Parameters and characteristics of a pulsed constricted arc discharge operating in a forevacuum-pressure plasma-cathode electron beam source

AbstractWe describe here the design, main parameters, and characteristics of a forevacuum-pressure plasma-cathode electron source based on a hollow-cathode discharge. The source generates a continuous focused electron beam with energy up to 30 keV and current up to 300 mA at a pressure of 10–50 Pa. The focused electron beam reaches a maximum power density of 106 W/cm2. The source utility has been demonstrated by its application for processing and cutting of ceramic.

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Influence of electron emission on operation of a constricted arc discharge in a pulsed forevacuum plasma-cathode electron source

Journal of Physics Conference Series ◽

10.1088/1742-6596/2064/1/012124 ◽

2021 ◽

Vol 2064 (1) ◽

pp. 012124

Author(s):

A V Kazakov ◽

E M Oks ◽

N A Panchenko

Keyword(s):

Electron Beam ◽

Electron Emission ◽

Arc Discharge ◽

Electron Source ◽

Operating Voltage ◽

Large Radius ◽

Plasma Cathode ◽

Discharge System ◽

Arc Voltage ◽

Minimum Value

Abstract The research of influence of electron emission and processes associated with the formation of a pulsed large-radius electron beam on operation of a constricted arc discharge, which forms emission plasma in a forevacuum plasma-cathode electron source, is presented. Processes, occurring in case of generation of the electron beam at forevacuum pressure range 3–20 Pa, provide lower operating voltage of the constricted arc discharge. The constricted arc voltage decreases with increasing pressure and increasing accelerating voltage. However, at pressure more than 15 Pa, the arc voltage decreases until a certain minimum value is reached, and then arc voltage is almost independent on pressure and accelerating voltage. This minimum value of the constricted arc voltage is on average 1.5–2 times higher as compared with voltage of the cathodic arc at the same discharge current. The observed decrease of operating voltage of the constricted arc is most likely caused by accelerated back-streaming ions, which move toward the emission electrode from beam-produced plasma. These accelerated ions partially penetrate into the hollow anode of discharge system through the mesh emission electrode and facilitate formation of the arc plasma, and thus provides lower voltage of the constricted arc.

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Features of the Formation of a Focused Electron Beam by a Forevacuum-Pressure Plasma-Cathode Source With Single Emission Channel

IEEE Transactions on Plasma Science ◽

10.1109/tps.2021.3139344 ◽

2022 ◽

pp. 1-6

Author(s):

Ilya Yu. Bakeev ◽

Aleksandr S. Klimov ◽

Efim M. Oks ◽

Aleksey A. Zenin

Keyword(s):

Electron Beam ◽

Plasma Cathode ◽

Pressure Plasma ◽

Emission Channel ◽

Single Emission

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Generation, transport, and efficient extraction of a large cross-section electron beam into an air in an accelerator with a mesh plasma cathode

Laser and Particle Beams ◽

10.1017/s0263034617000969 ◽

2018 ◽

Vol 36 (1) ◽

pp. 22-28 ◽

Cited By ~ 1

Author(s):

Maxim S. Vorobyov ◽

Tamara V. Koval ◽

Nikolay N. Koval ◽

Nguyen Bao Hung

Keyword(s):

Electron Beam ◽

Cross Section ◽

Beam Energy ◽

Arc Discharge ◽

Theoretical Research ◽

Metal Foil ◽

Large Cross Section ◽

Plasma Parameters ◽

Plasma Cathode ◽

Discharge System

AbstractThe paper presents experimental and theoretical research data on the generation, transport, and extraction of a large cross-section (750 × 150 mm2) electron beam into the air through a thin metal foil in an accelerator with a mesh plasma cathode on the bases of a low-pressure arc and with a multi-aperture two-electrode electron-optical system. When the burning conditions of the arc discharge, responsible for the generation of the emission plasma, is changed, the characteristics of this plasma were investigated, including under the conditions of the selection of electrons from it. Our experiments show that at an accelerating voltage of 200 kV, current in the accelerating gap of up to 30 A, and full width at half maximum of up to 100 µm, the average extracted power is ≈4 kW and the extracted beam current is ≈85% from the common current into the accelerating gap. Our numerical estimates give a good correlation between the arc and emission plasma parameters depending on the electrode configuration in the discharge system and on the mechanism of electron beam generation. Analysis of the emission plasma parameters under different arc conditions and of the mechanisms responsible for the beam energy loss suggests that most of the energy in the accelerator is lost at the support grid and at the output foil due to defocusing of the beam and partial electron reflection from the foil. Other mechanisms that decrease the extracted beam energy are discussed.

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Electron Beam Sintering of Zirconia Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.872.150 ◽

2013 ◽

Vol 872 ◽

pp. 150-156 ◽

Cited By ~ 11

Author(s):

Victor Burdovitsin ◽

Edgar S. Dvilis ◽

Aleksey Zenin ◽

Aleksandr Klimov ◽

Efim Oks ◽

...

Keyword(s):

Grain Size ◽

Electron Beam ◽

Zirconium Dioxide ◽

Sintered Material ◽

Sintering Temperature ◽

Vacuum Pressure ◽

Zirconia Ceramics ◽

Beam Source ◽

Plasma Cathode ◽

Sintering Conditions

The work demonstrated the sintering of zirconium dioxide ceramics by means of an electron beam produced by a plasma-cathode e-beam source operating at fore-vacuum pressure. The sintered ceramics consist of tetragonal-modified zirconium dioxide with grain size from 0.7 to 10 micrometers, depending on the sintering conditions. At constant sintering temperature, the density of the material and its grain size depend on the integrated energy injected into the sintered material by the electron beam.

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