An electron source with a multiarc plasma emitter for obtaining submillisecond pulsed megawatt beams

Vorob’ev, M. S.; Gamermaister, S. A.; Devyatkov, V. N.; Koval, N. N.; Sulakshin, S. S.; Shchanin, P. M.

doi:10.1134/s1063785014060261

Cited by 12 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, when the pressure is at a level of 10 −2 Torr a typical gap distance amounts to about 1 cm [1,2,12]. On the other hand, the characteristic size of the gap may increase to about 100 cm when the pressure decreases to 10 −4 Torr [13][14][15][16][17]. Hence, the discharges with hollow cathode and hollow anode offer the prospect of obtaining a uniform plasma in the cavities of large volume, up to 1 m 3 .…”

Section: Introductionmentioning

confidence: 99%

Low-pressure discharges with hollow cathode and hollow anode and their applications

Korolev¹,

Koval²

2018

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The review relates to low-pressure discharges with a hollow cathode and a hollow anode. The term ‘low pressure’ implies that a neutral particle density is extremely small and the electron free path for ionization is in excess of the characteristic size for the discharge gap. On the other hand, the neutral particles still play an essential role in forming the gas-discharge plasma. Thus, the discharge regimes keep an intermediate position between the classical low-pressure discharge with avalanche ionization and pure vacuum discharge that burns in the cathode metal vapor. New approaches to the interpretation of the discharge formation mechanism at the stage of delay time to breakdown, and for the discharge sustaining features at the later temporal stages, are discussed. The developed approaches offer the possibility of interpreting the discharge behavior in the systems to obtain a uniform plasma in a large volume of the cathode or anode cavity, in the sources of electron and ion beams based on the plasma cathode and in the high-current pseudospark switches.

show abstract

Section: Introductionmentioning

confidence: 99%

Low-pressure discharges with hollow cathode and hollow anode and their applications

Korolev¹,

Koval²

2018

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The Institute of High Current Electronic SB RAS (Tomsk, Russia) develops electron sources based on a low-pressure arc with a mesh plasma cathode (Gielkens et al, 1996;Grigoryev et al, 2008;Vorob'ev et al, 2014;Vorobyov et al, 2015a, b, c) which find application in unique facilities of Russia [http://ckp-rf.ru/usu/434216]. The use of the arc discharge for the generation of emission plasma provides high energy efficiency of such electron sources as the average discharge power is no greater than 100 W at an average beam power of up to several kilowatts, and the mesh-stabilized emission boundary allows one to independently control the beam parameters (electron energy, beam current, pulse repetition frequency) and vary them over a wide range.…”

Section: Introductionmentioning

confidence: 99%

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

Vorobyov

Koval

et al. 2018

Laser Part. Beams

View full text Add to dashboard Cite

The 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.

show abstract

“…The electron sources with grid plasma cathodes are ones of the most promising electron sources when potentially considering them for technological purposes [1][2][3][4]. In scientifically searching optimum irradiation modes, these sources have a unique property of generating an electron beam, which is correlated to weak interrelation of its main parameters [5][6][7][8]. This property is achieved by using operating modes of the plasma cathode in the modes of socalled grid/layer stabilization of a boundary of the emission plasma [5,9,10].…”

mentioning

confidence: 99%

Negative current feedback in the accelerating gap in electron sources with a plasma cathode

et al. 2022

View full text Add to dashboard Cite

Using the example of an electron source with a plasma cathode based on a low-pressure arc discharge with grid stabilization of the cathode/emission plasma boundary and an open anode/beam plasma boundary, a mechanism is described for increasing the electrical strength of a high-voltage accelerating gap by introducing a series negative current feedback (NCF) in the accelerating interval, which makes it possible to level out uncontrolled bursts of the beam current during its pulse. The introduction of NCF is achieved by using a special electrode in the space of the plasma emitter connected through a resistance to the anode of the arc discharge, and the main task of which is to intercept accelerated ions penetrating into the emitter from the high-voltage accelerating gap, due to which the current of electron emission from the arc discharge plasma decreases by a value proportional to the ion current in the accelerating gap. Since most sources and accelerators of electrons with plasma cathodes based on discharges of various types have a similar principle of operation, the use of this method will not only expand the limiting parameters of the generated electron beams, but also increase the stability of the operation of such electron sources, and, accordingly, beam irradiation of various materials and products. Keywords: arc discharge, plasma cathode, electron source, electron beam, ion beam, negative feedback.

show abstract

An electron source with a multiarc plasma emitter for obtaining submillisecond pulsed megawatt beams

Cited by 12 publications

References 3 publications

Low-pressure discharges with hollow cathode and hollow anode and their applications

Low-pressure discharges with hollow cathode and hollow anode and their applications

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

Negative current feedback in the accelerating gap in electron sources with a plasma cathode

Contact Info

Product

Resources

About