Three-dimensional modelling and numerical optimisation of the W7-X ICRH antenna

被引：3

作者：

Louche, F. ^{[1
]}

Krivska, A. ^{[1
]}

Messiaen, A. ^{[1
]}

Ongena, J. ^{[1
]}

Borsuk, V. ^{[2
]}

Durodie, F. ^{[1
]}

Schweer, B. ^{[1
]}

机构：

[1] Ecole Royale Mil, Koninklijke Mil Sch, Lab Phys Plasmas ERM, Lab Plasmafys KMS LPP ERM KMS, Brussels, Belgium

[2] Forschungszentrum Julich, Inst Energy & Climate Res Plasma Phys, D-52425 Julich, Germany

来源：

FUSION ENGINEERING AND DESIGN | 2015年 / 96-97卷

关键词：

Antennas; Capacitors; W7-X; ICRH; Simulations;

D O I：

10.1016/j.fusengdes.2015.01.039

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Ion Cyclotron Resonance Heating (ICRH) is a promising heating and wall conditioning method considered for the W7-X stellarator and a dedicated ICRH antenna has been designed. This antenna must perform several tasks in a long term physics programme: fast particles generation, heating at high densities, current drive and ICRH physics studies. Various minority heating scenarios are considered and two frequency bands will be used. In the present work a design for the low frequency range (25-38 MHz) only is developed. The antenna is made of 2 straps with tap feeds and tuning capacitors with DC capacitance in the range 15-200 pF. These capacitors introduce additional constraints on the optimisation and on the maximum amount of power that can be coupled to the plasma: not only the capacitor voltages cannot exceed a certain value (42 kV) but also the currents are limited to approximately 740 A rms to ensure sufficient heat dissipation for the considered duty cycle. Starting from an initial geometry we used the tridimensional electromagnetic software CST MicroWave Studio (MWS) to assess and optimise its coupling properties. By modifying some geometrical parameters of the front face (strap width, antenna box depth, strap length, strap feeders shape), we show that a substantial increase in maximum coupled power can be obtained accounting for the technical constraints on the capacitors. The various steps of the optimisation are validated with TOPICA simulations. For a given density profile the RF power coupling expectancy can be precisely computed. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：508 / 511

页数：4

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