title: ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð²Ð¾Ð·Ð¼Ð¾Ð¶Ð½Ð¾ÑÑÐµÐ¹ ÑÐ¾Ð²ÐµÑÑÐµÐ½ÑÑÐ²Ð¾Ð²Ð°Ð½Ð¸Ñ Ð¿Ð¾Ð»ÐµÐ²ÑÑ ÑÐ¼Ð¸ÑÑÐµÑÐ¾Ð² Ð¸Ð· ÑÐµÑÐ¼Ð¾ÑÐ°ÑÑÐ¸ÑÐµÐ½Ð½Ð¾Ð³Ð¾ Ð³ÑÐ°ÑÐ¸ÑÐ°
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Research of possibilities to improvement of field emitters from thermally expanded graphite
Creators: name: Ð¡Ð¸Ð´Ð¾ÑÐ¾Ð²Ð°, ÐÐ½Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2024
Subjects: ÑÐ»ÐµÐºÑÑÐ¾Ð½Ð½Ð¾-Ð¾Ð¿ÑÐ¸ÑÐµÑÐºÐ°Ñ ÑÐ¸ÑÑÐµÐ¼Ð°
ÑÐ»ÐµÐºÑÑÐ¾Ð½Ð½ÑÐ¹ Ð¿Ð¾ÑÐ¾Ðº
Ð¿Ð¾Ð»ÐµÐ²Ð¾Ð¹ ÑÐ¼Ð¸ÑÑÐµÑ
Ð¿Ð¾Ð½Ð´ÐµÑÐ¾Ð¼Ð¾ÑÐ¾ÑÐ½ÑÐµ ÑÐ¸Ð»Ñ
Ð¼Ð½Ð¾Ð³Ð¾Ð¾ÑÑÑÐ¸Ð¹Ð½ÑÐ¹ ÐºÐ°ÑÐ¾Ð´
Ð¼Ð½Ð¾Ð³Ð¾ÑÐ»Ð¾Ð¹Ð½ÑÐ¹ ÐºÐ°ÑÐ¾Ð´
ÑÐµÑÐ¼Ð¾ÑÐ°ÑÑÐ¸ÑÐµÐ½Ð½ÑÐ¹ Ð³ÑÐ°ÑÐ¸Ñ
ÐºÐ¾Ð¼Ð¿Ð¾Ð·Ð¸ÑÐ½ÑÐ¹ ÑÐ¼Ð¸ÑÑÐµÑ
electron-optical system
electronic flow
field emitter
ponderomotive forces
multi-tip cathode
multilayer cathode
thermally expanded graphite
composite emitter

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description: The given work is devoted to obtaining information on the possibilities of improving composite cathodes made of thermally expanded graphite (TEG) and obtaining about on the operation of such emitters in an electron-optical system. The object of study in this work are composite field emitters composed of particles of thermally expanded graphite. A distinctive feature of such emitters is the presence of a triangular protrusion on the surface. Calculations have shown that the optimal shape of the protrusion on the cathode is an isosceles triangle with a height of 1.5 Â± 0.2 mm, a base width of 1.5 Â± 0.2 mm, and a radius of rounding of the apex of less than 20 Î¼m. Tested composite cathodes make it possible to obtain emission currents of approximately 20â30 mA, sufficient to ensure the operation of certain types of subterahertz microwave devices, including diagnostic gyrotrons. The Comsol Multiphysics application program was used to calculate the optimal geometry. It seems necessary to continue the study of carbon composite cathodes, paying special attention to considering the possibilities of increasing the uniformity of the electron flow emitted by the cathodes.