The beta scaling of energy confinement in ELMy H-modes in JET
The beta scaling of energy confinement in ELMy H-modes in JET
复制标题
JET 中 ELMy H 模式能量限制的 beta 缩放
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发表时间：
2004
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通讯作者：
J. Contributors
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作者：
D. McDonald;J. Cordey;C. Petty;M. Beurskens;R. Budny;I. Coffey;M. Baar;C. Giroud;E. Joffrin;P. Lomas;A. Meigs;J. Ongena;G. Saibene;R. Sartori;I. Voitsekhovitch;J. Contributors
在专用扫描中观察到的能量约束时间对归一化压力β的弱依赖性与用于下一步托卡马克和未来反应堆设计的约束标度律中的强负依赖性之间的不一致仍然是一个突出的问题。因此，β的扫描已经在单零，低三角形（δ ≥ 0.2）ELMy H模式等离子体在JET与MarkIIGB-SRP偏滤器进行。扫描使β变化2.8倍（标准化β从0.72到2.04），并涵盖磁场（1.5-2.3 T）、等离子体电流（1.5-2.75 MA）和安全系数（q95 = 2.8和3.3）的范围。在全局（任何一次扫描中B 0 τE的变化小于9%）和局部都观察到弱的β依赖性。I型ELMy H模式内的扫描表明，这种较弱的依赖性不是由于ELM制度。统计分析表明，这些结果是一致的对数线性回归上进行的广泛的JET数据库的ELMy H模式，如果在这个数据库中的相关性被认为是。
The disagreement between the weak dependence of the energy confinement time on normalized pressure, β, observed in dedicated scans and the strongly negative dependence in the confinement scaling laws used for the design of next step tokamaks and future reactors, remains an outstanding problem. As such, scans of β have been undertaken in single null, low triangularity (δ ≈ 0.2) ELMy H-mode plasmas in JET with the MarkIIGB-SRP divertor. The scans varied β by a factor of 2.8 (normalized β from 0.72 to 2.04) and covered a range of magnetic fields (1.5–2.3 T), plasma currents (1.5–2.75 MA) and safety factors (q95 = 2.8 and 3.3). A weak β dependence was observed both globally (B0τE varied less than 9% across any one scan) and locally. A scan within Type I ELMy H-modes suggests that this weaker dependence is not due to ELM regimes. A statistical analysis indicates that these results are consistent with log–linear regressions performed on a wide JET database of ELMy H-modes, if correlations in this database are considered.