Effect of surface roughness on bandwidth of a high frequency multiple beam klystron

摘要

Effect of surface roughness on the bandwidth of a high frequency multiple beam klystron (MBK) cavity circuit is investigated. Surface roughness reduces the surface conductivity of the base material which in turn reduces the unloaded quality factor of the cavity and increases the bandwidth of the cavity. First, effective conductivity is calculated analytically for a given surface roughness, and then it is related to the quality factor and 3dB bandwidth of the cavity. Analytical results are compared with those obtained from 3D simulations.