It is an important research subject for the spaceflight countries to conduct equivalent simulation of 5eV atomic oxygen effects for the spaceflight material in low earth orbit.This paper introduces an apparatus used f...It is an important research subject for the spaceflight countries to conduct equivalent simulation of 5eV atomic oxygen effects for the spaceflight material in low earth orbit.This paper introduces an apparatus used for producing atomic oxygen,which consists of a PIG ion source with permanent magnet,two electrodes extraction system, an electron deflector,an einzel lens,an ion decelerating electrode and a sample bracket.At present it has been used on the small debris accelerator in the Center for Space Science and Applied Research,Chinese Academy of Sciences, and the producing experiments of O^- are carried out.200—300μA of O^- ions are extracted at the extraction voltage of 2—3kV.The experiments for decelerating of O^- ions and erosion of kapton foil are carried out also.Because of the target room used for both the atomic oxygen device and the small debris accelerator,the facility can be used for small debris impinging and atomic erosion for spaceflight materials simultaneouslly.展开更多
In this paper, we focus on a PIG source for producing intense H-ions inside a 9 MeV cyclotron. The properties of the PIG ion source were simulated for a variety of electric field distributions and magnetic field stren...In this paper, we focus on a PIG source for producing intense H-ions inside a 9 MeV cyclotron. The properties of the PIG ion source were simulated for a variety of electric field distributions and magnetic field strengths using a CST particle studio. After analyzing the secondary electron emission（SEE） as a function of both magnetic and electric field strengths, we found that for the modeled PIG geometry, a magnetic field strength of 0.2 T provided the best results in terms of the number of secondary electrons. Furthermore, at 0.2 T, the number of secondary electrons proved to be greatest regardless of the cathode potential. Also, the modified PIG ion source with quartz insulation tubes was tested in a KIRAMS-13 cyclotron by varying the gas flow rate and arc current, respectively.The capacity of the designed ion source was also demonstrated by producing plasma inside the constructed 9 MeV cyclotron. As a result, the ion source is verified as being capable of producing an intense H-beam and high ion beam current for the desired 9 MeV cyclotron. The simulation results provide experimental constraints for optimizing the strength of the plasma and final ion beam current at a target inside a cyclotron.展开更多
文摘It is an important research subject for the spaceflight countries to conduct equivalent simulation of 5eV atomic oxygen effects for the spaceflight material in low earth orbit.This paper introduces an apparatus used for producing atomic oxygen,which consists of a PIG ion source with permanent magnet,two electrodes extraction system, an electron deflector,an einzel lens,an ion decelerating electrode and a sample bracket.At present it has been used on the small debris accelerator in the Center for Space Science and Applied Research,Chinese Academy of Sciences, and the producing experiments of O^- are carried out.200—300μA of O^- ions are extracted at the extraction voltage of 2—3kV.The experiments for decelerating of O^- ions and erosion of kapton foil are carried out also.Because of the target room used for both the atomic oxygen device and the small debris accelerator,the facility can be used for small debris impinging and atomic erosion for spaceflight materials simultaneouslly.
基金supported by the Korea Evaluation Institute of Industrial Technology(KEIT)funded by the Ministry of Trade,Industry & Energy(10043897,Development of 500 cGy level radiation the rapy system based on automatic detection and tracing technology with dualhead gantry for 30% reducing treatment for cancer tumors)
文摘In this paper, we focus on a PIG source for producing intense H-ions inside a 9 MeV cyclotron. The properties of the PIG ion source were simulated for a variety of electric field distributions and magnetic field strengths using a CST particle studio. After analyzing the secondary electron emission（SEE） as a function of both magnetic and electric field strengths, we found that for the modeled PIG geometry, a magnetic field strength of 0.2 T provided the best results in terms of the number of secondary electrons. Furthermore, at 0.2 T, the number of secondary electrons proved to be greatest regardless of the cathode potential. Also, the modified PIG ion source with quartz insulation tubes was tested in a KIRAMS-13 cyclotron by varying the gas flow rate and arc current, respectively.The capacity of the designed ion source was also demonstrated by producing plasma inside the constructed 9 MeV cyclotron. As a result, the ion source is verified as being capable of producing an intense H-beam and high ion beam current for the desired 9 MeV cyclotron. The simulation results provide experimental constraints for optimizing the strength of the plasma and final ion beam current at a target inside a cyclotron.
