Two-dimensional electromagnetic Child-Langmuir law of a short-pulse electron flow

Journal Article · Tue Feb 15 04:00:00 EST 2011 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3553451· OSTI ID:21535183

Chen, S H; Tai, L C; Liu, Y L ^[1]; Ang, L K ^[2]; Koh, W S ^[3]

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1. Department of Physics, National Central University, Jhongli 32001, Taiwan (China)
2. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
3. 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, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 18; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAMS
CURRENT DENSITY
ELECTRON BEAMS
LEPTON BEAMS
MAGNETIC FIELDS
PARTICLE BEAMS
PLASMA DENSITY
PLASMA SIMULATION
SIMULATION
SPACE CHARGE