Annular electron beam generation using a ferroelectric cathode

Journal Article · Mon Jun 01 04:00:00 EDT 1998 · IEEE Transactions on Plasma Science

DOI:https://doi.org/10.1109/27.700846· OSTI ID:638445

Golkowski, C; Flechtner, D; Ivers, J D; Nation, J A; Schaechter, L ^[1]

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1. Cornell Univ., Ithaca, NY (United States)

In this paper, the authors report on the emission of electrons from a ferroelectric cathode in a coaxial gun geometry. The electrons are emitted from the inner conductor of the coaxial system and are accelerated radially. An axial magnetic field causes the formation of an azimuthal annular electron flow. The electrostatic potential distribution then leads to the ejection of the annular beam from the anode-cathode region into the drift space. A beam energy of up to 50 keV and an electron current of up to 250 A is typical in this proof of principle experiment. The Hull cutoff condition is found to considerably underestimate the magnetic field required to insulate the radial electron current flow in the diode. The results obtained are consistent with earlier data showing that the behavior of the ferroelectric is closely coupled to the changing state of the ferroelectric.

• Sponsoring Organization: USDOE, Washington, DC (United States); Department of the Air Force, Washington, DC (United States)
• OSTI ID: 638445
• Journal Information: IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 3 Vol. 26; ISSN ITPSBD; ISSN 0093-3813
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
BEAM PRODUCTION
CATHODES
ELECTRON BEAMS
ELECTRON GUNS
FERROELECTRIC MATERIALS
MICROWAVE AMPLIFIERS