Abstract
Results are presented from numerical simulations of the time evolution of open discharges in helium that are excited in the presence of an anode grid and generate electron beams over a wide range of helium pressures (up to ∼104 Pa). It is shown that electron emission from the cathode is almost entirely dominated by the bombardment of the cathode by heavy particles, while the contribution of photoemission is negligibly small. For conditions typical of open discharges (for a helium pressure of 4 kPa and voltage amplitude of 7.4 keV), the following percentages are obtained for the partial contributions of the main processes whereby the discharge develops: 96% for atom-electron emission, 2.3% for electron multiplication in the discharge gap, 1.7% for ion-electron emission, 2 × 10−3% for electron emission under the action of metastable atoms diffusing from the discharge gap toward the cathode, and 2 × 10−4% for photoemission from the cathode.
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Translated from Fizika Plazmy, Vol. 31, No. 6, 2005, pp. 567–571.
Original Russian Text Copyright © 2005 by Karelin, Sorokin.
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Karelin, A.V., Sorokin, A.R. Numerical simulations of the development of an open discharge. Plasma Phys. Rep. 31, 519–523 (2005). https://doi.org/10.1134/1.1947337
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DOI: https://doi.org/10.1134/1.1947337