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 ...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.展开更多
本文介绍在建的中国先进研究堆(China Advanced Research Reactor,CARR)上的在线同位素分离器的三种离子源的原理、结构特点、实验结果。这三种不同的离子源是针对不同的放射性同位素,为了获取理想的束流而研制的。这三种离子源分别是...本文介绍在建的中国先进研究堆(China Advanced Research Reactor,CARR)上的在线同位素分离器的三种离子源的原理、结构特点、实验结果。这三种不同的离子源是针对不同的放射性同位素,为了获取理想的束流而研制的。这三种离子源分别是高温表面热电离离子源、弧放电离子源、边引出型潘宁源。其中高温表面热电离离子源内的钨电离器内的温度已达到2400℃,为我们研究难电离的稀土元素提供了保证。展开更多
A Penning ion gauge （PIG）-type ion source has been used for the generation of negative hydrogen ions （H-） as the internal ion source of the compact cyclotron. The discharge characteristics of the ion source are sy...A Penning ion gauge （PIG）-type ion source has been used for the generation of negative hydrogen ions （H-） as the internal ion source of the compact cyclotron. The discharge characteristics of the ion source are systematically studied for hydrogen operation at different discharge currents and gas flow rates on the prototype cyclotron. The preliminary study results for the low DC voltage H- extraction measurements are presented in this paper. The H- beam current is measured by the order of magnitude from several tens to hundreds of microamperes at different parameter conditions. The discussion and analysis for the experimental results are good for improving the design and working stability of the ion source.展开更多
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 machine.This paper will provide an introduction to current me...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 machine.This paper will provide an introduction to current measures and present relevant experimental study as well as the beam test results.Purpose The existing ion source of the accelerator has a 2-mA output current.Our aim is to increase the current to roughly 5 mA to decrease the reaction time of cyclotron.Therefore,a new ion source was developed.To this end,some simulations were performed,and the simulated ion source was constructed,and then some measurements were noted.Methods and materials The CST code is used to simulate the chamber and extraction system.For construction,some materials such as copper and stainless steel are used.Tungsten wire of 2.1 mm diameter was developed to reach high beam current.Turbo and rotary pump is chosen for system evacuation.Faraday cup can be used for readout.The magnets for plasma confinement are made of Nd–Fe–B material.Results 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 inside.Now,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 kW.The optimum H2 gas flow rate and the change of pressure found during the tuning process of the ion source are presented.展开更多
文摘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.
文摘本文介绍在建的中国先进研究堆(China Advanced Research Reactor,CARR)上的在线同位素分离器的三种离子源的原理、结构特点、实验结果。这三种不同的离子源是针对不同的放射性同位素,为了获取理想的束流而研制的。这三种离子源分别是高温表面热电离离子源、弧放电离子源、边引出型潘宁源。其中高温表面热电离离子源内的钨电离器内的温度已达到2400℃,为我们研究难电离的稀土元素提供了保证。
基金supported by Military-Civilian Technology Development of CAEP (JM200701)
文摘A Penning ion gauge （PIG）-type ion source has been used for the generation of negative hydrogen ions （H-） as the internal ion source of the compact cyclotron. The discharge characteristics of the ion source are systematically studied for hydrogen operation at different discharge currents and gas flow rates on the prototype cyclotron. The preliminary study results for the low DC voltage H- extraction measurements are presented in this paper. The H- beam current is measured by the order of magnitude from several tens to hundreds of microamperes at different parameter conditions. The discussion and analysis for the experimental results are good for improving the design and working stability of the ion source.
文摘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 machine.This paper will provide an introduction to current measures and present relevant experimental study as well as the beam test results.Purpose The existing ion source of the accelerator has a 2-mA output current.Our aim is to increase the current to roughly 5 mA to decrease the reaction time of cyclotron.Therefore,a new ion source was developed.To this end,some simulations were performed,and the simulated ion source was constructed,and then some measurements were noted.Methods and materials The CST code is used to simulate the chamber and extraction system.For construction,some materials such as copper and stainless steel are used.Tungsten wire of 2.1 mm diameter was developed to reach high beam current.Turbo and rotary pump is chosen for system evacuation.Faraday cup can be used for readout.The magnets for plasma confinement are made of Nd–Fe–B material.Results 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 inside.Now,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 kW.The optimum H2 gas flow rate and the change of pressure found during the tuning process of the ion source are presented.
