Unidirectional transparent signal injection in finite-difference time-domain electromagnetic codes –application to reflectometry simulations

Silva, F. da; Heuraux, S.; Hacquin, S.; Manso, M. E.

doi:10.1016/j.jcp.2004.09.002

Cited by 32 publications

(36 citation statements)

References 26 publications

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“…The REFMUL* family includes REFMUL, a 2D O-mode simulation code [8], REFMULX-/REFMULXp: 2D X-mode (serial/parallel) simulation codes [9] REFMUL3, presently in an advanced stage of development, is a 3D full-wave code. Its numerical kernel shares a similar structure to REFMULF but involves more equations to be solved, since all field components are included in a volume.…”

Section: The Refmul* Code Familymentioning

confidence: 99%

Modelling reflectometry diagnostics: finite-difference time-domain simulation of reflectometry in fusion plasmas

Silva¹,

Heuraux²,

Ricardo³

et al. 2019

J. Inst.

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A: Reflectometry simulations are particularly important since they allow to assess the measuring capabilities in experimental fusion devices and to predict the performance of future ones. We present a brief overview of reflectometry and introduce the family of REFMUL* codes for timedependent reflectometry simulation. REFMUL* codes are Finite Di erence Time Domain (FDTD) that allow to set up synthetic diagnostics to assess the behaviour of reflectometry diagnostics. This is illustrated in the current manuscript using the example of the Plasma Position Reflectometers of DEMO. K: Nuclear instruments and methods for hot plasma diagnostics; Simulation methods and programs; Plasma diagnostics -interferometry, spectroscopy and imaging

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Section: The Refmul* Code Familymentioning

confidence: 99%

Modelling reflectometry diagnostics: finite-difference time-domain simulation of reflectometry in fusion plasmas

Silva¹,

Heuraux²,

Ricardo³

et al. 2019

J. Inst.

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“…37,38 The code computes iteratively the probing electric field for a number of time steps large enough to ensure that the probing wave returns back to the receiving antenna. A transparent signal injection method 39 allowing for a direct discrimination of the reflected wave is used to launch a Gaussian beam with similar characteristics than in the Tore Supra experiments. These computations are repeated for all the successive maps of the density fluctuations so that the synthetic reflectometry signal can be reconstituted.…”

Section: D Effectsmentioning

confidence: 99%

Simulation of core turbulence measurement in Tore Supra ohmic regimes

Hacquin¹,

Citrin²,

Arnichand³

et al. 2016

Physics of Plasmas

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This paper reports on a simulation of reflectometry measurement in Tore Supra ohmic discharges, for which the experimental observations as well as gyrokinetic non-linear computations predict a modification of turbulence spectrum between the linear (LOC) and the saturated ohmic confinement (SOC) regimes. Synthetic reflectometry simulations coupling full-wave computations with gyrokinetic data are carried out. This allows a direct comparison between the gyrokinetic non-linear predictions and experimental observations. The synthetic diagnostic results are found in a good agreement with the experimental findings; in particular, they reproduce well the quasi-coherent peak in the fluctuation spectrum of LOC regimes dominated by a trapped electron mode turbulence. It is also shown that such synthetic tools are valuable for (i) an enhanced interpretation of the reflectometry measurement (for instance, through the investigation of the 2D effects) and (ii) a better understanding of the turbulence properties (for instance, via the analysis of its poloidal asymmetry).

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“…However, some caution has to be taken to avoid bi-directional emission (− − → k and + − → k at the same time). Having unidirectional emission of the launching wave is less simple to implement or requires sophisticated tools if one wants to introduce a transparent source (da Silva et al 2005;Taflove & Hagness 2000). To simulate an antenna in interaction with its surroundings, the source term should be as close as possible to the hardware components to simulate accurately the radiation wave pattern of the wave launcher.…”

Section: Numerical Tools Source Terms and Boundary Conditionsmentioning

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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Unidirectional transparent signal injection in finite-difference time-domain electromagnetic codes –application to reflectometry simulations

Cited by 32 publications

References 26 publications

Modelling reflectometry diagnostics: finite-difference time-domain simulation of reflectometry in fusion plasmas

Modelling reflectometry diagnostics: finite-difference time-domain simulation of reflectometry in fusion plasmas

Simulation of core turbulence measurement in Tore Supra ohmic regimes

Simulation as a tool to improve wave heating in fusion plasmas

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