利用横向能量展谱仪(TESS)实验系统测量了光电阴极横向能量分布曲线(TEDCs)。

L B Jones, D P Juarez-Lopez, H E Scheibler, A S Terekhov, B L Militsyn, C P Welsch, T C Q Noakes
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引用次数: 1

摘要

电子加速器中可达到的最小粒子束发射度很大程度上取决于光电阴极电子源的本征发射度。这是可测量的,平均纵向和横向能量扩散在光发射电子束(MLE和MTE分别);因此,MLE和MTE是粒子加速器中用作电子源的光电阴极的显著优点。总的能量扩散由MTE和MLE的总和来定义,最小化MTE对于降低发射度从而产生高亮度电子束至关重要。在驱动自由电子激光器(FEL)的加速器中,减少电子束发射度可以显著减少x射线自由电子激光器的饱和长度,从而减少机器的结构占地面积和运行成本,同时增加x射线束亮度。测量从光电阴极发射的光电子的横向能量分布曲线的能力是光电阴极研究和开发的关键推动因素,这促使STFC达斯伯里实验室的加速器科学技术中心(ASTeC)开发了横向能量扩散光谱仪来进行这些关键的测量。我们详细介绍了升级后的TESS仪器的设计,并测量了铜(100)、(110)和(111)单晶光电阴极在266nm左右的紫外波长下照射的数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The measurement of photocathode transverse energy distribution curves (TEDCs) using the transverse energy spread spectrometer (TESS) experimental system.

The minimum achievable particle beam emittance in an electron accelerator depends strongly on the intrinsic emittance of the photocathode electron source. This is measurable as the mean longitudinal and transverse energy spreads in the photoemitted electron beam (MLE and MTE respectively); consequently, MLE and MTE are notable figures of merit for photocathodes used as electron sources in particle accelerators. The overall energy spread is defined by the sum of the MTE and the MLE, and the minimization of MTE is crucial to reduce emittance and thus generate a high-brightness electron beam. Reducing the electron beam emittance in an accelerator that drives a Free-Electron Laser (FEL) delivers a significant reduction in the saturation length for an x-ray FEL, thus reducing the machine's construction footprint and operating costs while increasing the x-ray beam brightness. The ability to measure the transverse energy distribution curve of photoelectrons emitted from a photocathode is a key enabler in photocathode research and development that has prompted the Accelerator Science and Technology Centre (ASTeC) at the STFC Daresbury Laboratory to develop the Transverse Energy Spread Spectrometer to make these crucial measurements. We present details of the design for the upgraded TESS instrument with measured data for copper (100), (110), and (111) single-crystal photocathodes illuminated at UV wavelengths around 266 nm.

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