Journal
APPLIED PHYSICS LETTERS
Volume 82, Issue 2, Pages 179-181Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1537510
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Inserting a slab of honeycomb ceramic in front of the emitting surface of a large-area cathode improves the electron beam emission uniformity, decreases the beam current rise and fall times, and maintains a more constant diode impedance. Moreover, changing the cathode material from velvet to carbon fiber achieved a more robust cathode that starts to emit at a higher electric field without a degradation in beam uniformity. In addition, an 80% reduction in the postshot diode pressure was also observed when gamma alumina was deposited on the ceramic. A possible explanation is that reabsorption and recycling of adsorbed gases takes place. (C) 2003 American Institute of Physics.
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