β-Limiting MHD instabilities in improved-performance NSTX spherical torus plasmas
β-Limiting MHD instabilities in improved-performance NSTX spherical torus plasmas
复制标题
改进性能 NSTX 球形环面等离子体中的 β 限制 MHD 不稳定性
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
the NSTX Team
中科院分区：
文献类型：
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作者：
J. Menard;Morag Bell;R. Bell;E. Fredrickson;D. Gates;S. Kaye;B. LeBlanc;R. Maingi;D. Mueller;S. Sabbagh;D. Stutman;C. Bush;D. Johnson;R. Kaita;H. Kugel;R. Maqueda;F. Paoletti;S. Paul;M. Ono;Y;C. Skinner;E. Synakowski;the NSTX Team
由于设备和操作的改进，国家球形环面实验(NSTX)中的全局磁流体力学(MHD)稳定性极限最近已显著提高。首先，更常规的H模式操作，加宽了压力分布，可以获得更高的归一化β和更低的内部电感。其次，对极向场线圈引起的误差场的修正在很大程度上消除了正常工作时的锁定撕裂模式，并提高了最大可实现的β。由于这些改进，峰值β已达到(而不是同时)βT=35%、βN=6.4、βN=4.5、βN/li=10和βP=1.4。高βP操作，撕裂活性降低，使放电脉冲长度翻了一番，仅略高于1 S，持续周期为βN≈6，高于理想的无墙限制，接近有壁限制。详细描述了各种运行状态下的β极限标度和β极限不稳定性。
Global magnetohydrodynamic (MHD) stability limits in the National Spherical Torus Experiment (NSTX) have increased significantly recently due to a combination of device and operational improvements. First, more routine H-mode operation with broadened pressure profiles allows access to higher normalized β and lower internal inductance. Second, the correction of a poloidal field coil induced error-field has largely eliminated locked tearing modes during normal operation and increased the maximum achievable β. As a result of these improvements, peak β values have reached (not simultaneously) βT = 35%, βN = 6.4, βN = 4.5, βN/li = 10, and βP = 1.4. High βP operation with reduced tearing activity has allowed a doubling of discharge pulse-length to just over 1 s with sustained periods of βN≈6 above the ideal no-wall limit and near the with-wall limit. Details of the β-limit scalings and β-limiting instabilities in various operating regimes are described.