Abstract
The secondary electron emission coefficients for Nb, Nb2O5, Nb3Sn, NbN, Ti, and TiN, materials applied in microwave superconducting cavities, have been measured as a function of primary electron energy from 200 to 2000 eV. Data for ’’clean’’, ’’oxidized’’, and ’’as-prepared’’ surfaces are presented. Companion Auger spectra show the constituents of the surface under test. The results should be helpful in improving techniques for preparation of surfaces of high-power rf cavities that suffer in performance from multipactoring.
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