量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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Plasma created by heavy ion irradiation was studied through Debye shield formation, track potential (TP), and the transport of secondary electrons. The Debye shield addressed here is expected to be useful for damage evaluation of the target. Here, the Debye shield is the electric-field shield produced by electrons surrounding locally positioned ions, and the TP is the potential created from the electric field near the incident ion’s path (IP). To study the Debye shield formation, the probability (Pset) of secondary electrons escaping the TP was simulated. It was found that (i) the electron densities, which form the Debye shield, resulting from simulation near the IP are controlled by the Poisson’s equation, (ii) these densities are given only by a function of cross-sections of incident ion impact ionization when the incident ion energy and the number density of molecules in the target are fixed, and (iii) a simple formula derived from a solution of the Poisson’s equation almost reproduces the simulated probability Pset.
Debye shield formed by track potential and transport of secondary electrons in heavy ion irradiation
