Scalings of energy confinement and density limit in stellarator/heliotron devices
Scalings of energy confinement and density limit in stellarator/heliotron devices
复制标题
仿星器/日光管装置中能量限制和密度限制的缩放
DOI：
10.1088/0029-5515/30/1/002
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发表时间：
1990
期刊：
影响因子：
3.3
通讯作者：
A. Iiyoshi
中科院分区：
文献类型：
--
作者：
Shigeru Sudo;Y. Takeiri;H. Zushi;F. Sano;K. Itoh;K. Kondo;A. Iiyoshi
本文介绍了在仿星器/日光加速器装置（Heliotron E，温德尔斯坦VII-A，L2，Heliotron DR）中，对由电子回旋加热和/或中性束注入加热的等离子体的能量约束的经验标度的研究。总能量约束时间的建议标度为：其中P是吸收功率（MW），n是线平均电子密度（1020 m−3），B是等离子体轴上的磁场强度（T），a是平均短半径（m），R是长半径（m）。建议在最佳条件下可获得的密度极限的经验标度为：螺旋系统的这些标度与托卡马克中的标度进行了比较。能量约束标度与托卡马克的L模标度具有相似的功率依赖性。螺旋系统的密度极限标度似乎表明了与许多托卡马克类似的可实现密度的上限。从能量约束时间和密度极限，可以导出β极限，其可以低于稳定性/平衡β极限。因此，从设计机器的角度来看，应该小心选择B、a和R的值，因为约束时间（或nτET）和上述β极限对这些值的依赖性是不同的。
The paper presents a study of empirical scaling of energy confinement observed experimentally in stellarator/heliotron devices (Heliotron E, Wendelstein VII-A, L2, Heliotron DR) for plasmas heated by electron cyclotron heating and/or neutral beam injection. The proposed scaling of the gross energy confinement time is: , where P is the absorbed power (MW), n is the line average electron density (1020 m−3), B is the magnetic field strength on the plasma axis (T), a is the average minor radius (m) and R is the major radius (m). The empirical scaling of the density limit obtainable under the optimum condition is proposed to be: . These scalings for helical systems are compared with those in tokamaks. The energy confinement scaling has a similar power dependence as the L-mode scaling of tokamaks. The density limit scaling for helical systems seems to indicate an upper limit of the achievable density similar to that in many tokamaks. From the energy confinement time and the density limit , a beta limit can be derived: , which can be lower than the stability/equilibrium beta limit. Thus, from the viewpoint of designing a machine, the values of B, a and R should be selected with care because the dependence of the confinement time (or nτET) and of the above beta limit on these values is different.
影响因子：
3.3
作者：
A. Gibson;T. Sekiguchi;K. Lackner;S. Bodner;R. Hancox
通讯作者：
A. Gibson;T. Sekiguchi;K. Lackner;S. Bodner;R. Hancox
影响因子：
3.3
作者：
M. Murakami;J. D. Callen;L. Berry
通讯作者：
M. Murakami;J. D. Callen;L. Berry