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Radioactive Ion Beam Generation And Related Physical And Technical Issues

Posted on:2005-09-15Degree:DoctorType:Dissertation
Country:ChinaCandidate:B Q CuiFull Text:PDF
GTID:1112360152956569Subject:Nuclear technology and applications
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In recent years, radioactive ion beam facilities have been built or propos led in many national laboratories world-wide. With radioactive ion beam, researches on new isotope synthesis will open new area for exotic nuclide research; research on nuclear structure is extended from nearby area of drop line to area of far from nuclear drop line, which will reveal many new information on experimental and theoretical research; research on astrophysics will provide us essential data on cosmic evolution and formation. Since pure radioactive ion beam can be implanted into material directly, research on solid physics especially on impurity and defect in semiconductor become possible. Also research on treatment and diagnose of patient is in progress.To meet such great amount of needs from physics world, a radioactive ion beam facility has been scheduled in China Institute of Atomic Energy. The facility will consists of a new lOOMeV, 200uA cyclotron and a new isotope separator on line (ISOL) which will sever as injector of HI-13 tandem. ISOL is a complicated system which involves nuclear reaction, diffusion and effusion, high temperature, ionization, isobar separation and very low intensity ion beam diagnose. So far no systemic investigation on such system has ever been carried out. Therefore investigation on such technologies is urgent and meaningful for the development of new RIB facility in our country. In this thesis, an ISOL apparatus based on HI-13 tandem, its performance and related technologies will be introduced.related to RIB generation deployed in this facility is introduced. Also the brief overview of RIB facility in CIAE is presented.In chapter II, the RIB apparatus based on HI?3 tandem is expatiated. The emphases are on the development of target-ion source. The target ion source developed in CIAE couples the target and ion source tightly together; it has the ability to run above 1500 Celsius degree, operated in radioactive environment and adequate configuration for rapid disassembly and easy maintenance. Also the off-line characteristic of the system including the overall efficiency of the system is presented.In chapter III, the development of target material is presented. Also the general method for target development is summarized. The target has to fulfill following criterions: high cross section to produce required radioactive nuclide; stable chemical property and low vapor pressure in high temperature; in proper form for rapid release of radioactive species. A unique copper target design for production of radioactive 62Zn is presented and it thermal property is tested.In chapter IV, the detail of a unit for RIB measurement and distinguish with low energy and very low beam intensity is introduced. The system consists of movable metal tape, HPGe detector and control unit. Also its on-line test result is presented and discussed.In chapter V, the on-line performance of the RIB system is characterized. Also the method of system tuning is presented. With 25MeV, luA proton beam, a 25keV 62Zn radioactive ion beam with a intensity greater than 106 pps is delivered to experimental sample. Research on nano-material has been carried out successfully with generated RIB as nuclear probe.In conclusion, a RIB apparatus based on tandem has been developed in CIAE. Some key technology such as target/ion source, target preparation, diagnostic technology of RIB with low energy and low beam intensity which is crucial to our new RIB facility are explored. For the first time, the 25keV 62Zn radioactive ion beam with a intensity greater than 106 pps is delivered to experimental nano-material sample to perform solid material research successfully.
Keywords/Search Tags:radioactive ion beam, target/ion source, target material, 62Zn, beam diagnose
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