Nanosecond beam intensification for cathode-ray tubes

A gun structure capable of nanosecond beam intensification has been developed. The paper will present design details and test results. The development was prompted by an immediate need for such a device in a specific project. However, with the trend towards shorter duration pulses, the development of wide-bandwidth oscilloscopes and high-scan-rate television systems, a gun structure capable of nanosecond beam intensification should have many applications. The design also provides for better control of the spot size than is possible with a conventional gun. Preliminary tests of an experimental tube have shown that the gun is capable of producing a visible display of a single 1-nsec pulse, of 10 v intensification voltage with an accelerating potential of 24 kv.