A method for density fluctuation measurements using pulse reflectometry

被引：4
|
作者：
Krutkin, O. [1 ]
Brunner, S. [1 ]
Coda, S. [1 ]
机构：
[1] Ecole Polytech Fed Lausanne EPFL, Swiss Plasma Ctr SPC, CH-1015 Lausanne, Switzerland
来源：
NUCLEAR FUSION | 2023年 / 63卷 / 07期
关键词：
reflectometry; turbulence; full-wave modelling; MICROWAVE REFLECTOMETRY; NONLINEAR-THEORY; LENGTH;
D O I：
10.1088/1741-4326/acd5e0
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：
An analytical 1D model based on the WKB approximation is used to study the properties of a short pulse reflectometry diagnostic in a magnetic fusion device. Expressions linking the pulse delay with the parameters of the turbulence near the cut-off layer are derived for both ordinary and extraordinary polarizations of the probing beam. These results are used to develop a method for measuring the turbulence amplitude and the radial correlation length. The analytical conclusions and the proposed method are validated using full-wave numerical modelling. The latter is also used to study the limitations of the method and potential experimental effects not included in the reduced model.
引用
收藏
页数：15
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