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相关概念视频

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

550
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
550
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

876
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called collision-induced...
876

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Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
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混合增益探测器配置用于时间解析的X射线溶液散射.

Morten Lunn Haubro1, Joseph Pon2, Philip Adam Hart3

  • 1Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.

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概括

用混合增益模式配置X射线探测器为X射线自由电子激光实验提供了优势. 这种方法可以提高动态范围和信号噪声比率,而无需复杂的自动范围,从而提高分散技术的数据质量.

关键词:
在XFELEL中,探测器 探测器 探测器 探测器检测器的非线性性.扩散散的散射是一种分散的散射.收益切换转换 收益切换

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科学领域:

  • 射线科学与技术X射线科学与技术
  • 探测器物理和仪器仪表.

背景情况:

  • 射线自由电子激光器 (XFEL) 产生强烈的短脉冲,这给检测带来了挑战.
  • 自放大自发发射 (SASE) 的巨大波动使实验测量变得复杂.
  • 在Linac连贯光源 (LCLS) 的Epix10ka2M探测器使用多个增强模式和自动范围来管理动态范围和噪声.

研究的目的:

  • 研究在X射线探测器上使用不同增益模式的固定混合用于扩散散射技术的可行性.
  • 评估混合增强模式对探测器线性,动态范围和信号噪声比的影响.
  • 开发混合增益模式的最佳配置方案,以最大限度地降低和,最大限度地提高信号检测.

主要方法:

  • 在 ePix10ka2M 探测器内配置单个特定应用程序集成电路 (ASIC),以单独增强模式.
  • 在不同的增强模式配置中分析了增强响应的强度线性.
  • 在混合增益模式条件下评估了有效的动态范围和信号噪声比.

主要成果:

  • 将ASIC配置为单独增益模式并没有显著影响强度线性.
  • 混合增益模式在具有不同增益设置的区域对有效动态范围的影响有限.
  • 当同一ASIC上的像素处于不同的增强模式时,观察到很小的非线性增强贡献 (<5%).

结论:

  • 不同增强模式的固定组合提供了类似于XFEL中扩散散散技术的自动范围的优势.
  • 这种混合增益配置方案将高/中增益区域的和度降至最低,同时最大限度地增加具有更高增益的像素.
  • 拟议的配置方案改善了信号与噪声的比率,并与自动测距相比简化了探测器操作.