Life with MC-SNICS. Part II: Further ion source development at the Keck carbon cycle AMS facility
Life with MC-SNICS. Part II: Further ion source development at the Keck carbon cycle AMS facility
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DOI：
10.1016/j.nimb.2007.01.147
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发表时间：
2007-06-01
影响因子：
1.3
通讯作者：
Santos, Guaciara M.
中科院分区：
文献类型：
--
作者：
Southon, John;Santos, Guaciara M.
我们报告正在进行的国家静电（NEC）MC-SNICS离子源在加州大学欧文分校的KCCAMS实验室的改进计划。最近的工作集中在真空的改善和增加源输出和效率。我们更换了萃取器和预加速组件，使泵送电导提高了三倍，从而降低了源压力，并在更换样品轮后加快了启动速度。切换到球形离子发生器引起铯束聚焦的显著改善，导致离子源效率和负离子束质量的重大增益。在新的离子发生器组件内更好地限制Cs导致更低的Cs消耗和电弧问题的显著减少。(c)2007 Elsevier B. V.保留所有权利。
We report on an ongoing program of improvements to the National Electrostatics (NEC) MC-SNICS ion source at the KCCAMS laboratory at UC Irvine. Recent work has focused on vacuum improvements and on increasing the source output and efficiency. We replaced the extractor and preacceleration assemblies for a threefold improvement in pumping conductance, leading to lower source pressures and quicker startup after sample wheel changes. A switch to spherical ionizers caused a marked improvement in the focusing of the Cs beam, leading to major gains in ion source efficiency and negative ion beam quality. Better confinement of Cs within the new ionizer assembly resulted in lower Cs consumption and a significant reduction in arcing problems. (c) 2007 Elsevier B.V. All rights reserved.