Two-dimensional electromagnetic Child-Langmuir law of a short-pulse electron flow
- Department of Physics, National Central University, Jhongli 32001, Taiwan (China)
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
- Institute of High Performance Computing, A-STAR, Singapore 138632 (Singapore)
Two-dimensional electromagnetic particle-in-cell simulations were performed to study the effect of the displacement current and the self-magnetic field on the space charge limited current density or the Child-Langmuir law of a short-pulse electron flow with a propagation distance of {zeta} and an emitting width of W from the classical regime to the relativistic regime. Numerical scaling of the two-dimensional electromagnetic Child-Langmuir law was constructed and it scales with ({zeta}/W) and ({zeta}/W){sup 2} at the classical and relativistic regimes, respectively. Our findings reveal that the displacement current can considerably enhance the space charge limited current density as compared to the well-known two-dimensional electrostatic Child-Langmuir law even at the classical regime.
- OSTI ID:
- 21535183
- Journal Information:
- Physics of Plasmas, Vol. 18, Issue 2; Other Information: DOI: 10.1063/1.3553451; (c) 2011 American Institute of Physics; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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