Physical nature of 'anomalous' electrons in high-current vacuum diodes
Introduction/purpose: A fundamental theoretical explanation is given for the fact that in subnanosecond vacuum diodes there exists a group of electrons with kinetic energies much higher than the applied voltage (multiplied by the value of the elementary charge) qUmax. Methods: A mathematical met...
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| Autores principales: | , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
University of Defence in Belgrade
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/0395724f76c14edb84f3e5b280a7806d |
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| Sumario: | Introduction/purpose: A fundamental theoretical explanation is given for
the fact that in subnanosecond vacuum diodes there exists a group of
electrons with kinetic energies much higher than the applied voltage
(multiplied by the value of the elementary charge) qUmax.
Methods: A mathematical method is used based on the numerical solution
of the Vlasov-Poisson differential equations system for one-dimensional
vacuum diodes of various designs.
Results: It is shown in detail that the so-called "anomalous" electrons
appear in the transient time domain characterizing the processes of
establishing current flow in vacuum diodes.
Conclusion: It has been convincingly shown that the presence of
“anomalous” electrons is not associated with either the diode design or the
presence of additional current carriers. In vacuum diodes with a
subnanosecond leading edge of the voltage pulse, the excess of energy
over qUmax can be over 20%. |
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