Front End Test Stand (FETS) - Continuation

高功率质子加速器（HPPAs）是许多未来大型科学设施的核心，例如散裂中子源、中微子工厂、能量或强度前沿的高能物理、加速器驱动的次临界系统以及核废料的嬗变。在注入环形加速器（同步加速器或FFAG）期间，控制束流损失引起的机器激活对于HPPA的安全操作是必不可少的，并且要求注入器直线加速器中的束流在同步加速器旋转频率下被非常精确地斩波。RAL的前端测试台（FETS）的主要目标是演示3 MeV能量的高质量、高强度、负氢离子束的完美斩波。虽然主要是硬件建设项目，FETS合作已成为分享真实的财富的有效机制，ISIS和ASTeC强束组内的世界加速器专业知识与更广泛的学术界以及受益于大学团体的专业知识和专业知识。已经开展的工作为英国作为卓越中心的持续国际声誉做出了贡献，并促进了与CERN，FNAL，ESS和CNS等领先的国际加速器机构的合作。FETS由高亮度潘宁表面等离子体负氢离子源，在65 keV下的磁性低能束流传输（LEBT），以将束流匹配到3 MeV射频四极杆（ERF）中工作频率为324 MHz，将60 mA射束输送至斩波系统所在的中能射束输送装置（MEBT）。全面、先进的诊断技术可测量系统性能和光束质量。离子源、LEBT和高功率RF系统已经调试，并且正在制造FET。通过此建议，我们寻求资源以及时完成FETS的建设。这将需要：安装、测试和调试激光束转换器;通过激光束转换器加速所需的光束强度和光束质量;完成工程设计和斩波器系统的制造;安装、测试和调试MEBT和斩波器系统;通过MEBT传输光束并演示精确和有效的光束斩波;此外，我们建议评估额外的好处，将利用场效应晶体管作为质子加速器系统的进一步发展的驱动程序。

High power proton accelerators (HPPAs) are at the heart of many future large scale scientific facilities such as a spallation-neutron source, Neutrino Factory, high energy physics at the energy or intensity frontier, accelerator driven sub-critical systems, and the transmutation of nuclear waste. Controlling beam-loss induced machine activation during injection into a circular accelerator (synchrotron or FFAG) is essential for safe operation of HPPAs and requires the beam in the injector linac to be chopped very precisely at the synchrotron revolution frequency. The Front End Test Stand (FETS) at RAL has as its primary aim to demonstrate perfect chopping of a high quality, high intensity, negative Hydrogen ion beam at an energy of 3 MeV.Although primarily a hardware construction project, the FETS collaboration has become an efficient mechanism for sharing the wealth of real-world accelerator expertise within ISIS and the ASTeC Intense Beams Group with the wider academic community as well as benefitting from the specialisations and expertise of the university groups. The work already undertaken has contributed to the UK's continuing international reputation as a centre of excellence and has stimulated collaborations with leading international accelerator institutes such as CERN, FNAL, ESS and CNS.FETS consists of a high-brightness Penning surface plasma negative-hydrogen-ion source, magnetic Low Energy Beam Transport (LEBT) at 65 keV to match the beam into a 3 MeV Radio Frequency Quadrupole (RFQ) operating at 324 MHz which delivers the 60mA beam to the Medium Energy Beam Transport (MEBT) where the chopping systems are situated. Comprehensive, state-of-the-art diagnostics measure the performance of the system and the beam quality. The ion source, LEBT and high power RF systems have been commissioned and the manufacture of the RFQ is underway.With this proposal we seek the resources to complete the construction of FETS in a timely manner. This will entail:The installation, testing and commissioning of the RFQ;Accelerating the desired beam intensity and beam quality through the RFQ;The completion of the engineering design and the manufacture of the chopper systems;The installation, testing and commissioning the MEBT and chopper systems;The transmission of beam through the MEBT and the demonstration of precise and efficient beam chopping; and Evaluating the performance of the complete test stand. In addition, we proposed to evaluate the additional benefits that will accrue from exploiting the FETS as a driver for further developments in proton accelerator systems.