Abstract
Among the various methods proposed to reduce the electron field emission in Nb superconducting cavities, the authors have investigated oxidisation and compared the DC field emission current from bare Nb plane surfaces with that from oxidised ones. The thickness of the Nb2O5 layer (from 0 to 160 nm), temperature (normal and superconducting states) and previous electronic bombardment were considered. Experiments show that threshold and breakdown DC voltages increase with the thickness of the oxide layer up to 160 nm. The improvement seems to be independent of the temperature and of previous electronic bombardment.
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