Coupled full-wave and ray-tracing numerical treatment of mode conversion in a tokamak plasma

2000 ◽  
Vol 7 (3) ◽  
pp. 911-922 ◽  
Author(s):  
Yu. Petrov ◽  
A. Bécoulet ◽  
I. Monakhov
Keyword(s):  
Ray Tracing ◽  
Mode Conversion ◽  
Tokamak Plasma ◽  
Numerical Treatment ◽  
Full Wave

scholarly journals Numerical treatment of the spatio-temporal electromagnetic beam-wave packet

2017 ◽  
Vol 68 (2) ◽  
pp. 109-116
Author(s):  
L’ubomír Šumichrast ◽  
Jaroslav Franek
Keyword(s):  
Numerical Simulation ◽  
Wave Equation ◽  
Wave Packet ◽  
Paraxial Approximation ◽  
Two Dimensional ◽  
Numerical Treatment ◽  
Beam Wave ◽  
Electromagnetic Beam ◽  
Full Wave ◽  
Spatio Temporal

Abstract Propagation of a two-dimensional spatio-temporal electromagnetic beam wave is analysed. In parabolic (paraxial) approximation the exact analytical results for a spatio-temporal Gaussian impulse can be obtained. For solution of the full wave equation the numerical simulation has to be used. The various facets of this simulation are discussed here.

scholarly journals Skull’s Photoacoustic Attenuation and Dispersion Modeling with Deterministic Ray-Tracing: Towards Real-Time Aberration Correction

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 345 ◽  
Author(s):  
Leila Mohammadi ◽  
Hamid Behnam ◽  
Jahan Tavakkoli ◽  
Mohammad Avanaki
Keyword(s):  
Ray Tracing ◽  
Mode Conversion ◽  
Ex Vivo ◽  
Photoacoustic Imaging ◽  
Time Shift ◽  
Dispersion Modeling ◽  
Transmission Coefficients ◽  
Time Domain Signal ◽  
Wave Transmission Coefficients ◽  
Attenuation And Dispersion

Although transcranial photoacoustic imaging has been previously investigated by several groups, there are many unknowns about the distorting effects of the skull due to the impedance mismatch between the skull and underlying layers. The current computational methods based on finite-element modeling are slow, especially in the cases where fine grids are defined for a large 3-D volume. We develop a very fast modeling/simulation framework based on deterministic ray-tracing. The framework considers a multilayer model of the medium, taking into account the frequency-dependent attenuation and dispersion effects that occur in wave reflection, refraction, and mode conversion at the skull surface. The speed of the proposed framework is evaluated. We validate the accuracy of the framework using numerical phantoms and compare its results to k-Wave simulation results. Analytical validation is also performed based on the longitudinal and shear wave transmission coefficients. We then simulated, using our method, the major skull-distorting effects including amplitude attenuation, time-domain signal broadening, and time shift, and confirmed the findings by comparing them to several ex vivo experimental results. It is expected that the proposed method speeds up modeling and quantification of skull tissue and allows the development of transcranial photoacoustic brain imaging.

scholarly journals Heating by an Electron Bernstein Wave in a Spherical Tokamak Plasma via Mode Conversion

2006 ◽  
Vol 96 (18) ◽  
Author(s):  
S. Shiraiwa ◽  
K. Hanada ◽  
M. Hasegawa ◽  
H. Idei ◽  
H. Kasahara ◽  
...  
Keyword(s):  
Mode Conversion ◽  
Tokamak Plasma ◽  
Spherical Tokamak ◽  
Electron Bernstein Wave ◽  
Bernstein Wave

scholarly journals Full-wave modeling of the O-X mode conversion in the Pegasus Toroidal Experiment

2011 ◽  
Author(s):  
A. Köhn ◽  
J. Jacquot ◽  
M. W. Bongard ◽  
S. Gallian ◽  
E. T. Hinson ◽  
...  
Keyword(s):  
Mode Conversion ◽  
Wave Modeling ◽  
Full Wave

Full-wave characterization of the mode conversion in a coplanar waveguide right-angled bend

1995 ◽  
Vol 43 (11) ◽  
pp. 2532-2538 ◽  
Author(s):  
Ming-Dong Wu ◽  
Sheng-Ming Deng ◽  
Ruey-Beei Wu ◽  
Powen Hsu
Keyword(s):  
Mode Conversion ◽  
Coplanar Waveguide ◽  
Full Wave
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