Lower Hybrid Waves
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Design and Synthesis of an Ultra Wide Band FSS for mm-Wave Application via General Regression Neural Network and Multiobjective Bat Algorithm
Abstract In this work is presented a hybrid bioinspired optimization technique that associates a General Regression Neural Network (GRNN) with the Multiobjective Bat Algorithm (MOBA), for the design and synthesis of the Frequency Selective Surfaces (FSS), aiming its application in data communication systems by diffusion of millimeter waves, specifically, in
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 11/11/2019
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2. Efficiency of LH+EC current drive in tokamaks featuring an internal transport barrier
In the present paper we study the effects due to the occurrence of radial transport of particles in a tokamak on the efficiency of current drive due to combined action of lower hybrid waves and electron cyclotron waves, in the presence of an internal transport barrier. The results are obtained by numerical solution of the Fokker-Planck equation which rules t
Brazilian Journal of Physics. Publicado em: 2005-09
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3. Electron cyclotron emission simulation from TCABR plasmas
Electron cyclotron emission due to electrons described by a particular distribution function has been studied. The latter presents an extended tail generated by the interaction of the Lower Hybrid wave with the plasma as compared to the Maxwellian distribution function. For this purpose a new code has been developed which calculates for an arbitrary distribu
Brazilian Journal of Physics. Publicado em: 2004-12
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4. Effect of radial transport on the LH current drive efficiency in tokamaks featuring an internal transport barrier
In the present paper we study the effects of occurrence of radial transport of particles in a tokamak, and the effects of the presence of an Internal Transport Barrier (ITB), on the current drive efficiency and power deposition profiles in the case of lower hybrid waves generating an extended tail in the electron distribution function. The results are obtain
Brazilian Journal of Physics. Publicado em: 2004-12
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5. Stochastic diffusion of energetic ions due to incoherent lower hybrid waves
In the present paper we discuss stochastic diffusion of energetic ions by a set of lower hybrid waves with frequencies close to each other and random phases which change along the time evolution of the system. We obtain efficient long term diffusion in velocity space, which is more representative of the diffusion produced by a continuous wave packet than the
Brazilian Journal of Physics. Publicado em: 2003-12
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6. Collisionless dissipation of radio-frequency waves in axisymmetric tokamak plasmas
Contributions of trapped and untrapped particles to the transverse and longitudinal dielectric permittivity elements are present for radio-frequency waves in a tokamak with circular cross-sections of the magnetic surfaces and arbitrary aspect ratio. Imaginary parts of the longitudinal permittivity elements are important to estimate the wave power absorbed by
Brazilian Journal of Physics. Publicado em: 2002-03
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7. Brecha espectral na geração de corrente por onda hibrida inferior
Current drive by lower hybrid wave LH, is the most promising technique to obtain continuos current for the controlled thermonuclear fusion. The existence of "Spectral gap" forbid satisfactory match between theoretical results and experimental measurements of the generated current. The theory has always predicted smaller values. In this Thesis we show a possi
Publicado em: 1997
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8. Interação da onda híbrida inferior com os íons rápidos no Tokamak JET / Interaction of Lower Hybrid Waves with Fast Ions in JET
As tentativas de se conseguir um funcionamento contínuo para o tokamak e as perspectivas de estabilização de oscilações MHD através do controle do perfil de corrente, motivaram pesquisas que levassem a uma forma de geração de corrente não indutiva. Uma das possíveis alternativas para atingir esta meta é a injeção de ondas de alta freqüência co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/06/1994