Generation of electron beam with millisecond pulse duration by plasma-cathode source based on the arc discharge in the fore-vacuum pressure range

2017 ◽  
Author(s):  
Anna Andreichik ◽  
Victor Burdovitsin ◽  
Andrey Kazakov ◽  
Alexander Medovnik ◽  
Efim Oks
Keyword(s):  
Electron Beam ◽  
Pulse Duration ◽  
Pressure Range ◽  
Arc Discharge ◽  
Vacuum Pressure ◽  
Plasma Cathode ◽  
Millisecond Pulse

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

Vacuum ◽  
2019 ◽  
Vol 163 ◽  
pp. 31-36 ◽  
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

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

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.

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

2018 ◽  
Vol 36 (1) ◽  
pp. 22-28 ◽  
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.

Electron Beam Sintering of Zirconia Ceramics

2013 ◽  
Vol 872 ◽  
pp. 150-156 ◽  
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.

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

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.

Effect of working gas on the electron-beam heating of a ceramic target in the fore-vacuum pressure range

Vacuum ◽  
2020 ◽  
Vol 179 ◽  
pp. 109500
Author(s):  
D.B. Zolotukhin ◽  
E.M. Oks ◽  
A.V. Tyunkov ◽  
Yu.G. Yushkov ◽  
A.A. Zenin
Keyword(s):  
Electron Beam ◽  
Pressure Range ◽  
Vacuum Pressure ◽  
Ceramic Target ◽  
Beam Heating ◽  
Electron Beam Heating
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