Production Of High-intensity Highly Charged Ions And Studies On An Electrostatic Ion Trap

Production of high-intensity highly charged ions is indispensable in the develop-ment of modern heavy-ion accelerators.It is essential for the research such as atomic and nuclear physics.To achieve high-intensity highly charged refractory metal ions,a new structure of micro oven working at high temperature has been successfully made.Aiming at the production of pulsed highly charged ion beams,a new ion trap concept is proposed.Through theoretical analysis,simulations and construction of a prototype,the feasibility of the concept is verified.Aiming at the research in new technology,new principle and new structure of pro-duction of high-intensity highly charged ion beams,this thesis consists of two parts:(1)Development of new technology to produce refractory metal ions.The structure of a high temperature oven needs to be specially designed for the following reasons:1)Maximize the capacity of the crucible in the limited space of ECR ion sources.2)Lifetime,economy and reliability of the oven under strong electromagnetic force.A new design concept of a resistive heating oven is proposed in this study.The crucible of the high temperature oven will be made of ceramic instead of metal.The temperature of the oven reaches over 1800℃ with a commercial heating coil.Off-line tests show the stability of this high temperature oven.(2)Design of a high-intensity highly charged ion trap.Convert the extracted direct current ion beams from a highly charged ECR ion source into high-intensity short-pulsed highly charged ion beams.A new conceptual design and prototype ITRIP(Ion TRap for high Intensity Pulsed beams)for the production of high-intensity pulsed ion beams based on ion trap is proposed.After compression and accumulation of the extracted ions from an ECR ion source,the ions from the ion trap will be extracted in a short time.The peak intensity of the extracted ion beams is expected to be several times higher.This thesis proposes a new conception of ITRIP.The theoretical analysis and simulations show the feasibility and the performance of ITRIP is predicted.The prototype of Po P(Proof of Principle)is designed and set up.The primary tests have been done.Based on the goal of confinement for the certain charge state of ions,using simulation to compare the characteristics of different kinds of electron guns and achieve the designed param-eters and structure of the trap.The original idea of the bunching section is introduced into the trap.Using traveling potential waves to compress the ions and dump the ions into the trapping section.The trapping efficiency of ions is calculated and the trapping process of ions is thoroughly analyzed based on the simulations.Precise timing of the pulsed power supplies is achieved with the Po P platform and the experimental results show the feasibility of the bunching section.The experiments of accumulation and ex-traction of O and Ar ions show that the designed ion trap can effectively make the ion confinement and accumulation.Limited by the vacuum condition,the structure of ITRIP,and the performance of the ECR ion source used for this Po P test,the experiments related to the production of high charge state pulsed ion beams has not been done.There are still much work to be made in the future to further optimize the performance of the device as discussed herein.