Stability of Space-Charged-Limited Electron Beam Diodes Including Applied- and Self-Magnetic Field Effects

The theoretical analysis of large-area diodes shows that the electron flow in the diode is subject to the transit-time instability (TTI). The TTI can modulate the electron beam energy at the anode and add a transverse beam temperature. Both of these effects can have negative consequences on many dio...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2019-07, Vol.47 (7), p.3189-3203
Main Authors: Swanekamp, S. B., Ottinger, P. F., Obenschain, S. P., Rittersdorf, I. M., Myers, M. C., Kehne, D. M.
Format: Article
Language:English
Subjects:
Anode effect
Anodes
Cathodes
Computer simulation
Diodes
Electron beams
Flow stability
Gas lasers
ion beams
Laser beams
lasers
Magnetic fields
particle beams
Particle in cell technique
Periodic structures
Semiconductor lasers
Theoretical analysis
Transmission lines
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Summary:The theoretical analysis of large-area diodes shows that the electron flow in the diode is subject to the transit-time instability (TTI). The TTI can modulate the electron beam energy at the anode and add a transverse beam temperature. Both of these effects can have negative consequences on many diode applications that require a high-quality mono-energetic electron beam. A distributed transmission line model of the diode is developed which allows techniques from microwave engineering to be applied to the unstable diode. The theory suggests that a resistively loaded, periodic structure of slots in the cathode can stabilize the TTI. The results from particle-in-cell (PIC) simulations of a large-area electron-beam diode in 2-D are presented that support this conclusion.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2019.2916297