CSRe储存环等时性模式转变能洛伦兹因子曲线的测量与校正

综述了兰州冷却储存环CSRe上转变能洛伦兹因子的测量与校正的最新进展，详细阐述了基于等时性质谱仪实验数据测量储存环的转变能洛伦兹因子的方法，以及利用CSRe二极、四极、六极磁铁校正转变能洛伦兹因子曲线的结果。实验结果表明，二极磁铁和四极磁铁可以平移转变能洛伦兹因子曲线，六极磁铁可以旋转转变能洛伦兹因子曲线。通过校正CSRe的转变能洛伦兹因子曲线，将CSRe对目标离子的质量分辨能力R=m/△m=3.15（9）×104（FWHM）（回旋周期相对误差σT/T=7.3（2）×10-6）提高到1.72（4）×105（FWHM）（σT/T=1.34（3）×10-6）。

Measurements and Corrections of the Lorentz Factor of Transition Energy of the CSRe Storage Ring in the Isochronous Mode

The latest developments of measurements and corrections of the transition energy of the cooling storage ring CSRe at the Lanzhou are reviewed in this paper. The principle of the method used to measure the transition energy of the storage ring CSRe is introduced. This method was used to investigate the influence of dipole magnetic fields, quadrupole magnetic fields and sextupole magnetic fields on the transition energy curve. Experimental results show that the transition energy curve can be horizontally, vertically shifted as well as rotated, by varying dipole magnetic fields, quadrupole magnetic fields and sextupole magnetic fields, respectively. With the corrections of the quadrupole magnets and sextupole magnets at the CSRe, the mass resolving power R for the target nuclei was improved from R=3.15(9)×104 (relative error of revolution time σT/T=7.3(2)×10-6) to 1.72(4)×105 (σT/T=1.34(3)×10-6).