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Plasma Optimization in a Multicusp Ion Source by Using a Monte Carlo Simulation
M. Hosseinzadeh,H. Afarideh 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
A Monte Carlo simulation code has been developed to optimize the number of magnets confiningthe plasma in the H- multicusp ion source. This code improves the existing drawbacks in the particlestudio CST program and predicts the lifetime of primary electrons and the effects of collisions ofelectrons and hydrogen gas atoms. In this simulation are found 12 cusps to provide the highestplasma intensity in our configuration. Finally, our developed code is validated by simulating theexperimentally-tested KSTAR ion-source configuration and semi-empirical equation.
Mechanics of single-walled carbon nanotubes inside open single-walled carbon nanocones
R. Ansari,M. Hosseinzadeh 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.11
This study investigates the mechanical characteristics of single-walled carbon nanotubes (CNTs) inside open single-walled carbon nanocones (CNCs). New semi-analytical expressions are presented to evaluate van der Waals (vdW) interactions between CNTs and open CNCs. Continuum approximation, along with the the Lennard-Jones (LJ) potential function, is used in this study. The effects of geometrical parameters on alterations in vdW potential energy and the interaction force are extensively examined for the concentric CNT-open CNC configuration. The CNT is assumed to enter the nanocone either through the small end or the wide end of the cone. The preferred position of the CNT with respect to the nanocone axis is fully investigated for various geometrical parameters. The optimum nanotube radius minimizing the total potential energy of the concentric configuration is determined for different radii of the small end of the cone. The examined configuration generates asymmetric oscillation; thus, the system constitutes a nano-oscillator.