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Название: Enhancement of emission currents in plasma electron sourcesbased on a low-pressure arc discharge
Авторы: Koval, Tamara Vasilievna
Devyatkov, V. N.
Nguyen Bao Hung
Ключевые слова: токи; эмиссия; плазма; источники электронов; дуговые разряды; низкое давление
Дата публикации: 2015
Издатель: IOP Publishing
Библиографическое описание: Koval T. V. Enhancement of emission currents in plasma electron sourcesbased on a low-pressure arc discharge / T. V. Koval, V. N. Devyatkov, Nguyen Bao Hung // Journal of Physics: Conference Series. — 2015. — Vol. 652 : Gas Discharge Plasmas and Their Applications (GDP 2015) : 12th International Conference, 6–11 September 2015, Tomsk, Russia : [proceedings]. — [012061, 6 p.].
Аннотация: The paper reports on a theoretical and experimental study of the discharge plasma generation with an enhanced electron emission current in a plasma electron source based on a low-pressure arc discharge with a grid-stabilized plasma emission boundary. The source operates at a pressure in the working chamber of р = 0.02–0.05 Pa (Ar), accelerating voltage of up to Ua = 10 kV, and longitudinal magnetic field for electron beam transport of up to Bz = 0.1 T. The experiments show that in the mode of electron emission from the plasma, the voltage Ud between the cathode and grid electrode changes its sign. The numerical simulation demonstrates that the plasma potential and voltage Ud depend on the electric field penetrating from the acceleration gap into the discharge region through the grid meshes, and on the discharge current, gas pressure, geometric transparency of the grid, and gas kind. It is shown that the main mechanisms responsible for the increase in the discharge current and electron emission current from the plasma are associated with secondary ion-electron emission from the emission electrode and with positive feedback between the region of cathode plasma generation and the channel of electron beam transport.
URI: http://earchive.tpu.ru/handle/11683/18233
Располагается в коллекциях:Материалы конференций

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