RF Power Systems and Optimized RF structures for electron beam acceleration

拟议工作的最终目标是设计一种用于癌症治疗的模块化直线加速器，其子系统最少，使其坚固，可靠，可供中低收入社区使用。科技促进委员会、欧洲核研究组织和国际经济合作理事会最近与官方发展援助国家的代表合作主办的讲习班确定了实现这一目标的路线图。它基于这样的想法，即利用加速器科学解决方案中最好的解决方案，并使其适应与官方发展援助国家的挑战性环境，财务状况和知识可用性相关的具体问题。该项目旨在设计可负担得起的，坚固的，高效的和易于维护的加速结构，同时保持设计处于现有技术解决方案的最前沿。为了实现这些目标，RF加速结构的设计将基于CLIC系统并适应1.3GHz频率，从而能够使用低压固态RF电源或速调管或磁控管等替代源。为了使其模块化，所需的子系统最少，结构将是真空密封的，真空泵将需要保持真空和LINAC操作。i.e.no这将降低整体资本和维护成本。为了降低腔体的制造成本，将试验一种新的腔体制造工艺。腔体将使用CNC车床从两个铝块加工而成。这也将减少腔的重量，允许实现6 MeV-8 MeV的射束能量，而RF腔长度为约30 cm。物理系车间有使用数控车床构建1.3GHz RF腔的经验，并将能够在项目的时间范围内制造腔。它还具有对结构进行真空测试的经验，并拥有所需的设备。RF磁珠拉伸试验设施（JAI Oxford和达雷斯伯里实验室）将用于测量工作模式和高阶模式。腔体将在JAI Oxford进行密封和真空测试，并运送到CERN进行高功率RF测试。腔室将保持密封，以观察是否会随时间发生任何真空退化。为确保该系统适合官方发展援助国家，将邀请尼日利亚和坦桑尼亚的合作伙伴参加牛津研讨会，以测试该系统并就设计的人体工程学提出建议。我们计划在项目期间定期（每两周）通过网络会议与所有合作伙伴进行沟通，以确保稳定和持续的进展，并确保交付成果对项目总体目标的影响。

The proposed work is driven by the ultimate goal to design a modular linear accelerator for cancer treatment with minimum subsystems making it robust, reliable and accessible to communities with lower and intermidiate incomes. The road map to achieve this goal was identified during the recent workshop hosted by STFC, CERN and ICEC in partnership with representatives from ODA countries. It is based on the idea to use the best available in accelerator science solutions and adapt them to specific problems linked to the challenging environments, financial situations and knowledge availability in the ODA countries. This project aims to design accelerating structures which can be affordable, robust, efficient and easy to look after, while keeping the design at the cutting edge of the technological solutions available. To achieve the goals the design of the RF accelerating structure will be based on the CLIC system and adapted to the 1.3GHz frequency enabling the use of either a low voltage solid state RF power supply or alternative sources like klystron or magnetron. To make it modular with minimum subsystems required the structure will be vacuum sealed i.e.no vacuum pumps will be needed to maintain the vacuum and LINAC operation. This will reduce the overall capital and maintenance cost. To reduce the manufacturing cost of the cavity a new technology of cavity manufacturing will be tested. The cavity will be machined from two aluminium blocks using CNC lathe. This will also reduce the weight of the cavity allowing the beam energy of 6MeV -8MeV to be achieved while RF cavity length is around 30cm. The Department of Physics workshop has experience of building a 1.3GHz RF cavity using CNC lathe and will be able to manufacture the cavity in the time scale of the project. It also has experience with vacuum testing of the structures and has the equipment required. The RF bead pull test facilities (JAI Oxford and Daresbury Laboratory) will be used to measure operating and high order modes. The cavity will be sealed and vacuum tested in JAI Oxford and transported to CERN for high power RF tests. The cavity will be kept sealed to observe whether any vacuum degradation will take place with time. To ensure that the system is suitable for ODA countries the partners from Nigeria and Tanzania will be invited to the workshop in Oxford to test the system and advise on ergonomics of the design. We plan to communicate regularly (every two weeks) with all partners via web-meetings during the project to ensure stable and continuous progress as well as securing the impact of the deliverables to the overall aim of the project.