Summary
This paper presents experimental results on the effects of increasing gas pressure on electron gun operations. The electron gun used is the gun EGA which has been developed for the TSS-1 mission. Various gases have been used with pressures in the range from 10−6 to a few times 10−3 mbar. The measurements, taken in a vacuum chamber, show a steady increase in the slope of theI–V characteristics of the gun when the pressure is increased, as a consequence of ionization phenomena induced by the electron beam. Further measurements have been taken of the overall current on a target at some distance from the gun itself. An attempt is also made at a theoretical calculation of the effects observed, based on simplified models.
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References
C. Bonifazi, P. Musi, G. Cirri andM. Cavallini:TSS core Equipment: A high perveance electron generator for the electrodynamic mission inSpace Tethers for Science in the Space Station Era, edited byL. Guerriero andI. Bekey (Editrice Compositori Bologna, 1987), p. 230.
I. Langmuir:Phys. Rev.,2, 450 (1913).
I. Langmuir:Phys. Rev.,33, 6 (1929).
K. Spangenberg:Vacuum Tubes (Mc Graw Hill, New York, 1948).
G.I. Brewer:Focusing of high density electron beams inFocusing of Charged Particles, edited by A. Septier (Academic Press, 1967), p. 73.
A. Von Engel:Ionized Gases (Oxford University Press, 1965).
S.C. Brown:Basic Data of Plasma physics (MIT Press, Cambridge, 1965).
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Cirri, G., Bianconi, M., Cordero, F. et al. Operation of the EGA electron gun at high gas pressures. Il Nuovo Cimento C 15, 203–217 (1992). https://doi.org/10.1007/BF02507614
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DOI: https://doi.org/10.1007/BF02507614