热离子发生器作为离子捕集器的研制
Development of a thermal ionizer as ion catcher
摘要：
有效的离子捕集器是基于飞行中生产的放射性核束设施的重要组成部分。捕捉器阻止快速放射性产物，并将其作为单电荷慢离子发射。目前的离子捕集器基于停止在He和H $_2$气体中。然而，随着二次射束强度的增加，所产生的离子-电子对的量最终阻止了放射性离子从气室的电磁提取。相比之下，在与ISOL生产技术一起使用的热电离器中不存在这样的限制。因此，至少对于碱金属和碱土金属元素，热电离器应当是优选的。TRI $μ$ P设施的一个重要用途是使用原子阱进行精确测量。原子俘获对于碱金属和碱土金属同位素特别可能。该设施可以用飞行中方法生产多达10种不同Na同位素的$^9$ $^{-1}$。因此，我们已经建立并测试了一个热离子发生器。TRI $μ$ P热离子发生器的操作、设计、构造和调试概述将与$^{20}$ Na和$^{21}$ Na的初步结果一起介绍。
英文摘要：
An effective ion catcher is an important part of a radioactive beam facility that is based on in-flight production. The catcher stops fast radioactive products and emits them as singly charged slow ions. Current ion catchers are based on stopping in He and H$_2$ gas. However, with increasing intensity of the secondary beam the amount of ion-electron pairs created eventually prevents the electromagnetic extraction of the radioactive ions from the gas cell. In contrast, such limitations are not present in thermal ionizers used with the ISOL production technique. Therefore, at least for alkaline and alkaline earth elements, a thermal ionizer should then be preferred. An important use of the TRI$μ$P facility will be for precision measurements using atom traps. Atom trapping is particularly possible for alkaline and alkaline earth isotopes. The facility can produce up to 10$^9$ s$^{-1}$ of various Na isotopes with the in-flight method. Therefore, we have built and tested a thermal ionizer. An overview of the operation, design, construction, and commissioning of the thermal ionizer for TRI$μ$P will be presented along with first results for $^{20}$Na and $^{21}$Na.
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