Enhancement of emission currents in plasma electron sources based on a low-pressure arc discharge

T. V. Koval, V. N. Devyatkov, Nguyen Bao Hung

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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 p = 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.

Original languageEnglish
Article number012061
JournalJournal of Physics: Conference Series
Volume652
Issue number1
DOIs
Publication statusPublished - 5 Nov 2015

Fingerprint

electron sources
arc discharges
electron emission
low pressure
grids
plasma generators
augmentation
electric potential
cathodes
electron beams
positive feedback
ion emission
plasma potentials
electrodes
gas pressure
mesh
chambers
electric fields
gases
magnetic fields

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Enhancement of emission currents in plasma electron sources based on a low-pressure arc discharge. / Koval, T. V.; Devyatkov, V. N.; Hung, Nguyen Bao.

In: Journal of Physics: Conference Series, Vol. 652, No. 1, 012061, 05.11.2015.

Research output: Contribution to journalArticle

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AB - 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 p = 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.

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