A method for the estimate of the wall diffusion for non-axisymmetric fields using rotating external fields

被引：3
|
作者：
Frassinetti, L. [1 ]
Olofsson, K. E. J. [1 ,2 ]
Fridstrom, R. [1 ]
Setiadi, A. C. [1 ]
Brunsell, P. R. [1 ]
Volpe, F. A. [2 ]
Drake, J. [1 ]
机构：
[1] Royal Inst Technol KTH, Div Fus Plasma Phys, Assoc EURATOM VR, Sch Elect Engn, SE-10044 Stockholm, Sweden
[2] Columbia Univ, New York, NY 10027 USA
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2013年 / 55卷 / 08期
关键词：
FEEDBACK STABILIZATION; ACTIVE CONTROL; MODES; PINCH;
D O I：
10.1088/0741-3335/55/8/084001
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：
A new method for the estimate of the wall diffusion time of non-axisymmetric fields is developed. The method based on rotating external fields and on the measurement of the wall frequency response is developed and tested in EXTRAP T2R. The method allows the experimental estimate of the wall diffusion time for each Fourier harmonic and the estimate of the wall diffusion toroidal asymmetries. The method intrinsically considers the effects of three-dimensional structures and of the shell gaps. Far from the gaps, experimental results are in good agreement with the diffusion time estimated with a simple cylindrical model that assumes a homogeneous wall. The method is also applied with non-standard configurations of the coil array, in order to mimic tokamak-relevant settings with a partial wall coverage and active coils of large toroidal extent. The comparison with the full coverage results shows good agreement if the effects of the relevant sidebands are considered.
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页数：9
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