王坤
,
宋明涛
,
张金泉
,
盛丽娜
原子核物理评论
doi:10.11804/NuclPhysRev.31.01.032
研究设计了一种用于硼中子俘获治疗(BNCT)的紧凑型固定磁场交变梯度(FFAG)加速器。首先采用FFAG加速器磁铁的线性简化模型，计算确定了加速器的基本结构参数；再用WINAGILE程序进行了磁聚焦结构的设计和优化，得到了Beta函数、色散函数、包络函数及工作点等；采用MAD程序对设计结果进行了复算，并对两种程序的计算结果作了进一步的对比分析；最后采用ZGOUBI程序进行非线性磁场下粒子追踪。FFAG加速器的超周期为6，能量为11 MeV，场指数k为1.9，周长为11.1795 m，结构紧凑。分析结果表明，优化设计的FFAG加速器达到了预期的设计目标。
关键词:
FFAG
,
Lattice
,
硼中子
,
硼中子俘获治疗
Li'an HAN
材料科学技术（英文）
Lattice effect on magnetic and electrical transport properties of Ln2/3Pb1/3MnO3 (Ln=La, Pr, Nd) films prepared by RF magnetron sputtering technique were investigated. With the decrease of the average ions radius , the structure of Ln2/3Pb1/3MnO3 (Ln=La, Pr, Nd) targets transit from the rhombohedral phase to the orthorhombic phase, and the Curie temperature reduces rapidly with the decrease of . The electrical properties show that films are the metallic state which can be fitted to the formula: ρ(T)= ρ0+ρ1T2+ρ2T4.5 at low temperatures. The temperature range of the ferromagnetic metallic state becomes narrow with the decrease of . The phenomenon can be explained by the lattice effect.
关键词:
Lattice effect
,
films
,
Lattice
,
effect
,
Magn
