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Abstract:

A variety of Pierce diodes formed by a pair of grounded concentric spheres with electrons streaming radially are investigated with particle-in-cell simulations and analytical models. The electrons flow parallel or antiparallel to a density gradient in convergent or divergent diodes, respectively. The existence and stability (or instability) of laminar steady states with space charge and nonuniform velocity that are possible for a given set of diode parameters, are crucial to determine the outcome of the numerical experiments. The dispersion relation for the stability of the initial constant velocity states and the concomitant energy flow balance are examined in relation to the nonlinear dynamical evolution. Spherical diodes have properties that are common to a dual pair of diodes with reciprocal ratios of collector to emitter radii. Stable oscillatory electrostatic states, associated with Hopf bifurcations, are observed in the simulations. The breakdown of the laminar electron flow has completely different physical characteristics in divergent and convergent diodes. © 2000 American Institute of Physics.

Registro:

Documento: Artículo
Título:Nonlinear dynamics of electron flows with density gradient in spherical diodes
Autor:Alves, M.V.; Gnavi, G.; Gratton, F.T.; Ferro, S.; Moreno, C.H.
Filiación:Inst. Nac. de Pesquisas Espaciais, P.O. Box 515, Sao José dos Campos 12201-970, Brazil
Inst. de Física del Plasma, CONICET, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Año:2000
Volumen:7
Número:7
Página de inicio:2798
Página de fin:2809
DOI: http://dx.doi.org/10.1063/1.874130
Título revista:Physics of Plasmas
Título revista abreviado:Phys Plasmas
ISSN:1070664X
CODEN:PHPAE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1070664X_v7_n7_p2798_Alves

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Citas:

---------- APA ----------
Alves, M.V., Gnavi, G., Gratton, F.T., Ferro, S. & Moreno, C.H. (2000) . Nonlinear dynamics of electron flows with density gradient in spherical diodes. Physics of Plasmas, 7(7), 2798-2809.
http://dx.doi.org/10.1063/1.874130
---------- CHICAGO ----------
Alves, M.V., Gnavi, G., Gratton, F.T., Ferro, S., Moreno, C.H. "Nonlinear dynamics of electron flows with density gradient in spherical diodes" . Physics of Plasmas 7, no. 7 (2000) : 2798-2809.
http://dx.doi.org/10.1063/1.874130
---------- MLA ----------
Alves, M.V., Gnavi, G., Gratton, F.T., Ferro, S., Moreno, C.H. "Nonlinear dynamics of electron flows with density gradient in spherical diodes" . Physics of Plasmas, vol. 7, no. 7, 2000, pp. 2798-2809.
http://dx.doi.org/10.1063/1.874130
---------- VANCOUVER ----------
Alves, M.V., Gnavi, G., Gratton, F.T., Ferro, S., Moreno, C.H. Nonlinear dynamics of electron flows with density gradient in spherical diodes. Phys Plasmas. 2000;7(7):2798-2809.
http://dx.doi.org/10.1063/1.874130