CSRe电子冷却模式下核质量测量研究

Study of Nuclear Mass Measurement by Electron Cooling Mode in CSRe

研究了CSRe电子冷却模式下使用线性质量刻度时,空间电荷效应对测量精度的影响、CSRe上测量190Ir质量的实验可行性以及估算了电子冷却模式下,使用非线性刻度法所能达到的测量精度。理论上的分析表明,CSRe在束流和二极铁磁场稳定的理想情况下,如果电子冷却对同种离子束的冷却效果能达到δp/p=10-6量级,采用非线性刻度的方法,能够对像190Ir这样的重离子达到σ(m)/m≈10-8的测量精度。

Nuclear mass measurement by electron cooling mode in CSRe is discussed, mainly in three related aspects： the systematic error caused by the space charge effect in the case of linear mass calibration; the possibility of mass measurement of ^190 Ir in CSRe; the estimation of the attainable precision in the case of non-linear mass calibration. Theoretic analysis of the attainable precision shows that a precision of σ（m）/m≈10^-8 can be achieved if the momentum spread of each kind of ions can be reduced to 10^-6 in CSRe.