The study of neutron interactions with matter underpins our understanding of everything from the resilience of materials in a nuclear reactor, the production of radionuclides which are produced inside a reactor with potential for medical applications, all the way to understanding the radiobiology of neutron interactions with cells and the potential for both the formation and treatment of cancer. Unlike understanding the interaction of protons, where high fluxes of protons, or even ions, is possible, creating intense beams of neutrons is extremely challenging. As such the properties of matter irradiated by neutrons is an area which still requires advances in research. This is particularly the case for the understanding of nuclear reactors. Present generation reactors have lifetime limits which are often restricted by the materials performance of either the moderator (for example in the AGR power stations this is graphite), reactor pressure vessel (e.g. in PWR designs) or even the reliability of the systems, both electronic and mechanical, that are used in the control and operation of the reactor. Measurements of the degradation of the properties allow a prediction of their lifetime to failure and hence enhances safety and assurance. However, this is rather an empirical approach and a more sophisticated method would be to develop a detailed understanding of the damage mechanisms and how these then link to the macroscopic materials failure characteristics, such as embrittlement or radiation assisted corrosion. To develop this understanding it is necessary to irradiate materials and then understand how their properties are being transformed on the microscopic scale. This may then be used to motivate the development of accurate models of the processes which may be used to predict materials failure. The limited availability of neutron irradiation facilities has resulted in the use of proton irradiation to attempt to simulate the almost identical neutron. However, the neutron is different in a very important way - it is uncharged. As a proton passes through a material, as well as colliding with the atomic nuclei, its charge perturbs the electrons. Thus, the type of damage is very different. To move the field forward a well-developed neutron irradiation programme is required. This can be performed in materials test reactors, but these are expensive, have limited access and thus constrain the volume of research that can be performed. The creation of new reactor test facilities is expensive and challenging due to the challenges and expense in their operation. An exciting alternative is to use an accelerator based approach which accelerates protons and, through a nuclear reaction, converts them to neutrons and thus, a flux of neutrons can be created. To do this requires a high current proton accelerator. It is only recently that credible accelerators with the required properties have been developed and exploited. The present proposal is to use this approach to create an accelerator based neutron irradiation facility at the University of Birmingham. This will be capable of creating neutron fluxes which are close to that inside a nuclear reactor which may be used for materials irradiation. The flexibility of the facility will allow testing of the degradation of materials during the irradiation, i.e. in situ, to better characterise the changes to the material. The intention is to establish a national facility which allows users to develop a scientific programme which links to the higher flux materials test reactors. It will draw in existing facilities such as the MC40 cyclotron at the University of Birmingham, and the precision energy neutron facility at the National Physical Laboratory. This breadth of capability will provide the UK community with a suite of nuclear facilities capable of supporting the development of the nuclear sector.

The energy systems in both the UK and China face challenges of unprecedented proportions. In the UK, it is expected that the amount of electricity demand met by renewable generation in 2020 will be increased by an order of magnitude from the present levels. In the context of the targets proposed by the UK Climate Change Committee it is expected that the electricity sector would be almost entirely decarbonised by 2030 with significantly increased levels of electricity production and demand driven by electrification of heat and transport. In China, the government has promised to cut greenhouse gas emission per unit of gross domestic product by 40-45% by 2020 based on the 2005 level. This represents a significant challenge given that over 70% of its electricity is currently generated by coal-fired power plants. Energy storage has the potential to provide a solution towards these challenges. Numerous energy storage technologies exist currently, including electrochemical (batteries, flow batteries and sodium sulphate batteries etc), mechanical (compressed air and pumped hydro etc), thermal (heat and cold), and electrical (supercapacitors). Among these storage technologies, thermal energy storage (TES) provides a unique approach for efficient and effective peak-shaving of electricity and heat demand, efficient use of low grade waste heat and renewable energy, low-cost high efficiency carbon capture, and distributed energy and backup energy systems. Despite the importance and huge potential, little has been done in the UK and China on TES for grid scale applications. This forms the main motivation for the proposed research. This proposed research aims to address, in an integrated manner, key scientific and technological challenges associated with TES for grid scale applications, covering TES materials, TES components, TES devices and integration. The specific objectives are: (i) to develop novel TES materials, components and devices; (ii) to understand relationships between TES material properties and TES component behaviour, and TES component behaviour and TES device performance; (iii) to understand relationship between TES component behaviour and manufacturing process parameters, and (iv) to investigate integration of TES devices with large scale CAES system, decentralized microgrid system, and solar thermal power generation system. We bring together a multidisciplinary team of internationally leading thermal, chemical, electrical and mechanical engineers, and chemical and materials scientists with strong track records and complementary expertise needed for comprehensively addressing the TES challenges. This dynamic team comprises 15 leading academics from 4 universities (Beijing University of Technology, University of Leeds, University of Nottingham and University of Warwick, and 2 Chinese Academy of Sciences Research Institutes (Institute of Engineering Thermophysics and Institute of Process Engineering), and 7 industrial partners.