A new cooling and focusing device for ion guide
A new cooling and focusing device for ion guide
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一种新型离子导向冷却聚焦装置
DOI：
10.1016/0168-9002(93)91166-k
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发表时间：
1993
影响因子：
1.4
通讯作者：
S. Ohtani
中科院分区：
文献类型：
--
作者：
Hong;M. Wada;J. Tanaka;H. Kawakami;I. Katayama;S. Ohtani
为离子导在线同位素分离器（IGISOL）开发了一种使用射频多极场（六极离子束导引（SPIG））的高效聚焦装置。 SPIG 放置在喷嘴之后，由六个均匀分布在垂直于对称轴的平面内的圆上的圆杆组成。在棒产生的六极射频电场和氦气流的共同作用下，利用 SPIG 可以有效地传输低能量扩散的聚焦良好的离子束。使用放电离子源的实验结果表明，几乎90%离开喷嘴的离子可以通过SPIG传输，并且SPIG之后的动能分布宽度约为0.8 eV (FWHM)。这些实验结果与蒙特卡罗模拟的结果一致；模拟研究还表明，在SPIG末端，垂直于对称轴的平面内的空间分布尺寸直径小于1毫米。
A highly efficient focusing device which uses a RF multipole field (sextupole-ion-beam guide (SPIG)) has been developed for the ion guide isotope separator on-line (IGISOL). The SPIG, placed after the nozzle, consists of six circular rods uniformly distributed on a circle in the plane perpendicular to the axis of symmetry. Under the combined action of the sextupole RF electric field produced by the rods and helium gas flow, well focused ion beams with low energy spread can be transmitted efficiently by use of the SPIG. The experimental results, using a discharge ion source, show that almost nearly 90% of the ions which leave the nozzle can be transported through the SPIG, and that the width of the kinetic energy distribution after the SPIG is about 0.8 eV (FWHM). These experimental results agree with the results of Monte Carlo simulations; the simulation studies also indicate that the size of the spatial distribution in the plane perpendicular to the symmetry axis is less than 1 mm in diameter at the end of the SPIG.