的等离子体条件，使用重离子束探针诊断。我们观察到以下相似之处：（i）几百伏的等离子体电势，导致几十V cm−1的径向电场Er;（ii）中心线平均电子密度大于时等离子体电势的负号，即使使用不同的加热方法，两台机器的值也相当;（iii）随着电子密度ne或能量约束时间τE的增加，势向负方向演化;（iv）随着电子回旋共振加热和电子温度Te的相关增加，τE降低，等离子体电势沿正方向演化。我们一般发现，越负的势和Er值对应着越高的τE值。模拟结果表明，基本的新古典机制有助于显着的电势在核心的形成。宽带湍流被抑制在自发和偏置过渡到改进的限制制度，总是伴随着等离子体电位分布的特征变化。观察到各种类型的准相干势振荡，其中包括T-10中的测地声学模式和TJ-II中的Alfvén本征模式。
A direct comparison of the electric potential and its fluctuations in the T-10 tokamak and the TJ-II stellarator is presented for similar plasma conditions in the two machines, using the heavy ion beam probe diagnostic. We observed the following similarities: (i) plasma potentials of several hundred volts, resulting in a radial electric field Er of several tens of V cm−1; (ii) a negative sign for the plasma potential at central line-averaged electron densities larger than , with comparable values in both machines, even when using different heating methods; (iii) with increasing electron density ne or energy confinement time τE, the potential evolves in the negative direction; (iv) with electron cyclotron resonance heating and associated increase in the electron temperature Te, τE degrades and the plasma potential evolves in the positive direction. We generally find that the more negative potential and Er values correspond to higher values of τE. Modelling indicates that basic neoclassical mechanisms contribute significantly to the formation of the electric potential in the core. Broadband turbulence is suppressed at spontaneous and biased transitions to improved confinement regimes and is always accompanied by characteristic changes in plasma potential profiles. Various types of quasi-coherent potential oscillations are observed, among them geodesic acoustic modes in T-10 and Alfvén eigenmodes in TJ-II.
影响因子：
3.3
作者：
Fujisawa, A.;Ido, T.;Schoch, P. M.
通讯作者：
Schoch, P. M.