单粒子微束辐照装置的束流光学计算  

Beam optics simulation for the single-ion microbeam facility at Fudan University

作　　者：柳岸[1] 王旭飞[1] 李嘉庆[1] 张杰雄[1] 王建中[1] 何志江[1] 张伟[1] 张斌[1] 施立群[1] 邵春林[2] 

机构地区：[1]复旦大学核科学与技术系现代物理研究所离子束应用物理教育部重点实验室,上海200433 [2]复旦大学放射医学研究所,上海200032

出　　处：《核技术》2011年第3期169-174,共6页Nuclear Techniques

基　　金：国家自然科学基金青年科学基金(11005019);上海市重点学科建设项目(B107)资助

摘　　要：利用束流光学计算程序TRANSPORT和TURTLE对基于2×3MV串列静电加速器的单粒子微束细胞精确照射装置的束流传输光学进行了一阶近似计算,得到了包括束流包络、束流相图、束斑大小及束流发散程度的相关数据。计算结果表明,对于能量1.5MeV,经2mm×2mm狭缝入射且初始发散角x'～y'≤3mrad的典型质子束流,通过优化光学元件的参数,在束线末端可获得束径x<0.2cm,y<0.3cm,发散角x'<4.8mrad,y'<6.5mrad的准平行束流,达到了微准直器获取单粒子微束所需的束流品质。计算结果为束线系统优化和束流调试工作提供了必要的参考依据。A first-order simulation is performed on beam optics of the Fudan single-ion microbeam facility, which is designed to irradiate individual living cells at highly localized spatial region with accurately controlled dose. A typical proton beam of 1.5 MeV for routine experiments is simulated. The results of the transporting beam envelope and the beam profile, the phase space and the divergence angles at the end of the beam line show good status （x〈0.2 cm, y〈0.3 cm; x^2〈4.8 mrad, y^2〈6.5 mrad ） for extracting a collimated microbeam. Concerning the possible influences of space charge effects, 1.5 MeV protons with a beam current up to 7 mA （far higher than common value） is also calculated, the beam size at the end of the beam line can still be focused within 0.6 cm in diameter, with the divergence angles below 6.5 mrad. The results are still good enough for the requirements of a collimated microbeam throueh the carfillarv collimator.

关 键 词：微束 单粒子 束流光学 TRANSPORT TURTLE 

分 类 号：TL501.5[核科学技术—核技术及应用]