Dynamic Power Control of a Submillisecond Pulsed Megawatt Electron Beam in a Source with a Plasma Cathode

Vorobyov, Maxim; Moskvin, P. V.; Shin, V. I.; Koval, N. N.; Ashurova, K. T.; Doroshkevich, S. Yu.; Devyatkov, V. N.; Torba, M. S.; Levanisov, V. A.

doi:10.1134/s1063785021050291

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…The unique feature of this type of electron source is the possibility of controlling the beam current, which is weakly dependent on the accelerating voltage [30]. Thus, it is possible to control the beam power in the submillisecond range of pulse durations [31] and, hence, the rate of energy delivery to the surface of a treated target within a beam current pulse [32]. The control of energy delivery makes it possible to control the temperature field in the target surface layer and, hence, its structure and phase state.…”

Section: Test Materials and Treatment Methodsmentioning

confidence: 99%

Steel Surface Doped with Nb via Modulated Electron-Beam Irradiation: Structure and Properties

Vorobyov,

Petrikova,

Shin

et al. 2023

Coatings

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A niobium film on an AISI 5135 steel substrate was exposed to submillisecond pulsed electron-beam irradiation with controlled energy modulation within a pulse to increase the film–substrate adhesion. This modulated irradiation made it possible to dope the steel-surface layer with Nb through film dissolution in the layer, for which optimum irradiation conditions were chosen from experiments and a mathematical simulation. The irradiated system was tested for surface hardness and wear, and its surface structure and elemental composition were analyzed. The results demonstrate that the microhardness of the irradiated system is much higher and that its wear rate is much lower compared to the initial state.

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Section: Test Materials and Treatment Methodsmentioning

confidence: 99%

Steel Surface Doped with Nb via Modulated Electron-Beam Irradiation: Structure and Properties

Vorobyov,

Petrikova,

Shin

et al. 2023

Coatings

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“…The beam is developed from a plasma cathode with grid stabilization of the emission plasma boundary. In this way, the beam energy density reaches up to 100 J/cm 2 with electron accelerating voltage of 5-25 kV and beam current of 20-300 A [7][8][9].…”

Section: Introductionmentioning

confidence: 98%

Investigation on the properties of anodic oxides grown on aluminium-silicon alloys irradiated by pulsed electron beam

Bestetti,

Andrea,

Batuhan

et al. 2023

MTD

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Al-Si alloys are among the most common aluminium based materials for cast products due to theirhigh strength-to-weight ratio, excellent processability and relatively low cost. The presence of Si inthe molten Al phase improves the castability and decreases the solidification shrinkage. Hard anodicoxidation is largely employed to improve their surface mechanical properties and corrosion resistance.However, the presence of high Si contents (> 3%) and the size of Si particles in the alloy makethe process challenging or even not possible. The surface pretreatment of Al-Si alloys with intensepulsed electron beams (EB) can effectively overcome the aforementioned limitations. Electron beamsources can be employed to reduce Si content and to refine and disperse Si particles, and effectivelycreate an Al substrate that is more prone to oxidization. In the present work, two electron beamunits were used, RITM-SP and SOLO, to modify the surface properties of hypoeutectic, eutectic andhypereutectic Al-Si alloys, by investigating the effect of energy density and number of pulses. Theelectron beam treated substrates were hard anodized and characterized in term of microstructure,elemental distribution, corrosion resistance and surface mechanical properties.

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“…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]. For example, using this property of the plasma cathodes allowed demonstrating a unique possibility of dynamically controlling the power of the electron beam for the pulse duration of a millisecond [11,12]. It allowed controlling an energy input rate of a surface of metallic materials and even maintaining the surface temperature of irradiated sample at thousands of degrees within the same time range [13].…”

mentioning

confidence: 99%

“…As in [11], the present study also uses the " SOLO" electron source with the grid plasma cathode and the plasma anode with the open plasma boundary (Fig. 1).…”

mentioning

confidence: 99%

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

et al. 2022

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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.

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Dynamic Power Control of a Submillisecond Pulsed Megawatt Electron Beam in a Source with a Plasma Cathode

Cited by 11 publications

References 12 publications

Steel Surface Doped with Nb via Modulated Electron-Beam Irradiation: Structure and Properties

Steel Surface Doped with Nb via Modulated Electron-Beam Irradiation: Structure and Properties

Investigation on the properties of anodic oxides grown on aluminium-silicon alloys irradiated by pulsed electron beam

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

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