Study and design of the ion cyclotron resonance heating system for the stellarator Wendelstein 7-X
Artikel i vetenskaplig tidskrift, 2014

The current status of the mechanical and electromagnetic design for the ICRF antenna system for W7-X is presented. Two antenna plugins are discussed: one consisting of a pair of straps with pre-matching to cover the first frequency band, 25–38 MHz, and a second one consisting of two short strap triplets to cover a frequency band around 76 MHz. This paper focusses on the two strap antenna for the lower frequency band. Power coupling of the antenna to a reference plasma profile is studied with the help of the codes TOPICA and Microwave Studio that deliver the scattering matrix needed for the optimization of the geometric parameters of the straps and antenna box. Radiation power spectra for different phasings of the two straps are obtained using the code ANTITER II and different heating scenario are discussed. The potential for heating, fast particle generation, and current drive is discussed. The problem of RF coupling through the plasma edge and of edge power deposition is summarized. Important elements of the complete ion cyclotron resonance heating system are discussed: a resonator circuit with tap feed to limit the maximum voltage in the system, and a decoupler to counterbalance the large mutual coupling between the 2 straps. The mechanical design highlights the challenges encountered with this antenna: adaptation to a large variety of plasma configurations, the limited space within the port to accommodate the necessary matching components and the watercooling needed for long pulse operation.

Författare

J Ongena

Koninklijke Militaire School - Ecole Royale Militaire

A Messiaen

Koninklijke Militaire School - Ecole Royale Militaire

D Van Eester

Koninklijke Militaire School - Ecole Royale Militaire

B Schweer

Koninklijke Militaire School - Ecole Royale Militaire

P Dumortier

Koninklijke Militaire School - Ecole Royale Militaire

F Durodie

Koninklijke Militaire School - Ecole Royale Militaire

Yevgen Kazakov

Koninklijke Militaire School - Ecole Royale Militaire

F Louche

Koninklijke Militaire School - Ecole Royale Militaire

M Vervier

Koninklijke Militaire School - Ecole Royale Militaire

R Koch

Koninklijke Militaire School - Ecole Royale Militaire

A Krivska

Koninklijke Militaire School - Ecole Royale Militaire

A Lyssoivan

Koninklijke Militaire School - Ecole Royale Militaire

M Van Schoor

Koninklijke Militaire School - Ecole Royale Militaire

T Wauters

Koninklijke Militaire School - Ecole Royale Militaire

V Borsuk

Forschungszentrum Jülich

O Neubauer

Forschungszentrum Jülich

O Schmitz

Forschungszentrum Jülich

G Offermans

Forschungszentrum Jülich

Y Altenburg

Max Planck-institutet

C Baylard

Max Planck-institutet

D Birus

Max Planck-institutet

S Bozhenkov

Max Planck-institutet

D A Hartmann

Max Planck-institutet

J P Kallmeyer

Max Planck-institutet

S Renard

Max Planck-institutet

R C Wolf

Max Planck-institutet

Tünde Fülöp

Chalmers, Teknisk fysik, Nukleär teknik

Physics of Plasmas

1070-664X (ISSN) 1089-7674 (eISSN)

Vol. 21 061514- 061514

Drivkrafter

Hållbar utveckling

Styrkeområden

Energi

Fundament

Grundläggande vetenskaper

Ämneskategorier

Fusion, plasma och rymdfysik

DOI

10.1063/1.4884377