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Optimization and numerical simulation for the extraction system of the H^- multicusp ion source

Chinese Physics C 2014年第5期38卷 93-97页

作者： M.Hosseinzadeh H.Afarideh Nuclear Engineering and Physics Department Amirkabir University of Technology

A new ion source has been designed and manufactured for the CYCLONE30 accelerator, which has a much advanced performance compared with the original. It is expected that the newly designed ion source extraction system will transport a very large percentage of the beam without deteriorating the beam optics, which is designed to deliver an H- beam at 30 keV. The accelerator assembly consists of three circular aperture electrodes made of copper. The simulation study was focused on finding parameter sets that raise the beam perveance as large as possible and which reduce the beam divergence as low as possible. ion beams of the highest quality are extracted whenever the half-angular divergence is minimum, for which the perveance current intensity and the extraction gap have optimum values. The triode extraction system is designed and optimized by using CST software （for Particle Beam Simulations）. The physical design of the extraction system is given in this paper. From the simulation results, it is concluded that it is possible to achieve this goal by decreasing the thickness of the plasma electrode, shortening the first gap, and adjusting the acceleration electrode voltage.

关键词： multicusp ion source extraction electron tracking perveance angular divergence

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Development of H− multicusp ion source

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Radiation Detection Technology and Methods 2018年第1期2卷 186-189页

作者： M.Hoseinzade A.Nijatie Nuclear Engineering and Physics Department Amirkabir University of TechnologyTehran 15875-4413Iran Plasma Physics and Nuclear Fusion Research Department Nuclear Science and Technology Research InstituteAEOIPO Box 14155-1339TehranIran

Introduction The ion source is one of the key devices for the high-intensity cyclotron,which exerts influence on the beam intensity and applications of the *** paper will provide an introduction to current measures and present relevant experimental study as well as the beam test *** The existing ion source of the accelerator has a 2-mA output *** aim is to increase the current to roughly 5 mA to decrease the reaction time of ***,a new ion source was *** this end,some simulations were performed,and the simulated ion source was constructed,and then some measurements were *** and materials The CST code is used to simulate the chamber and extraction *** construction,some materials such as copper and stainless steel are *** wire of 2.1 mm diameter was developed to reach high beam *** and rotary pump is chosen for system *** cup can be used for *** magnets for plasma confinement are made of Nd–Fe–B *** The source assembly consists of a tubular plasma chamber(inner diameter:100 mm;length:150 mm)with 12 columns of permanent magnets(Nd–Fe–B material)to provide a stronger multicusp field,a three-electrode extraction system,and a top cover with a confinement magnet ***,5 mA H−beam can be extracted from the ion source with a plasma electrode aperture of 13 mm under an arc power of 6 *** optimum H2 gas flow rate and the change of pressure found during the tuning process of the ion source are presented.

关键词： multicusp ion source Extraction Electron tracking Perveance Angular divergence

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