Plasma flow asymmetries in the natural helical divertor of an l =3 torsatron and their relation to particle losses
Plasma flow asymmetries in the natural helical divertor of an l =3 torsatron and their relation to particle losses
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l=3 扭转管自然螺旋偏滤器中的等离子体流不对称性及其与粒子损失的关系
DOI：
10.1088/0029-5515/42/2/311
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发表时间：
2002
期刊：
影响因子：
3.3
通讯作者：
K. Yamazaki
中科院分区：
文献类型：
--
作者：
V. Chechkin;L. I. Grigor’eva;M. Smirnova;E. L. Sorokovoj;E. Volkov;V. Rudakov;K. S. Rubtsov;N. Nazarov;A. V. Lozin;S. A. Tsybenko;A. Litvinov;A. S. Slavnyj;I. Adamov;A. Kulaga;Yu. K. Mironov;V. D. Kotsubanov;I. K. Nikolskij;T. Mizuuchi;S. Masuzaki;T. Morisaki;N. Ohyabu;K. Yamazaki
在l = 3/m = 9 Uragan-3M （U-3M）转流器（R0 = 1m，¯a≈0.12 m, Bφ = 0.72 T, ι（¯a）/2π≈0.4）中实现了开螺旋转流器。利用射频场（ω≈ωci）加热产生了¯ne≈2 × 10 18 m−3，Te≈0.3 keV, Ti≈0.1 keV的氢等离子体。用78个平面朗缪尔探针在环形体的两个几何对称的极向横截面的螺旋线圈之间的间距中呈多向排列，检测了转移等离子体的流动。在测量双极性（如离子饱和电流Is）和非双极性（如到接地探针的电流Ip）等离子体流的分布时，观察到这些分布在垂直方向上有很强的不对称性，其主要特征是在环面上部和下部流出流的Is值有许多倍的差异，而这些流的Ip值则相反。与正电流对应的较大的双极流的转移等离子体。环向磁场方向的逆转导致了不对称性的逆转，较大的通量（和Ip >）总是流向离子B ×∇B漂移方向。在此基础上，得出不对称性与约束体积中带电粒子的直接（非扩散）损失有关。这一结论通过U-3M中热粒子和快速粒子轨道的数值模拟得到了验证，其中计算出的丢失粒子的角坐标分布与测量到的转移等离子体流动的极向分布在定性上一致。
In the l = 3/m = 9 Uragan-3M (U-3M) torsatron (R0 = 1m , ¯ a ≈ 0.12 m, Bφ = 0.72 T, ι(¯ a)/2π ≈ 0.4), an open helical divertor is realized. A hydrogen plasma with ¯ ne ≈ 2 × 10 18 m −3 , Te ≈ 0.3 keV, Ti ≈ 0.1 keV is produced and heated by RF fields (ω ≈ ωci). The flows of diverted plasma are detected by 78 plane Langmuir probes aligned poloidally in the spacings between the helical coils in two geometrically symmetric poloidal cross-sections of the torus. In measurements of the distributions of ambipolar (e.g. the ion saturation current Is) and non-ambipolar (e.g. the current to a grounded probe Ip) plasma flows, a strong vertical asymmetry of these distributions is observed, its main characteristics being a many-fold difference in the values of Is in the outgoing flows in the upper and lower parts of the torus and the opposite signs of Ip in these flows, with the positive current corresponding to the larger ambipolar flow of the diverted plasma. Reversal of the direction of the toroidal magnetic field results in the reversal of the asymmetry, with the larger flux (and Ip > 0) always flowing in the ion B × ∇B drift direction. On this basis, it is concluded that the asymmetry is related to direct (non-diffusive) losses of charged particles from the confinement volume. This conclusion is validated by numerical modelling of thermal and fast particle orbits in U-3M, where qualitative agreement has been revealed between the calculated distribution of the angular co-ordinates of lost particles and the measured poloidal distributions of the flows of diverted plasma.
磁结构和加热方法对 Heliotron E 中偏转等离子体分布的影响
DOI：
--
发表时间：
2007
期刊：
J.Nuclear Materials. Vol. 266-269
影响因子：
--
作者：
T.Mizuuchi
通讯作者：
T.Mizuuchi
Heliotron E 中的主偏滤器流：它们的分布以及对 NBI 和 ECH 的依赖性
DOI：
--
发表时间：
2000
期刊：
Nuclear Fusion 40
影响因子：
--
作者：
V.V.Chechkin
通讯作者：
V.V.Chechkin