Monte Carlo simulation of electron beam air plasma characteristics |
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| Authors: | Deng Yong-Feng Han Xian-Wei and Tan Chang |
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| Affiliation: | Shaanxi Power Machine Design and Research Institute, Xi'an 710100, China; State Key Laboratory of Materials Modification By Laser, Ion and Electron Beams, Department of Physics, Dalian University of Technology, Dalian 116085, China |
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| Abstract: | A high-energy electron beam generator is used to generate a plasma
in atmosphere. Based on a Monte Carlo toolkit named GEANT4, a model
including complete physics processes is established to simulate the
passage of the electron beam in air. Based on the model, the
characteristics of the electron beam air plasma are calculated. The
energy distribution of beam electrons (BEs) indicates that
high-energy electrons almost reside in the centre region of the
beam, but low-energy electrons always live in the fringe area. The
energy deposition is calculated in two cases, i.e., with and without
secondary electrons (SEs). Analysis indicates that the energy
deposition of SEs accounts for a large part of the total energy
deposition. The results of the energy spectrum show that the electrons
in the inlet layer of the low-pressure chamber (LPC) are monoenergetic,
but the energy spectrum of the electrons in the outlet layer is not
pure. The SEs are largely generated at the outlet of the LPC.
Moreover, both the energy distribution of BEs and the magnitude of
the density of SEs are closely related to the pressure of LPC. Thus,
a conclusion is drawn that a low magnitude of LPC pressure is
helpful for reducing the energy loss in the LPC and also useful for
greatly increasing the secondary electron density in dense air. |
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| Keywords: | electron beam discharge plasma
simulation Geant4 |
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