Effect of toroidal field ripple on plasma rotation in JET

被引：50

作者：

de Vries, P. C. ^{[1
]}

Salmi, A. ^{[2
]}

Parail, V. ^{[1
]}

Giroud, C. ^{[1
]}

Andrew, Y. ^{[1
]}

Biewer, T. M. ^{[3
]}

Crombe, K. ^{[4
]}

Jenkins, I. ^{[1
]}

Johnson, T. ^{[5
]}

Kiptily, V. ^{[1
]}

Loarte, A. ^{[6
]}

Lonnroth, J. ^{[2
]}

Meigs, A. ^{[1
]}

Oyama, N.

Sartori, R. ^{[6
]}

Saibene, G. ^{[6
]}

Urano, H. ^{[7
]}

Zastrow, K. -D. ^{[1
]}

机构：

[1] UKAEA Euratom Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[2] Helsinki Univ Technol, Assoc Euratom Tekes, Helsinki 02015, Finland

[3] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[4] Univ Ghent, Dept Appl Phys, B-9000 Ghent, Belgium

[5] Assoc EURATOM VR, Fusion Plasma Phys, EES, KTH, Stockholm, Sweden

[6] MPI Plasmaphys, EFDA Close Support Unit, D-85748 Garching, Germany

[7] Japan Atom Energy Agcy, Naka, Ibaraki 3110193, Japan

来源：

NUCLEAR FUSION | 2008年 / 48卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1088/0029-5515/48/3/035007

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Dedicated experiments on TF ripple effects on the performance of tokamak plasmas have been carried out at JET. The TF ripple was found to have a profound effect on the plasma rotation. The central Mach number, M, defined as the ratio of the rotation velocity and the thermal velocity, was found to drop as a function of TF ripple amplitude (3) from an average value of M = 0.40-0.55 for operations at the standard JET ripple of 6 = 0.08% to M = 0.25-0.40 for 6 = 0.5% and M = 0.1-0.3 for delta = 1%. TF ripple effects should be considered when estimating the plasma rotation in ITER. With standard co-current injection of neutral beam injection (NBI), plasmas were found to rotate in the co-current direction. However, for higher TF ripple amplitudes (delta similar to 1%) an area of counter rotation developed at the edge of the plasma, while the core kept its co-rotation. The edge counter rotation was found to depend, besides on the TF ripple amplitude, on the edge temperature. The observed reduction of toroidal plasma rotation with increasing TF ripple could partly be explained by TF ripple induced losses of energetic ions, injected by NBI. However, the calculated torque due to these losses was insufficient to explain the observed counter rotation and its scaling with edge parameters. It is suggested that additional TF ripple induced losses of thermal ions contribute to this effect.

引用

页数：6

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