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
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摘要: 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 nonlinear 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.Abstract: 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 nonlinear 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.
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