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TUPSB46 |
Quasi-continuous X-ray and Electron Generation in LiTaO3-based Pyroelectric Accelerator Driven by Periodically Varying Temperature | |
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Funding: The work was supported by the RSF grant #21-72-00006. The work of A.K. was financially supported by a Program of the Ministry of Education and Science, project No. FZWG-2020-0032 (2019-1569). The pyroelectric effect in lithium tantalate (LiTaO3) single crystals provides a curious possibility to generate fluxes of electrons and x-rays with energy up to 100 keV. Basic conditions for initiation of this phenomenon are low pressure of residual gas around the pyroelectric crystal (0.1 - 10 mTorr) and changing of its temperature. However, this way of particles generation does not become widely used yet due to the instability of generated particle flux. Here we present that application of sinusoidal changing of temperature may overcome this shortcoming and obtain a quasi-stable X-ray and electron pyroelectric source. We managed to observe and characterise the avalanche process at the pyroelectric effect. This phenomenon is responsible for the multiplication of electrons and X-rays. The great potential of this compact X-ray source by performing reliable energy-dispersive X-ray spectroscopy for element analysis of two solid samples was demonstrated. |
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WEPSC47 |
Controlling of 10 keV Electron Beam Using Different Dielectric Channels | |
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| Since the 2000s, studies of the possibility of controlling beams of charged particles using dielectric channels have become increasingly popular in view of the potential for creating autonomous and simple devices. The effect of controlling charged particles is due to the formation of a self-consistent charge distribution on the inner walls of the dielectric channel, which ensures the passage of a part of the beam without direct contact with the channel surface. Control efficiency is characterized by the value of transmitted beam current, energy state of the particles passing through a channel, stability of a channel transmission, and spatial-angular characteristics of the transmitted beam. This paper presents the results of an experimental study of the effect of controlling a 10 keV electron beam using various dielectric channels (PET nanocapillary foils, glass tapered capillaries, ceramic macrocapillaries, an array of polysulfone fiber tubes, etc.). Also presented are the results of measuring the time dependence of the passage of an electron beam with an energy of 10 keV and a beam current of about 1.8 ¿A through PVC tubes bent into rings at 360 °. The data obtained indicate the possibility of effective use of various dielectric channels as autonomous elements of electronic optics. | ||
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