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Culham, United Kingdom

Nicholas J.R.,Thermo Fluids | Ireland P.,Thermo Fluids | Hancock D.,CCFE | Robertson D.,Rolls-Royce
Fusion Engineering and Design

A low temperature jet impingement based heat sink module has been developed for potential application in a near-term fusion power plant divertor. The design is composed of a number of hexagonal CuCrZr sheets bonded together in a stack to form a laminate structure. This method allows the production of complex flow paths using relatively simple manufacturing techniques. The thermo-fluid performance of a baseline design employing cascade jet impingement has been assessed and compared to a non-cascade case. Experimental validation of the numerical work was carried out on a scaled model using air as the working fluid. Local heat transfer coefficients were obtained on the surface using surface temperature data from thermochromic liquid crystals. © 2015 The Authors. Published by Elsevier B.V. Source

Davis A.,CCFE | Holloway N.,CCFE
Chemical Engineer

Andrew Davis and Nick Halloway share their views on the process involved in producing fusion energy and roles played by engineers and material scientists to realize its potential. These professionals are increasingly focusing on generating energy from such fusion reactions due to the abundant supply of deuterium and tritium fuel sources around the world. Fusion has major environmental advantages, including eliminating greenhouse gases from energy production, with helium being the only by-product of the process. The tritium fuel is also radioactive and energetic neutrons from fusion reactions activate the structures of the reactor. The half-lives of tritium and the activated structural materials will ensure that the waste can be consigned to landfill or recycled for use in a new fusion plant. Fusion is being regularly achieved at experimental devices such as the European JET facility at Culham Center for Fusion Energy (CCFE) in the UK. Source

Harman J.,CCFE | Harman J.,European Fusion Development Agreement | Federici G.,European Fusion Development Agreement | Kemp R.,CCFE
2013 IEEE 25th Symposium on Fusion Engineering, SOFE 2013

The European Fusion Roadmap [1] shows the DEMO concept design phase commencing in 2014. The early implementation of systems engineering principles within the EU DEMO programme is essential to provide a framework for achieving this long-term mission. The aim of the systems engineering approach is to clearly define and justify the research and development (R&D) necessary to deliver a credible EU DEMO concept design by 2020 that will meet the agreed DEMO system requirements. The approach will lead to increased efficiency in the deployment of limited R&D resources and will facilitate the necessary discussion and agreement amongst stakeholders. Furthermore, it will enable transparent prioritisation of the required R&D for the strategically important technologies for DEMO. A systems decision process (SDP) is presented that provides a systematic, objective and traceable method for evaluating DEMO technologies and designs according to their capability to meet the top-level system criteria for the overall DEMO plant. Two preliminary examples where this approach should be applied are discussed: (i) the choice of primary coolant and (ii) the extension of pulse duration through auxiliary current drive. © 2013 IEEE. Source

Boccaccini L.V.,Karlsruhe Institute of Technology | Aiello G.,CEA Saclay Nuclear Research Center | Aubert J.,CEA Saclay Nuclear Research Center | Bachmann C.,EUROfusion | And 11 more authors.
Fusion Engineering and Design

The design of a DEMO reactor requires the design of a blanket system suitable of reliable T production and heat extraction for electricity production. In the frame of the EUROfusion Consortium activities, the Breeding Blanket Project has been constituted in 2014 with the goal to develop concepts of Breeding Blankets for the EU PPPT DEMO; this includes an integrated design and R&D programme with the goal to select after 2020 concepts on fusion plants for the engineering phase. The design activities are presently focalized around a pool of solid and liquid breeder blanket with helium, water and PbLi cooling. Development of tritium extraction and control technology, as well manufacturing and development of solid and PbLi breeders are part of the programme. © 2016. Source

Oh J.-S.,National Fusion Research Institute | Choi J.,National Fusion Research Institute | Suh J.-H.,National Fusion Research Institute | Lee L.,Dawonsys Co. | And 19 more authors.
Fusion Engineering and Design

The final design of the ITER TF, CS, CC and VS AC/DC converters has been completed to implement ITER requirements following the detailed design and refinements of the preliminary design. The number of parallel thyristors and the rating of fuses are coordinated to keep those devices within the explosion limit even under most severe fault conditions. The impedance of the converter transformer has been optimized taking into account the energization inrush current, short circuit current, reactive power consumption and the available DC voltage. To ensure system integrity, AC/DC converters are mechanically divided into transformers, AC busbars, 6-pulse bridges, DC interconnecting busbars and DC reactors, and then all subsystems are decoupled by flexible links. To provide stable real time network communication down to the converters, a one GbE link is deployed between master controllers and local controllers. IEEE 1588 is implemented to the embedded controllers for precision time synchronization. This paper describes the detailed solutions implemented in the final design for the ITER AC/DC converters with R&D results of converter prototypes. © 2015 Elsevier B.V. Source

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