Open AccessDark current measurements at field gradients above 1 GV/m
Author(s) -
T. Srinivasan-Rao,
J. Smedley,
J. Schill,
K. Batchelor,
Joseph Farrell
Publication year - 1998
Publication title -
osti oai (u.s. department of energy office of scientific and technical information)
Language(s) - English
Resource type - Reports
DOI - 10.2172/677134
Subject(s) - current (fluid) , cathode , field (mathematics) , dark current , copper , field electron emission , anode , work function , range (aeronautics) , physics , materials science , astrophysics , analytical chemistry (journal) , atomic physics , chemistry , metallurgy , optics , electrode , electron , composite material , mathematics , nuclear physics , thermodynamics , metal , quantum mechanics , chromatography , pure mathematics , detector
In this paper, the authors report the results of dark current studies on copper cathodes and stainless steel anodes held at a field gradient > 1 GV/m. The field emission current is , 1 A for fields less than 1 GV/m. As the field is increased, the dark current increases rapidly to 150 A for applied fields of {approximately} 1.7 GV/m. Fowler-Nordheim plots in this range of applied fields indicate a field enhancement factor of 10--20 for a copper cathode with a work function of 4.6 eV
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