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A novel electrostatic lens module in carbon nanotube field-emission electron guns for energy-variable X-ray sources

机译:碳纳米管场发射电子枪中用于能量可变X射线源的新型静电透镜模块

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We have designed and fabricated a novel electrostatic lens module composed of a micro- and macro-focusing lens in carbon nanotube field-emission electron guns for energy-variable X-ray sources maintaining their focal spot size. The effective focal spot was observed to be small and isotropic by the micro-focusing lens to suppress the divergence of an individual electron beam and the elliptical macro-focusing lens to guide a circular focal spot through the tilted anode target. We could retain a constant focal spot under various anode voltages by changing the bias voltages applied to the electrostatic lens.
机译:我们设计并制造了一种新型的静电透镜模块,该模块由碳纳米管场发射电子枪中的微距和微距聚焦透镜组成,用于能量可变的X射线源,可保持其焦点大小。通过微聚焦透镜可观察到有效焦点很小且各向同性,以抑制单个电子束的发散,而椭圆形微距聚焦透镜可通过倾斜的阳极靶引导圆形焦点。通过改变施加到静电透镜上的偏置电压,我们可以在各种阳极电压下保持恒定的焦点。

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