Result correction of concentration ratio inlet measurement for quantitative mass-spectrometry

Abstract

PIC-modeling of a multilayer virpertron with a dielectric insert placed in the drift tube is carried out. This dielectric insert consists of four dielectric layers with dielectric permittivity decreasing discontinuously along the course of the beam. It is shown that in a four-layer weakly relativistic virpertron (150 keV, 2 kA) it is possible to achieve a multivibrator mode with a number of virtual cathodes not less than four. The densitogram of the electron beam was calculated. It was found that a complex spatial-wave dynamics of the electron beam characterized by a direct wave of spatial charge and a multiplicity of virtual cathodes occurs in the virpertron. This leads to the generation of powerful microwave electromagnetic fields in the drift tube. The energy spectrogram of the electron beam was calculated. It showed the redistribution of electron energy in time. A group of fleeing electrons and a large group of slow electrons with energy corresponding to the VC appear. The spectrogram of microwave fields in the virpertron has been calculated. The spectrogram has the appearance characteristic of a noise-like signal in the range from 1 to 5 GHz.
Computer modeling was carried out using the PIC-code KARAT [1].

Key words: virtual cathode, virpertron, intense electron beam, multivircator, electrons dynamics, particle-in-cell modeling.



References

1. User’s Manual for Code KARAT. Berkley Res. Associates / Tarakanov V.P.: Springfield, 1992.

Speaker

Herman N. Kolesov
Russian Federal Nuclear Center – All-Russia Scientific Research Institute of Experimental Physics
Russia

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