Numerical modeling of the coupling of an ICRH antenna with a plasma with self-consistent antenna currents

Pécoul, S.; Heuraux, S.; Koch, R.; Leclert, G.

doi:10.1016/s0010-4655(02)00269-2

Cited by 35 publications

(30 citation statements)

References 20 publications

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“…In a variational formalism used in EVE code (Dumont & Zarzoso 2013) there is no possibility to model the antennaplasma coupling self-consistently, because at this moment the density current on the antenna is fixed and cannot be modified by the current induced on the antenna structure, which is limited to the straps description. To obtain relevant near-field computations, other ways are used to build antenna-plasma coupling codes, for example, Boundary Element Method in ICANT code, and integral method in TOPICA (see (Pécoul et al 2002;Lancellotti et al 2006)). Another one the TORIC code, using spectral decomposition, was also developed to study the ICRH scenarios (Brambilla 1999).…”

Section: Heating Simulationmentioning

confidence: 99%

“…The main ingredient to determine the RF potential along a magnetic field line E is generally computed from conventional antenna codes in the absence of sheaths, i.e., perfect electric conductors are assumed in direct contact with the plasma. This procedure, although clearly not self-consistent, was widely implemented as the only tool able to model realistic wave-launching structures (Pécoul et al 2002;Lancellotti et al 2006). The theoretical background of the SSWICH code that considers sheath boundary condition is in (Colas et al 2012).…”

Section: Contextmentioning

confidence: 99%

“…To obtain relevant near-field computations, other ways are used to build antenna–plasma coupling codes, for example, boundary element method in the ICANT code, and integral method in TOPICA (see Pécoul et al. 2002; Lancellotti et al. 2006).…”

Section: Wave Heating Simulations For Fusion Plasmasmentioning

confidence: 99%

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Simulation as a tool to improve wave heating in fusion plasmas

et al. 2015

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(Received ?; revised ?; accepted ?. -To be entered by editorial office)Firstly, a brief overview will be given on different models that are able to describe the behaviour of wave propagation as a function of specific frequency ranges. Each range corresponds to different heating systems, namely, 20-100 MHz for the Ion Cyclotron Resonant Heating (ICRH), 2-20 GHz for Lower Hybrid Heating or Current Drive (LHCD), and 100-250 GHz for Electron Cyclotron Resonant Heating (ERCH) or Current Drive (ECCD) systems. Every systems' specifications will be explained in detail, including the typical set of equations and the assumptions needed to describe the properties of these heating or current drive systems, as well as their specific domains of validity. In these descriptions, special attention will be paid to the boundary conditions. A review about specific physical problems associated with the wave heating systems will also be provided. Such review will detail the role of simulation in answering questions coming from experiments on magnetized plasma devices devoted to Fusion. A few examples which will be covered are the impact of edge turbulence on wave propagation and its consequences on the heating system performances, effects of the fast particles, ponderomotive effects, among others. A study that is more focused on Radio Frequency (RF) sheath effects will also be discussed. It shows that such simulations require very sophisticated tools to gain a partial understanding of the observations undertaken in dedicated experiments. To conclude this review, an overview will be given about the requirements and progress necessary to obtain relevant predictive simulation tools able to describe the wave heating systems used in fusion devices.

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Section: Heating Simulationmentioning

confidence: 99%

Section: Contextmentioning

confidence: 99%

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Simulation as a tool to improve wave heating in fusion plasmas

et al. 2015

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“…Ref. [1][2][3][4]) have been developed for calculation of the coupling to the plasma. However, antenna codes often use simplified plasma models, which do not always consider reflection of the wave.…”

Section: Introductionmentioning

confidence: 99%

On the coupling of waves for FWCD

Tholerus¹,

Hellsten²

2014

AIP Conference Proceedings

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Coupling of an ICRF antenna to fast magnetosonic waves in a toroidal plasma is studied, considering incomplete damping of waves and passive conducting elements, e.g. conducting limiters, near the antenna. The system is characterized by coupling to a broad spectrum of partially overlapping resonant modes, whose frequency widths are due to finite damping. Small variations of plasma parameters, in particular the plasma density, can change the coupling to individual modes significantly. Therefore, a statistical analysis of the coupling is required. Currents in passive conductors near the antenna, which are induced, in particular by resonant modes, redistribute the coupling to on-and off-resonant modes.A statistical analysis is made to study how coupling to a large set of modes varies with respect to continuous variation of plasma parameters. At low single pass damping it is found that the coupling spectrum can be significantly modified by passive conducting components. This affects the directivity of the launched spectrum, which is important for fast wave current drive (FWCD).

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“…Since then, there [2][3][4][5][6][7][8][9][10][11][12] have been a number of theoretical studies which have tried to remove various restrictions in the 3-D model mentioned above. In particular, the effects of including feeders [1,7,8] and the antenna configurations [10] have been discussed. In some of these studies [1][2][3][4] it has been pointed out that poloidal power spectrum and radiation pattern are asymmetric.…”

Section: Introductionmentioning

confidence: 99%

The Effect of a Poloidal Phase Difference on the Asymmetry of the Coupling Characteristics of an ICRH Antenna

Gong

et al. 2010

Contrib. Plasma Phys.

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The coupling asymmetry characteristics of an ion cyclotron resonance heating (ICRH) antenna consisting of two poloidal aligned straps are studied for a JET-type tokamak. The model used combines a three-dimensional (3-D) planar, cold-plasma, single pass antenna-plasma coupling code with any phase difference between the current straps, which takes into account the feeders' current and phase difference effects. The result shows that the asymmetry of radiated energy in poloidal direction can be controlled through changing the phase difference of the antenna straps, and when the phase difference equals to π, the asymmetry tends to become most pronounced.

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Numerical modeling of the coupling of an ICRH antenna with a plasma with self-consistent antenna currents

Cited by 35 publications

References 20 publications

Simulation as a tool to improve wave heating in fusion plasmas

Simulation as a tool to improve wave heating in fusion plasmas

On the coupling of waves for FWCD

The Effect of a Poloidal Phase Difference on the Asymmetry of the Coupling Characteristics of an ICRH Antenna

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