Abstract :
The pulse power required by radar systems often imposes a severe load on the pulsing modulator. When traveling-wave or klystron power-output stages are used, the beam is generally pulsed by driving the accelerating electrode to cathode potential. In the past, drive potential and peak energy transfer have been reduced by the use of nonintercepting pulsing electrodes. These methods, however, are usually restricted to low-mu operation, which is inadequate in many applications. This paper describes the modifications necessary in the Pierce-type, convergent-flow electron gun for high-µ pulse beam control. Methods are suggested for the determination of grid-cathode spacing, current transmission, and other grid parameters. Design considerations are based on the space-charge-limited spherical diode. Normalized charts are presented as an aid to design use.
