Collective ion acceleration in systems with a virtual cathode

Дубинов, А. Е.; Kornilova, I. Yu.; Селемир, В. Д.

doi:10.3367/ufnr.0172.200211a.1225

Cited by 32 publications

(19 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It looks very probable that the appearance of double wells might explain the double neutron peak observed sometimes in experiment (as in fig.5 [10]). We can see there that the PW lifetime in particular experiment is about T P W ≈ 20-25 nsec, and after that the VC has to be neutralized (T P W >> ω The model of collective ion acceleration [26] at a vacuum discharge, based on the concept of nonstationary potential wells (PW) before the front of the cathode flare in the regimes of non-stable current carrying, was developed earlier [27]. On the basis of this model the explanations were given for the early experimental data of A.A. Plutto [28] on occasional anomalous ions acceleration.…”

Section: Introductionmentioning

confidence: 99%

Warm Dense Matter Generation and DD Synthesis at Vacuum Discharge with Deuterium‐Loaded Pd Anode

Kurilenkov

Тараканов

Gus’kov

et al. 2011

Contrib. Plasma Phys.

View full text Add to dashboard Cite

The energetic ions and DD neutrons from microfusion at the interelectrode space of a low energy nanosecond vacuum discharge with deuterium-loaded Pd anode has been demonstrated recently. To understand better the physics of fusion processes the detailed PIC simulation of the discharge experimental conditions have been developed using a fully electrodynamic code KARAT. The dynamics of main charge particle species was reconstructed in time and interelectrode space. The principal role of a virtual cathode (VC) and the corresponding single and double potential well formed in the interelectrode space are recognised. The calculated depth ϕ of the quasistationary potential well (PW) of the VC is about 50-60 kV, and the D + ions being trapped by this well accelerate up to energy values needed to provide collisional DD nuclear synthesis. Both experiment and PIC simulations illustrate very favourable scaling of the fusion power density at decreasing of VC radius ( ∼ ϕ 2 /r 4 V C ) for the chosen inertial electrostatic confinement fusion scheme based on miniature nanosecond vacuum discharge. Meanwhile, the initial stage of discharge is understood still poorly. When voltage is applied, the electron beam extracted from cathode starts to interact with the surface of deuterium-loaded Pd anode. This early stage of discharge manifests sometime the peaks registered by photomultipliers which are similar to neutron ones from time-of-flight measure under the study of collisional DD synthesis at the further stages of discharge. The detailed study of Pd anode surface morphology have been performed and recognized, in particular, the number of various pores and craters of different sizes. We remark that besides of rather usual craters (due to electron beams -anode interaction) some of the craters on the Pd anode surface may correspond to anode ectons (explosive centres) and consider their possible nature. Specifics of warm dense matter (WDM) generated at different stage of discharge is discussed. The data obtained are compared with recent results on initiation of DD reactions by electron beams at deuterium -loaded Pd foils and correspondent data on their surface morphology.

show abstract

Section: Introductionmentioning

confidence: 99%

Warm Dense Matter Generation and DD Synthesis at Vacuum Discharge with Deuterium‐Loaded Pd Anode

Kurilenkov

Тараканов

Gus’kov

et al. 2011

Contrib. Plasma Phys.

View full text Add to dashboard Cite

show abstract

“…As a result of the positive potential on the anode, the electrons do not leave the system but rather oscillate between the real and virtual cathodes [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The microwave emission is attributed to the phase bunching of the oscillating electrons inside the potential well of the system [2][3][4][5][6][7].…”

Section: Concept Of Virtual Cathode Oscillatormentioning

confidence: 99%

“…The microwave emission frequency from the virtual cathode oscillator is usually explained by two dynamical mechanisms [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]: first is by the oscillating virtual cathode in the space and time with a well-defined period. This oscillation results in severe longitudinal charge bunching and second mechanism is the trapping of the electrons in the potential well formed between the real and virtual cathodes.…”

Section: Microwave Generation Mechanismmentioning

confidence: 99%

“…Among the several types of pulsed high-power microwave generators, the virtual cathode oscillator has been considered very attractive because of its conceptual and mechanical simplicity, high output power capability [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] and possible wide-bandwidth with frequency tunable characters which make it attractive for applications where the highpower and wide-bandwidth is acceptable. This device is based on a special class of the bremsstrahlung radiation of the relativistic electrons oscillating axially in the electrostatic fields [4,5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Feasibility Study of Axially- Extracted Virtual Cathode Oscillator

Singh

Kartikeyan

2007

Int J Infrared Milli Waves

View full text Add to dashboard Cite

In this paper, we have analyzed the design parameters of the axially -extracted virtual cathode oscillator, which is high-power microwave source based on the concept of the virtual cathode associated with the intense relativistic electrons beam oscillations in the electrostatic potential well. The microwave emission by the virtual cathode oscillator results from both the space and time oscillations of virtual cathode and reflexing electrons trapped in the potential well between the virtual and real cathodes. In the X-band frequency spectrum 700 MW microwave peak power has been obtained analytically by the solid electron beam of 300 kV and 20 kA for feasible design parameters. The analysis has been performed by 2-dimensional, relativistic, electromagnetic particle-in-cell simulation code XOOPIC.

show abstract

“…The significance of this problem has been indicated in a substantial number of related works (see, for example, [1][2][3][4][5][6][7][8][9][10]). This study is important for the fundamental investigation processes governing formation of the chaotic dynamics and structures in the beam-plasma systems [5,6,8,9,[11][12][13], for the applied analysis related to the development and optimization of the VC-based high-power microwave oscillators (vircators) [4,5,8,14], for acceleration of charged particles with an oscillating VC [15,16], and for creation of the sources of broadband noiselike radiation with different power levels [10,17].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the formation of structures and chaotic dynamics in a nonrelativistic electron beam with a virtual cathode in the presence of a decelerating field

Egorov¹,

Kalinin²,

Короновский³

et al. 2007

J. Commun. Technol. Electron.

View full text Add to dashboard Cite

1 Note a certain relation between oscillations in such an electron system with deceleration and oscillations in the BarkhausenKurz oscillator [19] and oscillations in an electron-wave oscillator with a decelerating field ([20, Chapter 5] Abstract -A nonrelativistic electron beam with a virtual cathode situated in the diode gap with a decelerating field is experimentally and theoretically studied. A 1D model of the electron beam in the presence of a decelerating field is constructed. Nonlinear nonstationary processes in this system are investigated by means of numerical analysis of the model. The processes are described and interpreted with regard to formation and interaction of structures in the electron flow. The theoretical results are qualitatively confirmed by the experimental data showing that the system under study can be considered as a promising controlled source of chaotic oscillations in the microwave range.

show abstract

Collective ion acceleration in systems with a virtual cathode

Cited by 32 publications

References 56 publications

Warm Dense Matter Generation and DD Synthesis at Vacuum Discharge with Deuterium‐Loaded Pd Anode

Warm Dense Matter Generation and DD Synthesis at Vacuum Discharge with Deuterium‐Loaded Pd Anode

Feasibility Study of Axially- Extracted Virtual Cathode Oscillator

Analysis of the formation of structures and chaotic dynamics in a nonrelativistic electron beam with a virtual cathode in the presence of a decelerating field

Contact Info

Product

Resources

About