The possibility of increasing the current density of a beam of charged particles (“focusing”) using tapered glass channels without involving external energy sources is currently being actively implemented for positively charged ions. In relation to electron beams, this possibility is not used due to the lack of experimental data on the process of grazing interaction of electron beams with a dielectric surface. It is necessary to study the degree of compression of the electron beam by tapering capillaries depending on their geometric parameters, as well as to study the time characteristics of the focusing process. In this work, an experimental study of the degree of compression of an electron beam with an energy of 10 keV was carried out using a glass tapering channel 15 mm long with an input/output internal diameter ratio of 1.15 mm/0.3 mm. An increase in the beam current density at the output for a capillary with the above parameters was demonstrated up to 2.7 times for a position where the channel axis is parallel to the axis of the original beam. Moreover, this increase in density is estimated for electrons that have lost no more than 1 keV of their initial energy. The stability of the process of electron transmission by a tapering capillary is also shown, regardless of the orientation of the capillary relative to the direction of the original beam.
Kristina A. Vokhmyanina – Doctor of Physical and Mathematical Sciences, senior researcher, Employee of the Scientific and Educational Laboratory of Advanced Radiation Research and Technologies, Belgorod State National Research University (NRU BelSU), Belgorod, Russia
Artem D. Pyatigor – research laboratory assistant, Employee of the Scientific and Educational Laboratory of Advanced Radiation Research and Technologies, Belgorod State National Research University (NRU BelSU), Belgorod, Russia
Valentina S. Sotnikova – Candidat of Physico-Mathematical Sciences, senior scientist, Belgorod Technological University named after V. G. Shukhov (BSTU), Belgorod, Russia
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DOI: 10.14489/glc.2024.08.pp.028-034
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