High Current Density Sheet-Like Electron Beam Generator
ASTRO TERRA CORP SAN DIEGO CA
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Sheet electron beams are very desirable for coupling to the evanescent waves in small millimeter wave slow-wave circuits to achieve higher powers. In particular, they are critical for operation of the free-electron- laser-like Orotron. The program was a systematic effort to establish a solid technology base for such a sheet-like electron emitter system that will facilitate the detailed studies of beam propagation stability. Specifically, the effort involved the design and test of a novel electron gun using Lanthanum hexaboride LaB6 as the thermionic cathode material. Three sets of experiments were performed to measure beam propagation as a function of collector current, beam voltage, and heating power. The design demonstrated its reliability by delivering 386.5 hours of operation throughout the weeks of experimentation. In addition, the cathode survived two venting and pump down cycles without being poisoned or losing its emission characteristics. A current density of 10.7 Asq cm. was measured while operating at 50 watts of ohmic heating power. Preliminary results indicate that the nearby presence of a metal plate can stabilize the beam.
- Electrical and Electronic Equipment
- Electricity and Magnetism
- Particle Accelerators
- Radiofrequency Wave Propagation