Journal ArticleDOI
ICRH antenna coupling physics and optimum plasma edge density profile. Application to ITER
A Messiaen,R Weynants +1 more
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In this article, the performance of an ICRH system depends on the coupling capabilities of the antenna to the inhomogeneous plasma profile in front of it, and the authors analyzed the key physics phenomena contributing to the coupling.Abstract:
The performance of an ICRH system depends on the coupling capabilities of the antenna to the inhomogeneous plasma profile in front of it. The aim of this study is to understand the key physics phenomena contributing to the coupling. It is shown that the following plasma density profile characteristics are decisive: (i) distance between the antenna and the wave cutoff density, (ii) position of an optimum density with respect to the cutoff one and (iii) the density gradient leading from this optimum density to the plasma bulk. At each step of the analysis approximate relations are derived and the loading due to the plasma is compared with that of an isotropic dielectric medium in view of the application for modelling or dummy load testing. Examples are taken starting from the case of the projected ITER antenna array with its different phasing cases in front of the plasma edge profile used in the conceptual design phase. It is shown that, for the same antenna–cutoff distance, slight profile modifications can lead to substantial coupling and therefore power capability variations. Stronger profile modifications and some critically shaped resonant edge profiles are also analysed. The usefulness of a dielectric medium to simulate plasma loading is discussed in an appendix.read more
Citations
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Journal ArticleDOI
On resonant ICRF absorption in three-ion component plasmas: a new promising tool for fast ion generation
TL;DR: In this article, a very efficient ion-cyclotron-resonance-frequency (ICRF) absorption scheme was proposed, which relies on the presence of three ion species residing in the plasma.
Journal ArticleDOI
Study and design of the ion cyclotron resonance heating system for the stellarator Wendelstein 7-X
J. Ongena,A. M. Messiaen,D. Van Eester,B. Schweer,Pierre Dumortier,F. Durodié,Yevgen O. Kazakov,Fabrice Louche,M. Vervier,R. Koch,A. Krivska,A.I. Lyssoivan,M. Van Schoor,Tom Wauters,V. Borsuk,Olaf Neubauer,Oliver Schmitz,G. Offermans,Y. Altenburg,C. Baylard,D. Birus,S. A. Bozhenkov,D. A. Hartmann,J P Kallmeyer,S. Renard,R. C. Wolf,Tünde Fülöp +26 more
TL;DR: In this paper, the current status of the mechanical and electromagnetic design for the ICRF antenna system for W7-X is presented, and 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 another consisting of two short strap triplets to cover a frequency band around 76 MHz.
Journal ArticleDOI
2D and 3D modeling of wave propagation in cold magnetized plasma near the Tore Supra ICRH antenna relying on the perfecly matched layer technique
J. Jacquot,L. Colas,F. Clairet,M. Goniche,Stéphane Heuraux,Julien Hillairet,Gilles Lombard,Daniele Milanesio +7 more
TL;DR: In this article, a novel method to simulate ion cyclotron wave coupling in the edge of a tokamak plasma with the finite element technique is presented, which is applied in the commercial software COMSOL Multiphysics.
Journal ArticleDOI
Conceptual study of an ICRH traveling-wave antenna system for low-coupling conditions as expected in DEMO
TL;DR: In this article, the authors used traveling-wave antennas (TWAs) distributed all along the reactor wall between the blanket modules and mounted and fed in resonant ring system(s).
Journal ArticleDOI
Progress on ion cyclotron range of frequencies heating physics and technology in support of the International Tokamak Experimental Reactor
James R. Wilson,Paul Bonoli +1 more
TL;DR: The status of ICRF preparations for ITER and supporting research were updated in the 2007 [Gormezano et al., Nucl. Fusion 47, S285 (2007)] report on the ITER physics basis as discussed by the authors.
References
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Book
Foundations for microwave engineering
TL;DR: This paper presents a meta-modelling architecture for waveguiding systems that automates the very labor-intensive and therefore time-heavy and expensive process of designing and installingWaveguiding Systems.
Journal ArticleDOI
Heating in Toroidal Plasmas (Report on the 4th International Symposium, Rome, 21–28 March, 1984)
H. Knoepfel,G. Mazzitelli +1 more
TL;DR: The fourth International Symposium of the Varenna-Grenoble series, held in Rome from March 21 to 28, 1984, was organized by the Italian Commission for Nuclear and Alternative Energy Sources (ENEA) and the International School of Plasma Physics (Varenna) as mentioned in this paper.
Journal ArticleDOI
Performance of the ITER ICRH system as expected from TOPICA and ANTITER II modelling
A.M. Messiaen,R. Koch,R.R. Weynants,Pierre Dumortier,Fabrice Louche,Riccardo Maggiora,Daniele Milanesio +6 more
TL;DR: In this paper, the performance of the antennas of the proposed ITER ICRF system is evaluated by means of the antenna 24 × 24 impedance matrix provided by the TOPICA code and confirmed and interpreted by the semi-analytical code ANTITER II (summarized in an appendix).
Journal ArticleDOI
Preparing ITER ICRF: development and analysis of the load resilient matching systems based on antenna mock-up measurements
A. Messiaen,M. Vervier,Pierre Dumortier,Djamel Grine,P. U. Lamalle,F. Durodié,R. Koch,Fabrice Louche,R.R. Weynants +8 more
TL;DR: It is verified by modelling that this matching scenario has the same antenna spectrum and load resilience performances as the antenna array loaded by plasma as described by the TOPICA simulation.
Journal ArticleDOI
Influence of an evanescence layer in front of the antenna on the coupling efficiency of ion cyclotron waves
TL;DR: In this article, an elementary one-dimensional model was proposed to demonstrate that the dependence on the coupling of an evanescent layer in front of ion cyclotron fast-wave antennas is too pessimistic.
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