Mechanisms for generating toroidal rotation in tokamaks without external momentum input
Mechanisms for generating toroidal rotation in tokamaks without external momentum input
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DOI：
10.1063/1.3328521
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发表时间：
2010-03
影响因子：
2.2
通讯作者：
W. Solomon;K. Burrell;A. Garofalo;S. Kaye;R. Bell;A. Cole;J. Degrassie;P. Diamond;T. Hahm;G. Jackson;M. Lanctot;C. Petty;H. Reimerdes;S. Sabbagh;E. Strait;T. Tala;R. Waltz
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文献类型：
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作者：
W. Solomon;K. Burrell;A. Garofalo;S. Kaye;R. Bell;A. Cole;J. Degrassie;P. Diamond;T. Hahm;G. Jackson;M. Lanctot;C. Petty;H. Reimerdes;S. Sabbagh;E. Strait;T. Tala;R. Waltz
DIII-D的近期实验[J. L. Luxon，Nucl. Fusion 42，614（2002）]和国家球形环实验（NSTX）[M. Ono等人，Nucl. Fusion 40，557（2000）]已经集中于研究聚变等离子体中驱动旋转的机制。所谓的内禀旋转是由等离子体中的残余应力驱动的有效扭矩产生的，其似乎起源于等离子体边缘。观察到这种固有驱动与H模式压力梯度的明显缩放。再加上实验推断的角动量箍缩，这样的边缘源能够产生剪切旋转轮廓。内在驱动也可能直接在核心中，尽管物理机制要复杂得多。另一个正在探索的选择是使用非共振磁场来旋转等离子体。有利地发现，来自这些场的扭矩可以在低旋转下增强，这有助于使等离子体从静止旋转，并且提供对等离子体减慢的增加的阻力。
Recent experiments on DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] and National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 40, 557 (2000)] have focused on investigating mechanisms of driving rotation in fusion plasmas. The so-called intrinsic rotation is generated by an effective torque, driven by residual stresses in the plasma, which appears to originate in the plasma edge. A clear scaling of this intrinsic drive with the H-mode pressure gradient is observed. Coupled with the experimentally inferred pinch of angular momentum, such an edge source is capable of producing sheared rotation profiles. Intrinsic drive is also possible directly in the core, although the physics mechanisms are much more complex. Another option which is being explored is the use of nonresonant magnetic fields for spinning the plasma. It is found beneficially that the torque from these fields can be enhanced at low rotation, which assists in spinning the plasma from rest, and offers increased resistance against plasma slowing.