Design considerations for a cycloidal mass analyzer using a focal plane array detector
Design considerations for a cycloidal mass analyzer using a focal plane array detector
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使用焦平面阵列探测器的摆线质量分析仪的设计注意事项
DOI：
10.1002/jms.4874
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发表时间：
2022
影响因子：
2.3
通讯作者：
Denton, M. Bonner
中科院分区：
文献类型：
--
作者：
Horvath, Kathleen L.;Piacentino, Elettra L.;Serpa, Rafael Bento;Aloui, Tanouir;Vyas, Raul;Zhilichev, Yuriy;von Windheim, Jesko;Sartorelli, Maria Luisa;Parker, Charles B.;Denton, M. Bonner
随着离子阵列探测器和高能永磁材料等技术的出现，摆线质量分析仪独特的聚焦特性及其实现小型、高分辨率和高灵敏度仪器的能力重新引起了人们的兴趣。然而，大多数文献处理摆线质分析仪的设计假设一个单通道检测器，因为在这些出版物的时间，兼容的多通道检测器是不可用的。本文介绍并讨论了摆线质谱分析仪与焦平面离子阵列探测器耦合设计的注意事项和程序。为了得到一组相关的设计考虑，我们首先回顾了摆线质量分析仪的独特聚焦特性，然后详细介绍了相对于离子源的焦平面阵列探测器的尺寸和位置如何决定摆线质量分析仪的可能质量范围和分辨率。我们提出了用于确定包含离子轨迹所需的均匀电场和磁场体积的推导和计算，并使用有限元分析（FEA）模拟探索电场和磁场均匀性与分辨率之间的关系。通过对78种不同的有限元模型的均匀性值进行拟合，建立了电场均匀性与电极几何形状的关系式。最后，提出了采用阵列检测器设计摆线质谱分析仪的步骤。
With the advent of technologies such as ion array detectors and high energy permanent magnet materials, there is renewed interest in the unique focusing properties of the cycloidal mass analyzer and its ability to enable small, high‐resolution, and high‐sensitivity instruments. However, most literature dealing with the design of cycloidal mass analyzers assumes a single channel detector because at the time of those publications, compatible multichannel detectors were not available. This manuscript introduces and discusses considerations and a procedure for designing cycloidal mass analyzers coupled with focal plane ion array detectors. To arrive at a set of relevant design considerations, we first review the unique focusing properties of the cycloidal mass analyzer and then present calculations detailing how the dimensions and position of the focal plane array detector relative to the ion source determine the possible mass ranges and resolutions of a cycloidal mass analyzer. We present derivations and calculations used to determine the volume of homogeneous electric and magnetic fields needed to contain the ion trajectories and explore the relationship between electric and magnetic field homogeneity on resolving power using finite element analysis (FEA) simulations. A set of equations relating the electric field homogeneity to the geometry of the electric sector electrodes was developed by fitting homogeneity values from 78 different FEA models. Finally, a sequence of steps is suggested for designing a cycloidal mass analyzer employing an array detector.