Design of the IMP microbeam irradiation system for 100 MeV/u heavy ions

• Published in: Chinese physics C Vol. 33; no. 4; pp. 315 - 320
• Main Author: 盛丽娜 宋明涛 张小奇 杨晓天 高大庆 何源 张斌 刘杰 孙友梅 党秉荣 李文建 苏弘 满开第 郭艺珍 王志光 詹文龙
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.04.2009; Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou,730000,China; Graduate University of Chinese Academy of Sciences,Beijing,100049,China%Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou,730000,China
• Subjects: 辐照系统; 近代物理研究所; 进出口; 高能重离子; aberration; microbeam; high energy; ion beam optics
• ISSN: 1674-1137; 0254-3052; 2058-6132
• DOI: 10.1088/1674-1137/33/4/016

A state-of-the-art high energy heavy ion microbeam irradiation system is constructed at the Institute of Modern Physics of the Chinese Academy of Sciences. This microbeam system operates in both full current intensity mode and single ion mode. It delivers a predefined number of ions to pre-selected targets for research in biology and material science. The characteristic of this microbeam system is high energy and vertical irradiation. A quadrupole focusing system, in combination with a series of slits, has been designed to optimize the spatial resolution. A symmetrically achromatic system leads the beam downwards and serves simultaneously as an energy analyzer. A high gradient quadrupole triplet finally focuses a C^6＋ ion beam to 1 μm in the vacuum chamber within the energy range from 10 MeV/u to 100 MeV/u. In this paper, the IMP microbeam system is described in detail. A systematic investigation of the ion beam optics of this microbeam system is presented together with the associated aberrations. Comparison is made between the IMP microbeam system and the other existing systems to further discuss the performance of this microbeam. Then the optimized initial beam parameters are given for high resolution and high hitting efficiency. At last, the experiment platform is briefly introduced.