紫外線照射による大電力高周波窓の帯電

抄録

Alumina rf windows are used at high-power rf sources, such as klystrons. The breakdown of rf windows takes place due to multipactor and flashover events on the alumina surface. Both multipactor and surface flashover have relation to the primary electron emission sites, such as the peripheral region of the alumina (the triple junction) and defects on the surface. Photoelectrons induced by ultraviolet light (UV) were emulated as primary electrons. The cathodoluminescence spectra during rf operation and the surface potential profile afterwards the rf were measured and investigated.