用RF地毯通过离子迁移分离原子和分子离子
Separation of atomic and molecular ions by ion mobility with an RF carpet
摘要：
充气停止室用于加速器实验室，用于高能放射性离子束的热化。许多停止单元的共同挑战是提取离子的高分子背景和由于空间电荷效应导致的提取效率的限制。在GSI的FRS离子捕集器中，开发了一种在将电离分子从停止池中提取出来之前将其去除的新技术。该技术利用RF地毯通过离子迁移率的差异将原子离子与分子污染物离子分离。给出了在600~MeV/u $^{124}$超导初级束流实验中成功实现和测试的结果。已经证明了三个数量级的分子污染物的抑制。已经实现了在25 u/e的质荷比范围内具有小于$1~\%$的背景事件的基本上无背景的测量条件。该技术还可用于减少在引出喷嘴和下游束线中的空间电荷效应，从而确保在无空间电荷条件下的高离子传输效率和高精度测量。
英文摘要：
Gas-filled stopping cells are used at accelerator laboratories for the thermalization of high-energy radioactive ion beams. Common challenges of many stopping cells are a high molecular background of extracted ions and limitations of extraction efficiency due to space-charge effects. At the FRS Ion Catcher at GSI, a new technique for removal of ionized molecules prior to their extraction out of the stopping cell has been developed. This technique utilizes the RF carpet for the separation of atomic ions from molecular contaminant ions through their difference in ion mobility. Results from the successful implementation and test during an experiment with a 600~MeV/u $^{124}$Xe primary beam are presented. Suppression of molecular contaminants by three orders of magnitude has been demonstrated. Essentially background-free measurement conditions with less than $1~\%$ of background events within a mass-to-charge range of 25 u/e have been achieved. The technique can also be used to reduce the space-charge effects at the extraction nozzle and in the downstream beamline, thus ensuring high efficiency of ion transport and highly-accurate measurements under space-charge-free conditions.
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