Beam-plasma discharge and the boundary effects

Kang, Min; Seon, Kwang‐Il

doi:10.1016/0032-0633(94)90140-6

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…It is well known in collisionless beam-plasma instability that any increase in the electron-neutral collision frequency, i.e. an increase in pressure, will reduce the damping of the electron-beam power [19,20]. This is consistent with the observation at 3 mTorr, as shown in figures 2(b) and (c) where the end-boundary sheath collapses at V A > 250 V (i.e.…”

Section: Sheath Potential Dependence On Electron-beam Power Dampingsupporting

confidence: 89%

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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Section: Sheath Potential Dependence On Electron-beam Power Dampingsupporting

confidence: 89%

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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“…Studies of discharges in gas, which were initiated by electron beams with a VC, were carried out experimentally and theoretically for different purposes: for collective acceleration of ions, [17][18][19][20] for atmospheric probing at the electron beam injection from rockets, [21][22][23][24] for manufacturing technologies, [25][26][27][28][29] for vacuum measurement, [30] etc.…”

Section: Introductionmentioning

confidence: 99%

Particle‐in‐cell/Monte Carlo‐simulation of the discharge in helium initiated by a relativistic electron beam in the chamber with a magnetic mirror

Дубинов

Тараканов

2022

Contributions to Plasma Physics

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A gas discharge is simulated and numerically studied in the gaseous helium in the region of the squeezed state of a single tubular magnetized relativistic electron beam at its partial reflection from a magnetic mirror. The code based on the particle-in-cell/Monte Carlo method was used. The electron beam dynamics, time evolution of phase portraits of particles, physical parameters, and spatial-time characteristics of plasma were calculated. It is shown that dense plasma appears in the cavity under the action of an electron beam in the form of a thin-walled long cylinder of a large length; its electron concentration can be several units of 10 11 cm −3 . At the same time, it turned out that plasma is considerably inhomogeneous in length; its more dense part corresponds to the part of the squeezed state of a beam. The time dependence of the charge compensation of electrons on the helium atom concentration in the chamber was calculated. The dependence turned out to be decreasing since the rate of discharge development is increasing with the growth of the helium pressure in the cavity.

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Effect of electron collisions on the plasma–sheath formation

Kang

et al. 2003

Surface and Coatings Technology

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Beam-plasma discharge and the boundary effects

Cited by 5 publications

References 11 publications

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

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

Particle‐in‐cell/Monte Carlo‐simulation of the discharge in helium initiated by a relativistic electron beam in the chamber with a magnetic mirror

Effect of electron collisions on the plasma–sheath formation

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