Abstract
A CsI salt-based cathode which is capable of producing a modest perveance, 10 s of A/cm2 electron beam for several microseconds pulse lengths, and has little susceptibility to diode closure has been experimentally characterized. This explosive field-emission CsI-coated carbon fiber cathode has operated in modest 10−5 Torr vacuums at voltages up to 160 kV, and can easily be configured to provide space-charge-limited solid or annular electron beams in arbitrarily large diameter configurations. The CsI cathode has demonstrated negligible closure for 2 μs pulses, and has operated for 200 shots with no degradation in cathode performance. Data on the operating performance of this salt cathode, including effective gap time history and streak photographs demonstrating uniformity of the current density, are presented. A comparison of CsI cathode performance with a velvet explosive field emitting cathode used in electron-beam production is also presented.
Highlights
A comparison of CsI cathode performance with a velvet explosive field emitting cathode used in electron-beam production is presented. 0 1995 American Institute of Physics
In the past fifteen years an increasing effort has been under way devoted to the application of pulsed-high current, mildly relativistic electron beams to high power microwave generation, high-energy laser pumping,’ x-ray production,’ and material response studies3 among other areas of research
Explosive field-emission cathodes are used in most research where large total current is needed Research has focused on beam emittance and brightness measurements4 as well as fast turn-on and uniform electron emission.’
Summary
McWilliams Department of Physics, University of California, Irvine, California 92717. Lovesee Voss Scientific, Albuquerque, New Mexico 87108. M. Collins Clark Sandia National Laboratories, Org. 1248, Albuquerque, New Mexico 87125. A CsI salt-based cathode which is capable of producing a modest perveance, 10 s of A/cm electron beam for several microseconds pulse lengths, and has little susceptibility to diode closure has been experimentally characterized. This explosive field-emission C&coated carbon fiber cathode has operated in modest 10T5 Torr vacuums at voltages up to 160 kV, and can be configured to provide space-charge-limited solid or annular electron beams in arbitrarily large diameter configurations.
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