Maria Lorena Richiusa Wayne Arter Dominic Calleja Medhi Firdaouss Jonathan Gerardin Michael Kovari Francesco Maviglia Zsolt Vizvary
Within the framework of EUROfusion DEMO First Wall and limiter design activities, the protection of the First Wall against power deposition peaks is being considered. During steady-state operation, the radiative power from the plasma could be considered uniformly spread on plasma-facing components. However, the presence of openings (i.e. g…
Preprint PublishedM. Coleman M. Kovari
The tritium start-up inventory required by a tritium self-sufficient DEMO-class fusion reactor is subject to a wide margin of uncertainty, with estimates in the literature varying from less than 1 kg to almost 20 kg for a ~2 GW fusion reactor. If ITER is successful, it is conceivable that multiple DEMO-class devices may be developed in parallel; th…
Preprint PublishedMichael Kovari Arne Kallenbach Mattia Siccinio
We have implemented a one-dimensional scrape-off layer (SOL) model in the PROCESS fusion reactor systems code. It allows reactor scenarios to be obtained while limiting both the plasma temperature of the SOL at the entrance to the sheath at the divertor target, and the power density on the target. To take account of cross-field transport in an …
Preprint PublishedM. Kovari M. Coleman I. Cristescu R. Smith
The tritium required for ITER will be supplied from the CANDU production in Ontario, but while Ontario may be able to supply 8 kg for a DEMO fusion reactor in the mid-2050s, it will not be able to provide 10 kg at any realistic starting time. The tritium required to start DEMO is uncertain within a wide margin; stocks would likely have to be shared…
Preprint PublishedM. Kovari
Calculations of the heat flux carried by plasma to the wall of a magnetic fusion machine often assume that power flows only along the field lines, but this cannot be true in general. Instead, we treat the plasma as an anisotropic non-linear thermally conducting medium. The model is physically relevant if parallel and cross-field transport are drive…
PreprintR. Kemp H. Lux M. Kovari J. Morris R. Wenninger H. Zohm W. Biel G. Federici
Although the ultimate goal of most current fusion research is to build an economically attractive power plant, the present status of physics and technology does not provide the performance necessary to achieve this goal. Therefore, in order to model how such plants may operate and what their output might be, extrapolations must be made from existin…
Preprint PublishedJ. Shimwell M. Kovari S. Lilley S. Zheng L.W.G. Morgan L.W. Packer J. McMillan
Tritium production is of critical importance to prospective DT fusion power plants. Lithium ceramic and beryllium based solid-type breeder blankets are an option for supplying the tritium required to sustain the DT plasma. This research investigates the time-varying tritium production in solid breeder blankets with different compositions. The breed…
Preprint PublishedT. R. Barrett G. Ellwood G. Pérez M. Kovari M. Fursdon F. Domptail S. Kirk S.C. McIntosh S. Roberts S. Zheng L.V. Boccaccini J-H. You C. Bachmann J. Reiser M. Rieth E. Visca G. Mazzone F. Arbeiter P.K. Domalapally
The European DEMO power reactor is currently under conceptual design within the EUROfusion Consortium. One of the most critical activities is the engineering of the plasma-facing components (PFCs) covering the plasma chamber wall, which must operate reliably in an extreme environment of neutron irradiation and surface heat and particle flux, while …
Preprint PublishedM. Kovari F. Fox C. Harrington R. Kembleton P. Knight H. Lux J. Morris
PROCESS is a reactor systems code it assesses the engineering and economic viability of a hypothetical fusion power station using simple models of all parts of a reactor system. PROCESS allows the user to choose which constraints to impose and which to ignore, so when evaluating the results it is vital to study the list of constraints used. New …
Preprint PublishedJ. Morris R. Kemp M. Kovari J. Last P. Knight
Power plant studies using systems codes allow the optimisation of designs to maximise or minimise some figure of merit: fusion power gain or cost of electricity, for example. The code should trade off between parameters to find the optimum whilst producing a solution consistent with physics and technology limitations. This paper describes the recen…
Preprint Published