TOPLHA: an accurate and efficient numerical tool for analysis and design of LH antennas

Milanesio, Daniele; Meneghini, O.; Maggiora, Riccardo; Guadamuz, Saul; Hillairet, J.; Lancellotti, V.; Vecchi, G.

doi:10.1088/0029-5515/52/1/013008

Cited by 8 publications

(9 citation statements)

References 18 publications

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“…In Torino Politecnico Lower Hybrid Antenna (TOPLHA) [2], antennas are described with a 3D realistic meshed structure and the electromagnetic problem is formulated in terms of coupled integral equations. On the plasma side, TOPLHA incorporates the Finite Element Lower Hybrid Solver FELHS [3].…”

Section: Codes Descriptionmentioning

confidence: 99%

Benchmark of coupling codes (ALOHA, TOPLHA and GRILL3D) with ITER-relevant Lower Hybrid antenna

Milanesio

Hillairet

Panaccione

et al. 2011

Fusion Engineering and Design

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Section: Codes Descriptionmentioning

confidence: 99%

Benchmark of coupling codes (ALOHA, TOPLHA and GRILL3D) with ITER-relevant Lower Hybrid antenna

Milanesio

Hillairet

Panaccione

et al. 2011

Fusion Engineering and Design

Self Cite

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“…The lower-hybrid wave propagation code TORLH (Wright et al 2008) follows the same numerical method as the TORIC code. The coupling code TOPLHA (Milanesio et al 2012) uses the same tools as developed in the TOPICA code. To study the LHCD, a ray-tracing code coupled to a Fokker-Planck solver has been used, including the effect of density fluctuations, which can also be applied for studying electron cyclotron current drive ).…”

Section: Heating Simulationmentioning

confidence: 99%

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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“…A decade ago, antenna to plasma coupling modelling with commercial full-wave tools was not possible unless some severe simplifications, as they used to not support anisotropic and inhomogeneous dielectric media. Community codes such as OLGA [2] or ALOHA [3] and TOPLHA [4] for LHRF were developed specifically for that purpose. While these tools are generally faster than full-wave modelling since they solve part of the problem in the spectral domain, their Doppelgänger is to assume slab plasma and eventually simplified antenna geometries to keep an analytical formulation of the problem.…”

Section: Introductionmentioning

confidence: 99%

Lower hybrid range cold magnetized plasma coupling in ANSYS HFSS

Hillairet

Ragona

Colas

et al. 2019

Fusion Engineering and Design

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The coupling between cold magnetized plasmas with Lower Hybrid Resonance Frequency antennas is generally addressed using specifically developed codes. These antenna coupling codes often approximate the plasma to a surface impedance described by a 1D half infinite models and antennas either with simplified 2D dimensions or from 3D CAD models conversion. Such approaches add an additional step of model approximation/conversion which is not convenient to rapidly assess impact of geometry changes on coupling performances. In this work, we assess the ability of using ANSYS HFSS to describe the usual range of experimental magnetized cold plasma inhomogeneous parameters facing LHRF antennas, away from resonances, in order to guide the RF designer during the design phase of an antenna. The coupling calculations of Lower Hybrid Resonance Frequency antennas are performed and successfully benchmarked with the fast coupling codes ALOHA on inhomogeneous cold magnetized plasmas. Good agreements are obtained when the boundary conditions in the full-wave modelling are properly handled. Practical advices and limitations are given in order to define correctly these boundary conditions and insure correct results.

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TOPLHA: an accurate and efficient numerical tool for analysis and design of LH antennas

Cited by 8 publications

References 18 publications

Benchmark of coupling codes (ALOHA, TOPLHA and GRILL3D) with ITER-relevant Lower Hybrid antenna

Benchmark of coupling codes (ALOHA, TOPLHA and GRILL3D) with ITER-relevant Lower Hybrid antenna

Simulation as a tool to improve wave heating in fusion plasmas

Lower hybrid range cold magnetized plasma coupling in ANSYS HFSS

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