scholarly journals PLASMA CHARACTERISTICS IN SQUARE PULSE ARC DISCHARGE OF PLASMA CATHODE ELECTRON SOURCE DEVICE

2013 ◽  
Vol 16 (2) ◽  
Author(s):  
Agus Purwadi ◽  
Bambang Siswanto ◽  
Wirjoadi . ◽  
Lely Susita R.M. ◽  
Sudjatmoko .
Keyword(s):  
Discharge Plasma ◽  
Arc Discharge ◽  
Debye Length ◽  
Electron Plasma ◽  
Pulse Mode ◽  
Electron Source ◽  
Anode Chamber ◽  
Plasma Current ◽  
Plasma Parameters ◽  
Plasma Cathode

Plasma parameters in Plasma Cathode Electron Source Device (PCESD) are very important things because they will determine the eficiency of its electron extraction. Square pulse mode of PCESD’s arc discharge plasma current can be obtained by using Pulse Forming Network (PFN) circuits which is called Arc Discharge Power Supply (ADPS). The square pulse mode is necessity to simplify in electron irradiation dose calculation. ADPS is connected with Hollow Anode Chamber (HAC) which is placed inside of PCESD to produce arc discharge plasma. The value of arc discharge plasma current is the main key to determine plasma parameters that can be measured by using Rogowski coil. The value of the arc discharge plasma current is IADPS = 206.30 A with pulse width  = 80 μs. Whereas the plasma parameters values inside of the HAC are: the electron plasma density ne = (16.85  1019) m-3, electron plasma temperature Te = 2.609 eV, electron plasma frequency fe = 116.74 GHz, and Debye length λD = 9.958 µm respectively.

scholarly journals Measurement of plasma parameters in an electron source with a plasma cathode based on a low-pressure arc discharge

2019 ◽  
Vol 1393 ◽  
pp. 012006
Author(s):  
S Yu Doroshkevich ◽  
M S Vorobyov ◽  
S S Kovalsky ◽  
I V Lopatin ◽  
N N Koval ◽  
...  
Keyword(s):  
Arc Discharge ◽  
Low Pressure ◽  
Electron Source ◽  
Plasma Parameters ◽  
Plasma Cathode

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 COMPOSITE Cu-Cr MATERIALS UNDER THERMAL ACTION OF ELECTRIC ARC DISCHARGE PLASMA

2021 ◽  
pp. 98-101
Author(s):  
A. Murmantsev ◽  
A. Veklich ◽  
V. Boretskij ◽  
M. Bartlová ◽  
L. Dostál ◽  
...  
Keyword(s):  
Discharge Plasma ◽  
Arc Discharge ◽  
Plasma Temperature ◽  
Thermal Action ◽  
Optical Emission ◽  
Electric Arc ◽  
Composite Electrodes ◽  
Plasma Parameters ◽  
Arc Discharges ◽  
The Impact

The results of optical emission spectroscopy (OES) investigation of plasma of electric arc discharges in steadystate mode between Cu-Cr composite electrodes, manufactured at different sintered temperatures: 750, 850, 950 or 1050 °C, is presented. In particular, the impact of sintering temperature on erosion resistanceof such composite materials, which was determined in indirect manner by estimation of metal vapours content in the midsection of discharge gaps, is studied by the analysis of plasma parameters. These contents were calculated in assumption of local thermodynamic equilibrium (LTE) on the base of experimentally obtained radial distributions of plasma temperature and electron density.

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.

Millisecond Pulsed Arc Discharge in a Forevacuum-Pressure Plasma-Cathode Electron Source

2017 ◽  
Vol 45 (8) ◽  
pp. 2075-2079 ◽  
Author(s):  
Alexander V. Medovnik ◽  
Viktor A. Burdovitsin ◽  
Andrey V. Kazakov ◽  
Efim M. Oks
Keyword(s):  
Arc Discharge ◽  
Electron Source ◽  
Plasma Cathode ◽  
Pressure Plasma ◽  
Pulsed Arc Discharge ◽  
Pulsed Arc

Effects of repeated interactions and correlational disintegration on kinetic and transport properties of a non-neutral plasma in strong fields

1990 ◽  
Vol 44 (1) ◽  
pp. 167-190 ◽  
Author(s):  
Alf H. Øien
Keyword(s):  
Magnetic Field ◽  
Particle Transport ◽  
Axial Magnetic Field ◽  
Debye Length ◽  
Electron Plasma ◽  
Larmor Radius ◽  
Equilibration Time ◽  
Cylindrically Symmetric ◽  
Electric Potentials ◽  
Good Agreement

Collisions in a cylindrically symmetric non-neutral (electron) plasma, where the Larmor radius is much smaller than the Debye length, and the consequent particle transport, are studied. The plasma is confined radially by a strong axial magnetic field and axially by electric potentials. Hence two particles may interact repeatedly. Eventually they drift too far away from each other poloidally to interact any more, owing to shear in the E × B drift. The consequent build-up of correlation is limited by correlational disintegration due to collisions with ‘third particles’ between the repeated interactions. A kinetic equation including these effects is derived, and the cross-field particle transport along the density gradient is found. An associated equilibration time is shown to scale as B and to be in good agreement with the experimentally obtained values of Briscoli, Malmberg and Fine.

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