中国原子能科学研究院紧凑型强流质子回旋加速器剥离引出技术研究

中国原子能科学研究院(CIAE)在20世纪90年代建造了一台30 MeV紧凑型强流质子回旋加速器后，经过近30年的发展，先后自主研发成功了基于剥离引出技术的能量为10 MeV、14 MeV、100 MeV、硼中子俘获治疗用14 MeV/1 mA等系列能量的紧凑型强流质子回旋加速器。建成的100 MeV紧凑型强流质子回旋加速器(CYCIAE-100)，是目前国际上能量较高的一台紧凑型强流质子回旋加速器，最高流强达到520 μA，束流功率达到52 kW。建成的硼中子俘获治疗用的质子回旋加速器，也是我国首次自主研发成功的引出质子束流强达到mA量级的强流质子回旋加速器。在系列能量的紧凑型强流质子回旋加速器研发过程中，CIAE对剥离引出后的束流色散效应、剥离膜与束流夹角对引出后的束流品质的影响、单圈剥离引出技术等紧凑型强流质子回旋加速器剥离引出技术等方面展开了研究，且自主开发出了剥离引出计算程序，为紧凑型强流质子回旋加速器的应用作出了贡献。

Stripping Extraction Technology Study on Compact High-intensity Proton Cyclotron of CIAE

The compact high-intensity proton cyclotron based on the stripping-extraction method has made great progress and obtained huge applications since the first cyclotron was applicated in 1932 in the world, especially in the field of nuclear medicine. China Institute of Atomic Energy (CIAE) built a 30 MeV compact high-intensity proton cyclotron in the 1990s in China and a series of compact high-intensity proton cyclotrons with energy of 10 MeV, 14 MeV, 100 MeV, 14 MeV/1 mA used in boron neutron capture therapy (BNCT) based on the stripping extraction technology have been developed. The 100 MeV compact high-intensity proton cyclotron (CYCIAE-100) built in 2014 is the largest compact high-intensity proton cyclotron with the higher energy in the world with a maximum current intensity of 520 μA and a beam power of 52 kW. The BNCT cyclotron is also the first high-intensity proton cyclotron with extracted beam reaching the mA level in China. A great progress on the stripping extraction technology used in cyclotrons has been achieved at CIAE during the 60 years development. The codes for stripping extraction studies, such as CYCTR, GOBLIN, STRIP-UBC and COMA, are developed by CIAE too. The study method with the code of GOBLIN for the beam dispersion effect in the stripping extraction cyclotrons was given in detail. The influence of the angle between the stripping foil and the beam to the quality of the extracted beam was analyzed in the paper. The single-turn stripping extraction technology for some special application was used in the stripping extraction cyclotrons. The stripping efficiency and the life of stripping foils were studied in the paper. The beam loss control in the stripping extraction field and stripping probe system were introduced in the end.