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Space-charge limited currents in coaxial diodes with electron backscatter

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4 Author(s)
Oliver, B.V. ; Mission Research Corporation, Albuquerque, New Mexico 87110 ; Genoni, T.C. ; Rose, D.V. ; Welch, D.R.

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The effect of backscattered electrons on space-charge limited currents of cylindrical (coaxial) diodes with anode center conductors is studied. The scattered electrons are parametrized by a fractional current density α and fractional energy β of the incident electrons. For bipolar flow, current enhancement factors of 2.5 are calculated for α, β≃0.5. Comparison of the model equations to one-dimensional particle-in-cell simulations with fully integrated Monte Carlo scattering algorithms demonstrates very good agreement for a range of energies and anode materials. In the absence of backscattering, the bipolar diode impedance decreases for increasing ratio of cathode to anode radius rc/ra for ratios greater than about 20. © 2001 American Institute of Physics.

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Journal of Applied Physics  (Volume:90 ,  Issue: 10 )