CSR ns级重离子束动力学研究

Dynamics Study of Attaining Heavy Ion Beam With a Scale of Nanosecond Pulse Length in CSR

摘要: 采用束团在纵向相空间快速旋转的非绝热压缩方法研究了在兰州重离子加速器冷却储存环（HIRFL-CSR）上获取高能ns量级短脉冲重离子束的可行性，利用K-V包络方程对能量为250 MeV/u、初始纵向束团长度为200 ns、初始动量分散为5×10^-4的²³⁸U⁷²⁺离子束团的非绝热压缩过程进行了束流动力学模拟，给出了在束团压缩过程中束流相关参数的变化。结果表明，在CSR上可取得最短为16 ns长度的²³⁸U⁷²⁺离子束团，可满足用于高能量密度物理研究的50 ns束团长度的要求。

Abstract: The feasibility of attaining short pulse duration heavy ion beam with a scale of nanosecond pulse length was studied in the Heavy Ion Research Facility in Lanzhou—Cooling Storage Ring (HIRFL-CSR), such heavy ion beam can be produced by non-adiabatic compression, and it is implemented by a fast rotation in the longitudinal phase space. In this paper, the bunch compression beam dynamics of ²³⁸U⁷²⁺ which the energy is 250 MeV/u, initial bunch pulse duration is 200 ns, and the initial momentum spread is 5×10^-4 was computed with K-V envelope model, and the possible beam parameters are presented during bunch compression. The short ²³⁸U⁷²⁺ bunch of 16 ns is got which can satisfy with the research of high energy density physics.