Cyclotron spatial autoresonance acceleration model

Dugar-Zhabon, V. D.; Orozco, E. A.

doi:10.1103/physrevstab.12.041301

Cited by 11 publications

(3 citation statements)

References 11 publications

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“…One may enhance the cyclotron resonance acceleration by applying a time-varying magnetic field 24,25 or a stationary inhomogeneous magnetic field. [26][27][28][29] In Ref. 26, the electron cyclotron resonance acceleration by an intense plane-wave laser pulse has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of electron energy during vacuum laser acceleration in an inhomogeneous magnetic field

Saberi

Maraghechi

2015

Physics of Plasmas

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In this paper, the effect of a stationary inhomogeneous magnetic field on the electron acceleration by a high intensity Gaussian laser pulse is investigated. A focused TEM (0,0) laser mode with linear polarization in the transverse x-direction that propagates along the z-axis is considered. The magnetic field is assumed to be stationary in time, but varies longitudinally in space. A linear spatial profile for the magnetic field is adopted. In other words, the axial magnetic field increases linearly in the zdirection up to an optimum point z m and then becomes constant with magnitude equal to that at z m . Three-dimensional single-particle simulations are performed to find the energy and trajectory of the electron. The electron rotates around and stays near the z-axis. It is shown that with a proper choice of the magnetic field parameters, the electron will be trapped at the focus of the laser pulse. Because of the cyclotron resonance, the electron receives enough energy from the laser fields to be accelerated to relativistic energies. Using numerical simulations, the criteria for optimum regime of the acceleration mechanism is found. With the optimized parameters, an electron initially at rest located at the origin achieves final energy of c ¼ 802. The dynamics of a distribution of off-axis electrons are also investigated in which shows that high energy electrons with small energy and spatial spread can be obtained. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Enhancement of electron energy during vacuum laser acceleration in an inhomogeneous magnetic field

Saberi

Maraghechi

2015

Physics of Plasmas

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“…Although the ring of high-energy electrons was observed in the first experiments on the ECR heating of mirror trap plasmas [12][13][14] and a collective philosophy to explain the discharge ring structure was developed [15], only recently it has been demonstrated how the ring is self-organized and that the ring is comprised of hot and superhot electrons [16]. An acceleration of electrons to super-high energies is attributed to the space cyclotron autoresonance phenomenon [17,18]. Elsewhere [4] it is shown that a direct contact of the ring with the plasma electrode that provokes the bombardment of the plasma electrode by energetic ring particles results in the forming of a near-electrode-surface layer of the secondary low-energy electrons.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of negative hydrogen ion production in an electron cyclotron resonance source

Dugar-Zhabon¹,

Murillo²,

Karyaka³

2013

Phys. Scr.

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In this paper, we present a method for improving the negative hydrogen ion yield in the electron cyclotron resonance source with driven plasma rings where the negative ion production is realized in two stages. First, the hydrogen and deuterium molecules are excited in collisions with plasma electrons to high-laying Rydberg and high vibration levels in the plasma volume. The second stage leads to negative ion production through the process of repulsive attachment of low-energy electrons by the excited molecules. The low-energy electrons originate due to a bombardment of the plasma electrode surface by ions of a driven ring and the thermoelectrons produced by a rare earth ceramic electrode, which is appropriately installed in the source chamber. The experimental and calculation data on the negative hydrogen ion generation rate demonstrate that very low-energy thermoelectrons significantly enhance the negative-ion generation rate that occurs in the layer adjacent to the plasma electrode surface. It is found that heating of the tungsten filaments placed in the source chamber improves the discharge stability and extends the pressure operation range.

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“…The hot electrons very likely gain their energies due to collective plasmawave interactions in the cyclotron and high-hybrid resonance conditions [6]. A mechanism of electron heating to energies of hundreds kilo-electron-volts is attributed to the space cyclotron autoresonance electron-microwaves interaction [7,8]. Recently this autoresonance interaction has helped to understand how electron rings, which are experimentally observed in the magnetic mirror traps [9][10][11], are self-organized [12].…”

Section: Introductionmentioning

confidence: 99%

Simulation of plasma confinement in an electron cyclotron resonance zero-B trap

Dugar-Zhabon¹,

Umnov²,

Murillo-Acevedo³

2015

Iteckne

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Resumen-Actualmente el estudio del comportamiento de plasmas en campos magnetostáticos asimétricos de configuración compleja solo es posible a través de simulación computacional. La eficiencia de confinamiento del plasma en una trampa cero-B, el cual es comprimido longitudinalmente por un espejo magnético y transversalmente por el campo de un hexapolo magnético, es determinada a través del método de partícula en celda electrostático. En el modelo simulado el plasma es calentado por microondas de 14 GH cuya potencia es transmitida a los electrones mediante resonancia ciclotrónica. La distribución espacial de la componete iónica y electrónica es mostrada. Se encuentra que la población electrónica puede ser dividida en tres grupos, fríos, calientes y super calientes. Los datos obtenidos para la distribución de la densidad tanto radial como longitudinal son comparados con las mismas distribuciones encontradas para la trampa mínimo-B. Como resultado se encuentra que la trampa cero-B presenta algunas ventajas frente a la trampa mínimo-B.Palabras clave-Trampa magnética, resonancia ciclotrónica electrónica, simulación mediante el método partícula en celda.Abstract-Currently the study of the nonlinear plasma evolution in magnetostatic fields of complex asymmetrical configurations is possible only through computer simulations. The confinement efficiency of plasma by a magnetic zero-B trap which is comprised of longitudinal mirror and transversal hexapole cusp fields is determined through a particle-in-cell method in the electrostatic approximation. In the simulation model the plasma heating by 14 GHz microwave power is realized at electron cyclotron resonance conditions. The space localizations of electron and ion components are visualized. It is found that the plasma electron population can be subdivides into cold, hot and superhot groups. The obtained data for the ion density distribution along radial and longitudinal trap directions are compared with the same distributions calculated for the case of minimum-B trap. It is found that the zero-B trap has some advantage over the minimum-B trap in reference to the Lawson criterion.

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Cyclotron spatial autoresonance acceleration model

Cited by 11 publications

References 11 publications

Enhancement of electron energy during vacuum laser acceleration in an inhomogeneous magnetic field

Enhancement of electron energy during vacuum laser acceleration in an inhomogeneous magnetic field

Enhancement of negative hydrogen ion production in an electron cyclotron resonance source

Simulation of plasma confinement in an electron cyclotron resonance zero-B trap

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