Experimental identification of the kink instability as a poloidal flux amplification mechanism for coaxial gun spheromak formation
Experimental identification of the kink instability as a poloidal flux amplification mechanism for coaxial gun spheromak formation
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DOI：
10.1103/physrevlett.90.215002
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发表时间：
2003-05-30
影响因子：
8.6
通讯作者：
Bellan, PM
中科院分区：
文献类型：
--
作者：
Hsu, SC;Bellan, PM
磁流体动力学扭折不稳定性被观测到，并被实验确定为同轴枪球马克形成的极向通量放大机制。在这个实验中的等离子体分为三个不同的制度，这取决于峰值枪电流的磁通量比，与（I）低的值导致在一个直的等离子体柱与螺旋磁场，（II）中间值导致扭曲的列轴，和（III）高值立即导致分离的等离子体。发病列扭结同意定量与Kruskal-Shafranov限制，和扭结作为发电机转换为极向磁通。制度II显然导致极向通量放大和spheromak配置的发展。
The magnetohydrodynamic kink instability is observed and identified experimentally as a poloidal flux amplification mechanism for coaxial gun spheromak formation. Plasmas in this experiment fall into three distinct regimes which depend on the peak gun current to magnetic flux ratio, with (I) low values resulting in a straight plasma column with helical magnetic field, (II) intermediate values leading to kinking of the column axis, and (III) high values leading immediately to a detached plasma. Onset of column kinking agrees quantitatively with the Kruskal-Shafranov limit, and the kink acts as a dynamo which converts toroidal to poloidal flux. Regime II clearly leads to both poloidal flux amplification and the development of a spheromak configuration.