Alfven eigenmode experiments in tokamaks and stellarators
Alfven eigenmode experiments in tokamaks and stellarators
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DOI：
10.1088/0741-3335/39/12b/022
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发表时间：
1997-12
影响因子：
2.2
通讯作者：
A. Fasoli;D. Borba;C. Gormezano;R. Heeter;A. Jaun;J. Jacquinot;W. Kerner;Q. King;J. Lister;S. Sharapov;D. Start;L. Villard
中科院分区：
文献类型：
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作者：
A. Fasoli;D. Borba;C. Gormezano;R. Heeter;A. Jaun;J. Jacquinot;W. Kerner;Q. King;J. Lister;S. Sharapov;D. Start;L. Villard
在托卡马克和仿星器中，在存在共振粒子驱动（包括聚变产生的α）的情况下测量电磁波动，揭示了阿尔芬本征模（AE）的激发，在某些条件下与快粒子约束的退化有关。驱动器和背景阻尼之间的平衡进行了研究，使用主动诊断系统激发和测量AE频谱的频率和阻尼率。在JET，鞍形线圈天线驱动低环形模式数（n 1%）在创建的磁性X点。在共振快粒子的存在下，获得了关于不稳定驱动的信息：低n模被发现在具有upplanar（parallel to）/upplanar（A）P-thresh的NBI存在下是稳定的，其中2.5 MW < P-thresh < 5 MW;在这些条件下，在磁涨落谱中清楚地观察到本征驱动的TAE和EAE，对等离子体性能没有可测量的影响。
In tokamaks and stellarators, measurements of electromagnetic fluctuations in the presence of resonant particle drive, including fusion-produced alpha's, reveal the excitation of Alfven eigenmodes (AE), related under certain conditions to a degradation in the fast-particle confinement. The balance between the drive and the background damping is investigated using active diagnostic systems to excite and measure the AE spectrum in terms of frequencies and damping rates. At JET, saddle-coil antennae drive low toroidal mode number (n 1%) during the creation of the magnetic X-point. In the presence of resonant fast particles, information on the instability drive is obtained: low-n modes are found to be stable in the presence of NBI with upsilon(parallel to)/upsilon(A) P-thresh, with 2.5 MW < P-thresh < 5 MW; under these conditions, intrinsically driven TAE and EAE are clearly observed in the magnetic fluctuation spectra, with no measurable effect on the plasma performance.