beam coupling coefficient of the hollow beam coupling coefficient of the beam coupling coefficient of the beam coupling coefficient of the hollow beam coupling coefficient of the hollow beam coupling coefficient of the multi beam relativistic klystron amplifier design of the radio frequency multi beam relativistic klystron amplifier multi beam relativistic klystron amplifier design of the radio frequency design of the radio frequency design of the radio frequency design of the radio frequency multi beam relativistic klystron amplifier multi beam relativistic klystron amplifier multi beam relativistic klystron amplifier multi beam relativistic klystron amplifier design of the radio frequency beam coupling coefficient of the hollow design of the radio frequency beam coupling coefficient of the hollow multi beam relativistic klystron amplifier design of the radio frequency design of the radio frequency design of the radio frequency multi beam relativistic klystron amplifier beam coupling coefficient of the hollow multi beam relativistic klystron amplifier beam coupling coefficient of the hollow multi beam relativistic klystron amplifier multi beam relativistic klystron amplifier multi beam relativistic klystron amplifier beam coupling coefficient of the hollow design of the radio frequency multi beam relativistic klystron amplifier multi beam relativistic klystron amplifier beam coupling coefficient of the hollow multi beam relativistic klystron amplifier beam coupling coefficient of the hollow design of the radio frequency beam coupling coefficient of the beam coupling coefficient of the design of the radio frequency design of the radio frequency design of the radio frequency high power ka band klystron coupling coefficient estimation design of the radio frequency coupling coefficient estimation high power ka band klystron