Extraction efficiency and extraction time of the SHIPTRAP gas-filled stopping cell
Extraction efficiency and extraction time of the SHIPTRAP gas-filled stopping cell
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DOI：
10.1016/j.nimb.2007.01.291
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发表时间：
2007-05-01
影响因子：
1.3
通讯作者：
Wang, Z.
中科院分区：
文献类型：
--
作者：
Eliseev, S. A.;Block, M.;Wang, Z.
的提取效率和提取时间的SHIPTRAP充气停止细胞进行了测量和停止离子提取过程中发生的化学过程进行了研究。测量使用Rn-219反冲离子从α衰变的校准点样Ra-223离子源。在气室中氦气压力为40 mbar时，测得的提取时间短于10 ms。因此，对于SHIPTRAP计划进行的各种精密实验，可以获得半衰期为几毫秒的核素。在50毫巴的氦气压力下获得高达30%的提取效率。从计算的停止和测量的提取效率的乘积导出的气室的估计的总效率总计为约10%。定量地了解限制效率的因素。在标准操作条件下，气体电池中的离子分子反应似乎不会显著限制气体电池的效率。(c)2007 Elsevier B.V.保留所有权利。
The extraction efficiency and extraction time of the SHIPTRAP gas-filled stopping cell were measured and chemical processes occurring during extraction of the stopped ions were investigated. The measurements were performed using Rn-219 recoil ions from the alpha-decay of a calibrated point-like Ra-223 ion source. The extraction time was measured to be shorter than 10 ms at a helium gas pressure in the gas cell of 40 mbar. Thus, nuclides with half-lives on the order of a few milliseconds are accessible for the various precision experiments planned at SHIPTRAP. Extraction efficiencies of up to 30% were obtained at a helium pressure of 50 mbar. The estimated total efficiency of the gas cell, derived from the product of calculated stopping and measured extraction efficiency, amounts to about 10%. Factors limiting the efficiency are quantitatively understood. Under standard operating conditions, ion molecule reactions in the gas cell do not seem to limit the efficiency of the gas cell significantly. (c) 2007 Elsevier B.V. All rights reserved.