Effect of extinction beam-plasma discharge while the injection thermoelectrons during transportation of the electron beam in the forevacuum pressure range

Abstract The article presents the results of experiments aimed at studying the effect of low-energy thermoelectrons on the parameters of the beam plasma and plasma of the beam-plasma discharge generated during the transportation of a powerful electron beam in the pressure range of the medium vacuum. It is shown that the injection of a sufficiently small current of low-energy thermoelectrons is capable of violating the conditions for the combustion of the beam-plasma discharge and reducing the power loss of the electron beam for SPR generation. In this case, the plasma concentration decreases by almost an order of magnitude (to 1015 m–3) and the temperature of plasma electrons decreases by almost three (to 0.3 eV).

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Suppression by low-energy thermionic electrons of instabilities in the transport of a high-power electron beam in the forevacuum pressure range.

Plasma Sources Science and Technology ◽

10.1088/1361-6595/ac3969 ◽

2021 ◽

Author(s):

Aleksey Zenin ◽

Ilya Bakeev ◽

A. S. Klimov ◽

E M Oks

Keyword(s):

Electron Beam ◽

Electron Temperature ◽

High Power ◽

Pressure Range ◽

Plasma Discharge ◽

Plasma Electron ◽

Low Energy ◽

Plasma Cathode ◽

Beam Plasma ◽

Order Of Magnitude

Abstract We report here the results of our studies on the effect of injection of low-energy thermionic electrons on the suppression of instabilities of the beam-plasma discharge type in a beam-plasma during the transport of a powerful continuous electron beam generated by a plasma-cathode electron source in the forevacuum range of pressure. As result of thermionic electron injection, the plasma electron temperature decreased to 0.3 eV and the plasma density decreased by an order of magnitude to 10^15 m-3. The minimal thermoelectron current required for suppressing the beam-plasma discharge increases with increasing emission current and decreases with increase of the beam accelerating voltage.

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An experimental test-stand for investigation of electron-beam synthesis of dielectric coatings in medium vacuum pressure range

Vacuum ◽

10.1016/j.vacuum.2019.02.010 ◽

2019 ◽

Vol 163 ◽

pp. 31-36 ◽

Cited By ~ 4

Author(s):

A.V. Tyunkov ◽

V.A. Burdovitsin ◽

E.M. Oks ◽

Yu.G. Yushkov ◽

D.B. Zolotukhin

Keyword(s):

Electron Beam ◽

Experimental Test ◽

Pressure Range ◽

Test Stand ◽

Vacuum Pressure ◽

Dielectric Coatings ◽

Medium Vacuum

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Surface treatment by the ion flow from electron beam generated plasma in the forevacuum pressure range

MATEC Web of Conferences ◽

10.1051/matecconf/201814303008 ◽

2018 ◽

Vol 143 ◽

pp. 03008 ◽

Cited By ~ 1

Author(s):

Aleksandr Klimov ◽

Aleksey Zenin

Keyword(s):

Magnetic Field ◽

Electron Beam ◽

Pressure Range ◽

Alumina Ceramics ◽

Ion Energy ◽

Ion Flow ◽

Beam Plasma ◽

Flow Formation ◽

Beam Parameters ◽

Current Energy

The paper presents research results of peculiarities of gas ion flows usage and their generation from large plasma formation (>50 sq.cm) obtained by electron beam ionization of gas in the forevacuum pressure range. An upgraded source was used for electron beam generation, which allowed obtaining ribbon electron beam with no transmitting magnetic field. Absence of magnetic field in the area of ion flow formation enables to obtain directed ion flows without distorting their trajectories. In this case, independent control of current and ion energy is possible. The influence of electron beam parameters on the parameters of beam plasma and ion flow – current energy and density – was determined. The results of alumina ceramics treatment with a beam plasma ions flow are given.

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High Resolution Auger Depth Profiles Using a Dual Ion Gun System

MRS Proceedings ◽

10.1557/proc-54-699 ◽

1985 ◽

Vol 54 ◽

Cited By ~ 3

Author(s):

S. Ingrey ◽

J.P.D. Cook

Keyword(s):

Electron Beam ◽

Depth Profiling ◽

Depth Resolution ◽

Grazing Incidence ◽

Low Energy ◽

Multilayer Structures ◽

Dramatic Decrease ◽

Depth Profiles ◽

Order Of Magnitude ◽

Magnitude Improvement

A dual ion gun system has been proposed (D.E. Sykes et al, Appl. Surf. Sci. 5(1980)103) to reduce texturing and improve depth resolution during Auger sputter depth profiling. We have evaluated this ion gun configuration by profiling a variety of multilayer structures. With careful alignment of the guns, we have obtained a dramatic decrease in ion-induced texturing often seen when a single ion gun is used. This effect was particularly pronounced for polycrystalline Al films on Si where an order of magnitude improvement in depth resolution was achieved. Further refinements of the technique include the use of low energy (IkeV) grazing incidence xenon ions and a small electron beam probe area. Depth profiles obtained from Ni/Cr, W/Si, and GaAs/GaAlAs multilayer structures will also be discussed.

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On the influence of electron-beam metal evaporation on parameters of beam plasma in medium vacuum

Physics of Plasmas ◽

10.1063/1.5095165 ◽

2019 ◽

Vol 26 (5) ◽

pp. 053512 ◽

Cited By ~ 2

Author(s):

D. B. Zolotukhin ◽

V. A. Burdovitsin ◽

E. M. Oks ◽

A. V. Tyunkov ◽

Yu. G. Yushkov

Keyword(s):

Electron Beam ◽

Beam Plasma ◽

Metal Evaporation ◽

Medium Vacuum

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Electron beam-plasma discharge in GDT mirror trap: Particle-in-cell simulations

Nuclear Fusion ◽

10.1088/1741-4326/ac3cdc ◽

2021 ◽

Author(s):

Igor Timofeev ◽

Vladimir Annenkov ◽

Evgeniia Volchok ◽

Vladimir Glinskiy

Keyword(s):

Electron Beam ◽

Electric Fields ◽

Plasma Discharge ◽

Magnetized Plasma ◽

Beam Particle ◽

Nonuniform Plasma ◽

Particle In Cell ◽

Beam Plasma ◽

Transverse Electric Fields ◽

Recent Laboratory

Abstract The paper presents the results of numerical simulations of the collective relaxation of an electron beam in a magnetized plasma at the parameters typical to experiments on the ignition of a beam-plasma discharge in the Gas Dynamic Trap. The goal of these simulations is to confirm the ideas about the mechanism of the discharge development, which are used to interpret the results of recent laboratory experiments [Soldatkina et al 2021 {\it Nucl. Fusion}]. In particular, a characteristic feature of these experiments is the localization of the beam relaxation region in the vicinity of the entrance mirror. A strong mirror magnetic field compresses the beam so that its transverse size becomes less than the wavelength it excites. In addition, near the mirror, the electron cyclotron frequency is much higher than the plasma one, which can significantly affect the possibility of propagation of the most unstable waves outside the beam. Particle-in-cell simulations make it possible not only to find how efficiently intense plasma oscillations penetrate the rarefied periphery, but also to prove that the turbulent zone in a realistic nonuniform plasma has regions dominated by transverse electric fields. This creates the necessary conditions for efficient acceleration of the trapped particles to energies much higher than the initial beam energy.

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Electron beam-plasma discharge in GDT mirror trap: Experiments on plasma start-up with electron gun

Nuclear Fusion ◽

10.1088/1741-4326/ac3be3 ◽

2021 ◽

Author(s):

E I Soldatkina ◽

Egor Pinzhenin ◽

Olga Korobeynikova ◽

V V Maximov ◽

Dmitry Vadimovich Yakovlev ◽

...

Keyword(s):

Electron Beam ◽

Plasma Discharge ◽

Initial Energy ◽

Electron Gun ◽

Entire Volume ◽

Neutral Beams ◽

Beam Plasma ◽

Start Up ◽

Gain Energy ◽

Thin Electron

Abstract The paper describes experiments on the injection of an electron beam into a gas at the Gas Dynamic Trap (GDT) and develops a technique for creating a starting plasma with parameters sufficient for its subsequent heating by neutral beams. It is found that a relatively thin electron beam is capable of ionizing plasma in the entire volume of the trap, and the plasma turbulence it excites is capable of accelerating some of the electrons to energies tens of times higher than the initial energy of the beam. It is shown that, in contrast to early experiments on tabletop open traps, collective beam relaxation under GDT conditions occurs in the vicinity of the entrance magnetic mirror. Since the electron cyclotron frequency in this region significantly exceeds the plasma frequency, it is necessary to study the mechanism of a beam-plasma discharge under these conditions. As a first step along this path, we measure the radial diffusion coefficient of fast particles, as well as the rate at which they gain energy.

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