Alfven eigenmode experiments in tokamaks and stellarators

被引：0

作者：

Fasoli, A. ^{[1
]}

Borba, D. ^{[1
]}

Gormezano, C. ^{[1
]}

Heeter, R. ^{[1
]}

Jaun, A. ^{[1
]}

Jacquinot, J. ^{[1
]}

Kerner, W. ^{[1
]}

King, Q. ^{[1
]}

Lister, J.B. ^{[1
]}

Sharapov, S. ^{[1
]}

Start, D. ^{[1
]}

Villard, L. ^{[1
]}

机构：

[1] Ass. Euratom-Swiss Confederation, Lausanne, Switzerland

来源：

Plasma Physics and Controlled Fusion | 1997年 / 39卷 / Suppl 12B期

关键词：

Alpha particles - Damping - Eigenvalues and eigenfunctions - Electromagnetic field measurement - Electromagnetic fields - Ions - Natural frequencies - Plasma confinement - Plasma stability - Plasmas;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

In tokamaks and stellarators, measurements of electromagnetic fluctuations in the presence of resonant particle drive, including fusion-produced α'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 υ/υA ICRH > Pthresh, with 2.5 MW 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.

引用

共 50 条

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Fasoli, A
Borba, D
Gormezano, C
Heeter, R
Jaun, A
Jacquinot, J
Kerner, W
King, Q
Lister, JB
Sharapov, S
Start, D
Villard, L
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