Production of Fast Electrons in the Beam-Plasma Interaction

Conrad, J.R.; Walsh, John E.; Diaz, C. J.; Freese, K.B.

doi:10.1103/physrevlett.30.827

Cited by 18 publications

(4 citation statements)

References 10 publications

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“…Accomplishments in understanding collisionless resistivity, the interaction between a plasma and a magnetic field (magnetic-field penetration), the beam-plasma interaction, parallel electric-field generation in a magnetic mirror geometry, and electric-charge double-layer formation were responsible for widely recognized highlights during this period of investigation. Noteworthy laboratory contributions include the discovery of a double sheath (layer) [14], a high-voltage parallel potential drop [15,16], an instability due to a perpendicular ion beam [17], and fast-electron production by an electrostatic beam-plasma wave [18].…”

Section: Geospace-lab Interrelationshipmentioning

confidence: 99%

Interrelationship between Lab, Space, Astrophysical, Magnetic Fusion, and Inertial Fusion Plasma Experiments

Koepke

2019

Atoms

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The objectives of this review are to articulate geospace, heliospheric, and astrophysical plasma physics issues that are addressable by laboratory experiments, to convey the wide range of laboratory experiments involved in this interdisciplinary alliance, and to illustrate how lab experiments on the centimeter or meter scale can develop, through the intermediary of a computer simulation, physically credible scaling of physical processes taking place in a distant part of the universe over enormous length scales. The space physics motivation of laboratory investigations and the scaling of laboratory plasma parameters to space plasma conditions, having expanded to magnetic fusion and inertial fusion experiments, are discussed. Examples demonstrating how laboratory experiments develop physical insight, validate or invalidate theoretical models, discover unexpected behavior, and establish observational signatures for the space community are presented. The various device configurations found in space-related laboratory investigations are outlined.

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Section: Geospace-lab Interrelationshipmentioning

confidence: 99%

Interrelationship between Lab, Space, Astrophysical, Magnetic Fusion, and Inertial Fusion Plasma Experiments

Koepke

2019

Atoms

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“…However, the NEP can glow stably at pressure-range of 10 −4 Torr and lower in the laboratory according to the measurements of the cold cathode gauge. Through complicated beam-plasma instabilities, and not the usual electron-neutral collisions, the power of the injected energetic electron beam is damped by the plasma and, in turn, replenishing the energetic Maxwellian-tail population (at energies well above the ionization potential) of the plasma electrons sustaining the plasma [11][12][13][14][15][16][17][18]. At this point, it is worth summarizing one of the features in electronbeam power damping through beam-plasma instabilities discussed extensively in the literature [23][24][25][35][36][37][38]: The EEDf of the electron-beam plasma has a general shape containing the Maxwellian bulk followed by a 'plateau on the tail' continuum extending far beyond the Maxwelliantail into the beam-electron group whose energy spectrum has been significantly broadened towards both sides of its peak that marks the energy of the injected energetic electron beam.…”

Section: Nep Heating Mechanismmentioning

confidence: 99%

End-boundary sheath potential, electron and ion energy distribution in the low-pressure non-ambipolar electron plasma

Chen

Funk

2013

Plasma Sources Sci. Technol.

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The end-boundary floating-surface sheath potential, electron and ion energy distribution functions (EEDf , IEDf ) in the low-pressure non-ambipolar electron plasma (NEP) are investigated. The NEP is heated by an electron beam extracted from an inductively coupled electron-source plasma (ICP) through a dielectric injector by an accelerator located inside the NEP. This plasma's EEDf has a Maxwellian bulk followed by a broad energy continuum connecting to the most energetic group with energies around the beam energy. The NEP pressure is 1-3 mTorr of N 2 and the ICP pressure is 5-15 mTorr of Ar. The accelerator is biased positively from 80 to 600 V and the ICP power range is 200-300 W. The NEP EEDf and IEDf are determined using a retarding field energy analyser. The EEDf and IEDf are measured at various NEP pressures, ICP pressures and powers as a function of accelerator voltage. The accelerator current and sheath potential are also measured. The IEDf reveals mono-energetic ions with adjustable energy and it is proportionally controlled by the sheath potential. The NEP end-boundary floating surface is bombarded by a mono-energetic, space-charge-neutral plasma beam. When the injected energetic electron beam is adequately damped by the NEP, the sheath potential is linearly controlled at almost a 1 : 1 ratio by the accelerator voltage. If the NEP parameters cannot damp the electron beam sufficiently, leaving an excess amount of electron-beam power deposited on the floating surface, the sheath potential will collapse and become unresponsive to the accelerator voltage.

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“…3 It consists of a beam-formed hydrogen plasma with density between 10 9 and 10 10 cm" 3 , beam energy between 500 and 1500 V, and beam currents between 1 and 20 mA. A strong axial magnetic field (-3400 G) renders the electron motion effectively one dimensional.…”

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confidence: 99%

“…A still further decrease in beam voltage will lead to the excitation of a broad spectrum and the formation of a high-energy tail. 3 The spectrum shown in Fig. 1 modes located at 20 and 40 MHz is shown in Fig.…”

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confidence: 99%

Time Dependence of Electron Scattering in a Beam-Plasma System

1974

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Production of Fast Electrons in the Beam-Plasma Interaction

Abstract: We have observed the generation of high-energy electrons by longitudinal electrostatic waves in a beam-plasma system. We find a direct correlation between the measured field and particle spectra.

Cited by 18 publications

References 10 publications

Interrelationship between Lab, Space, Astrophysical, Magnetic Fusion, and Inertial Fusion Plasma Experiments

Interrelationship between Lab, Space, Astrophysical, Magnetic Fusion, and Inertial Fusion Plasma Experiments

End-boundary sheath potential, electron and ion energy distribution in the low-pressure non-ambipolar electron plasma

Time Dependence of Electron Scattering in a Beam-Plasma System

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