用0.5 MV端电压的串列AMS装置开展<sup>10</sup>Be测量方法研究

用0.5 MV端电压的串列AMS装置开展¹⁰Be测量方法研究

摘要: 本文通过对¹⁰Be离子在加速器质谱计（CAMS）高能端束流传输进行模拟计算，确定了¹⁰Be离子束流传输的优化设计。设计安装了测量⁹Be束流的法拉第筒、能量吸收膜（SiN膜）装置、ΔE-E_res气体探测器等，结果表明，改进后的CAMS可进行¹⁰Be测量，¹⁰Be测量总传输效率约为2%，测量本底约为4×10^-14。

Abstract: Firstly ion optics calculations for the transport of ¹⁰Be were performed for the high energy system. Then a new Faraday cup was installed to measure high energy 9Be current and holder for silicon nitride foil (SiN-foil) was mounted. For the detection the Si-detector at the end of the beam line was replaced with a high resolution ΔE-E_res gas ionization chamber. The results show that the overall transmission efficency is about 2% and the ¹⁰Be background level is limited to 4×10^-14.