Performance and stability of near-unity aspect ratio plasmas in the Pegasus Toroidal Experiment
Performance and stability of near-unity aspect ratio plasmas in the Pegasus Toroidal Experiment
复制标题
飞马环形实验中近乎一致纵横比等离子体的性能和稳定性
DOI：
10.1063/1.1559972
复制
发表时间：
2003
影响因子：
2.2
通讯作者：
E. Unterberg
中科院分区：
文献类型：
--
作者：
G. Garstka;S. Diem;R. Fonck;B. Lewicki;A. Sontag;K. Tritz;E. Unterberg
飞马环形实验 [R. Fonck 等人，Bull。是。物理。苏克。 41, 1400 (1996)] 是一个球形环面，设计用于研究当纵横比 A 接近统一时等离子体行为的极限。通过使用新型高应力强化螺线管磁铁，可以获得接近统一的 A。通过在密度高达格林沃尔德极限的低场下运行，可以在欧姆加热等离子体中获得高环形 β βt。已获得高达 20% 的 βt 值和高达 5 的标准化 beta 值。等离子体电流与环形场棒电流的比率（称为环形场利用率）达到了大至 1 的值，但在该水平上似乎接近与欧姆通量限制和电阻磁流体动力学 (MHD) 活动的开始相关的“软”边界。 m/n=2/1 和 3/2 模式是最常观察到的，与推断的安全系数曲线一致。实验开始在边缘安全系数 q95=5 处访问外部扭结稳定性边界，这非常重要......
The Pegasus Toroidal Experiment [R. Fonck et al., Bull. Am. Phys. Soc. 41, 1400 (1996)] is a spherical torus designed to study the limits of plasma behavior as the aspect ratio A approaches unity. Access to near-unity A is achieved through the use of a novel high-stress reinforced solenoid magnet. High toroidal beta βt is obtained in ohmically-heated plasmas by operation at low field with densities up to the Greenwald limit. Values of βt up to 20% and normalized beta up to 5 have been obtained. The ratio of plasma current to toroidal field rod current, known as the toroidal field utilization, reaches values as large as 1 but appears to approach a “soft” boundary at that level related to both ohmic flux limitations and the onset of resistive magnetohydrodynamic (MHD) activity. The m/n=2/1 and 3/2 modes are most frequently observed, in agreement with the inferred safety factor profiles. Experiments are beginning to access the external kink stability boundary at edge safety factor q95=5, which is significant...