O. El-Atwani N. Li M. Li A. Devaraj M. Schneider D. Sobieraj J.S. Wrobel D. Nguyen-Manh S. A. Maloy E. Martinez
A novel W-based refractory high entropy alloy with outstanding radiation resistance has been developed. The alloy was grown as thin films showing a bimodal grain size distribution in the nanocrystalline and ultrafine regimes and a unique 4 nm lamella-like structure revealed by atom probe tomography (APT). Transmission electron microscopy (TEM) and …
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 PublishedA.V. Melnikov E. Ascasibar A. Cappa F. Castejon L.G. Eliseev C. Hidalgo P.O. Khabanov N.K. Kharchev A.S. Kozachek L.I. Krupnik M. Liniers S.E.Lysenko J.L. dePablos V.N. Zenin S.E. Sharapov M.V. Ufimtsev and TJ-II team
Alfven Eigenmodes were studied in low magnetic shear flexible heliac TJ-II (B0=0.95 T, =1.5 m, =0.22 m) NBI heated plasmas (PNBI <1.1 MW, ENBI=32 keV) by Heavy Ion Beam Probe (HIBP) [1, 2, 3]. The L-mode hydrogen plasma was investigated at various magnetic configurations with rotational transform t(a)/2
Preprint PublishedMatti Coleman Y. Hoerstensmeyer F. Cismondi
One of the overarching goals of a DEMO-class device is to demonstrate tritium self-sufficiency in a fusion power plant for the first time. A future power reactor will necessarily require a start-up inventory of tritium, mT start, before commencing fully fledged D-T operations for electricity production. In Europe, it is also presently cons…
Preprint PublishedF. Koechl A.R. Polevoi C.S. Byun D.H. Na J.M. Seo F.A.A. Felici A. Fukuyama J. Garcia N. Hayashi C.E. Kessel T. Luce J.M. Park F. Poli O. Sauter A.C.C. Sips P. Strand A. Teplukhina I. Voitsekhovitch A. Wisitsorasak X. Yuan
We report results of the benchmarking of core particle transport simulations by the codes widely used in the interpretative transport analyses and predictive modelling of tokamak plasmas. Our analysis includes formulation of transport equations, difference between electron and ion particle solvers, comparison of simulations of particle sinks and so…
Preprint PublishedM. Willensdorfer T.B. Cote M. Griener D.A. Ryan E. Strumberger W. Suttrop N. Wang M. Cavedon S.S. Denk M. Dunne R. Fischer J. Galdon-Quiroga C.J. Ham C.C. Hegna M. Hoelzl A. Kirk M. Maraschek F. Mink N. Leuthold F. Orain E. P. Seliunin H. Zohm the ASDEX Upgrade Team and the MST1 Team
The impact of the three-dimensional (3D) tokamak geometry from external magnetic perturbations (MPs) on the local edge stability has been examined in high confinement mode (H-mode) plasmas with edge localised modes (ELMs) in ASDEX Upgrade. The 3D geometry has been probed using rigidly rotating MP fields. The measured distortions of the plasma bound…
Preprint PublishedKerry Lawson K M Aggarwal, I H Coffey, F P Keenan, M G O'Mullane
Helium is widely used as a fuel or minority gas in laboratory fusion experiments, and will be present as ash in DT thermonuclear plasmas. It is therefore essential to have a good understanding of its atomic physics. To this end He II population modelling has been undertaken for the spectroscopic levels arising from shells with principal quantum…
Preprint PublishedJonathan Shimwell Remi Delaporte-Mathurin Jean-Charles Jaboulay Julien Aubert Chris Richardson Chris Bowman Andrew Davis Jamie Bernardi Sikander Yasin Xiaoying Tang
Breeding blankets are designed to ensure tritium self-sufficiency in deuterium- tritium fusion power plants. In addition to this, breeder blankets play a vital role in shielding key components of the reactor, and provide the main source of heat which will ultimately be used to generate electricity. The design of blankets is critical to the success …
Preprint PublishedLlion Evans L. Margetts P.D. Lee C.A.M. Butler E. Surrey
Functional materials’ properties are influenced by microstructures which can be changed during manufacturing. Experimental characterisation is often time consuming and expensive. A technique is presented which digitises graphite foam via X-ray tomography and converts it into image-based models to determine properties in silico. By simulating a la…
Preprint PublishedLeo Ma S. L. Dudarev
Formation and migration energies, elastic dipole and relaxation volume tensors of nano-defects are the parameters that determine the rates of evolution of microstructure under irradiation and the magnitude of macroscopic elastic stresses and strains resulting from the accumulation of defects in materials. To find accurate values of these parameters…
Preprint Published