Experimental Materials Research for Photoelectron Sources

光电子源实验材料研究

• 批准号: 2113652
• 金额: --
• 依托单位: University of Liverpool
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2113652
• 关键词: Experimental; Materials; Research; Photoelectron; Sources

This project will focus on the fabrication and testing of metal-semiconductor materials for photocathode applications, to identify materials and preparation techniques that optimise material performance. The project has two strands to the research programme, using; - laboratory-based instrumentation to prepare, fabricate and characterise materials suitable for photocathodes, including the commissioning of a new deposition system to growth thin alkali antimonide/telluride layers. - existing metal photocathode preparation facility and the new growth system to produce cathodes for testing in the VELA electron injector, using the extensive suite of machine diagnostics to measure transverse and longitudinal beam properties. The student will join ASTeC's Accelerator Physics group at Daresbury National Laboratory for the duration of the research. This project is an extension of previous research undertaken in ASTeC which led to significant results both in electrostatic modelling of the Transverse Energy Spread Spectrometer (TESS) and measurement of transverse and longitudinal energy distributions of photocathode materials. In the first year of the project the student will familiarise themselves with the existing surface analysis equipment and contribute to the commissioning of the new alkali antimonide/telluride growth facility. Complementary data will also be collected using the TESS instrument. In the latter part of the project photocathodes will be produced for testing in the VELA accelerator with pre- and post-testing characterisation. In-accelerator testing will be carried out using the existing suite of diagnostics, including the spectrometer line for measuring energy and energy spread, quad scans for emittance measurements and the transverse deflecting cavity for bunch length (and hence response time) characterisation. The proposed project has the capacity to generate considerable impact. The data generated will provide invaluable input to support VELA/CLARA accelerator operations, in particular contributing to the establishment of stable and reliable operating conditions. In addition, the results will contribute to the on-going specification of the electron injector for the proposed UK XFEL and FCC prototype, developing the expertise and reducing the risk associated with this critical sub-system of the accelerator. Ultimately, the work will contribute to the ongoing international effort to understand and improve photocathode performance, which is important for both FEL applications and High Energy Physics machines.

该项目将专注于光电阴极用金属半导体材料的制造和测试，以确定优化材料性能的材料和制备技术。该项目的研究方案有两个方面：-使用实验室仪器来制备、制造和表征适用于光电阴极的材料，包括试运行一种新的沉积系统以生长薄的碱性锑化物/碲化物层。-现有的金属光电阴极制备设施和新的生长系统，以生产用于在VELA电子注入器中测试的阴极，使用广泛的机器诊断套件来测量横向和纵向束流特性。这名学生将在研究期间加入ASTEC在达累斯伯里国家实验室的加速器物理小组。该项目是ASTEC先前研究的延伸，该研究在横向能散谱仪(TESS)的静电建模和测量光电阴极材料的横向和纵向能量分布方面都取得了重大成果。在项目的第一年，学生将熟悉现有的表面分析设备，并为新的碱性锑化物/碲化物生长设施的投产做出贡献。还将使用TESS仪器收集补充数据。在项目的后半部分，将生产光电阴极，用于在VELA加速器中进行测试，并进行测试前和测试后的表征。加速器内测试将使用现有的诊断套件进行，包括用于测量能量和能量扩散的光谱仪系列、用于发射度测量的四次扫描和用于束团长度(因此是响应时间)表征的横向偏转腔。拟议的项目有能力产生相当大的影响。产生的数据将为支持VELA/CLARA加速器的运营提供宝贵的投入，特别是有助于建立稳定可靠的运行条件。此外，这些结果将有助于为拟议的英国XFEL和FCC原型制定正在进行的电子注入器规范，发展专业知识并降低与加速器这一关键子系统相关的风险。最终，这项工作将有助于正在进行的了解和改进光电阴极性能的国际努力，这对自由电子激光应用和高能物理机器都是重要的。