Study on rf voltage breakdown for LHRH in 0. 8 to 0. 9 GHz

Radio frequency breakdown in the frequency range of 0.8 to 0.9 GHz was investigated in a re-entrant type resonator and in a partially concave waveguide. Characteristics of the breakdown are significantly dependent on the uniformity of the RF field as well as the presence of initial electrons, but independent of the filling pressure of hydrogen gas below .001 torr. The mechanism of breakdown is mainly reduced to the secondary electron resonance breakdown.