Abstract
In a three-factor, two-level, full-factorial experiment the variation of the ultimate prebreakdown current I B has been studied when changes were made in the preparatory treatment of each of two copper electrodes by firing in hydrogen or vacuum. An increase in the electrode area was found to reduce I B for the complete range of gap spacing. Log I B was greatly reduced when the gap was progressively extended from 0.5–1.5 cm, but the reverse was true for the gap range 2.5–3.0 cm. The roles played by pretreatment of each electrode were revealed and the influence of cathode pretreatment alone was found to be consistent with the theory of field emission from oxide coated surfaces. A successful interpretation of the area effect and of the manner in which it is influenced by electrode pretreatment has been achieved by consideration of the discharge of the electrode capacitance during the voltage collapse.
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