Control of Characteristics of Self-injected and Accelerated Electron Bunch in Plasma by Laser Pulse Shaping on Radius, Intensity and Shape

At the laser acceleration of self-injected electron bunch by plasma wakefield it is important to form bunch with small energy spread and small size. It has been shown that laser-pulse shaping on radius, intensity and shape controls characteristics of the self-injected electron bunch and provides at certain shaping small energy spread and small size of self-injected and accelerated electron bunch.Comment: 4 pages, 5 figures. arXiv admin note: substantial text overlap with arXiv:2001.01246, arXiv:2007.1298

Homogeneous Focusing Field for Short Relativistic Electron Bunches in Plasma

Plasma wake lens in which all short relativistic electron bunches of sequence are focused identically and uniformly is studied analytically and by numerical simulation. For two types of lenses necessary parameters of focused sequence of relativistic electron bunches are formulated. Verification of these parameters is performed by numerical simulation

TRANSFORMATION RATIO AT PLASMA WAKEFIELD EXCITATION BY LONG ELECTRON BUNCH WITH SHAPING OF ITS CHARGE ACCORDING COSINE

Possibility of increase of the transformation ratio at plasma wakefield excitation by long relativistic electron bunch, which charge is shaped according to cosine, with purpose to provide the absence of oscillating (on length of bunch) decelerating wakefield, usually attainable, using bunch - precursor, is considered. Length of bunch is selected more larger than wavelength. It is shown analytically that at the choice of charge shaping of long bunch according to cosine distribution one can do without a bunch – precursor to eliminate oscillating decelerating wakefield. Thus the transformation ratio is just in one and a half times less than in the case with a precursor

FIELDS EXCITED AND PROVIDING A UNIFORM FOCUSING OF SHORT RELATIVISTIC ELECTRON BUNCHES IN PLASMA

Plasma wake lens in which all short relativistic electron bunches of sequence are focused identically and uniformly is studied analytically and by numerical simulation. For two types of lenses necessary for these parameters of focused sequence of relativistic electron bunches are formulated. Verification of these parameters is performed by numerical simulation

МЕХАНОХИМИЧЕСКИЙ СИНТЕЗ КАРБИДА ВОЛЬФРАМА С УЧАСТИЕМ РАЗЛИЧНЫХ УГЛЕРОДНЫХ КОМПОНЕНТОВ

It has been established that the basic criteria of realization of mechano-chemical tungsten carbide synthesis are the structure of carbon modifications and the degree of their aromaticity. The prospects of application of carbon modifications obtained as a result of pyrolysis of vegetative raw materials for synthesis of tungsten carbide with minimum contents of sulfur are shown.Установлено, что основными критериями реализации механохимического синтеза карбида вольфрама являются структура углеродных модификаций и степень их ароматичности. Показана перспективность использования модификаций углерода, полученных в результате пиролиза растительного сырья, для синтеза карбида вольфрама с минимальным содержанием серы