H. Tanabe T. Yamada T. Watanabe K. Gi K. Kadowaki M. Inomoto R. Imazawa M. Gryaznevich C. Michael B. Crowley N. J. Conway R. Scannell J. Harrison I. Fitzgerald A. Meakins N. Hawkes K. G. McClements T. OGorman C. Z. Cheng Y. Ono The MAST Team
Electron and ion heating characteristics during merging reconnection startup on the MAST spherical tokamak have been revealed in detail using 130 channel YAG- and 300 channel Ruby-Thomson scattering system and a new 32 chord ion Doppler tomography diagnostic. Detailed 2D profile measurements of electron and ion temperature together with electron de…
Preprint PublishedG. Xia Y. Liu Y. Liu G. Z. Hao L. Li
The synergetic effects of drift kinetic resonances, the resistive layer dissipation, the magnetic feedback, and the toroidal plasma flow on the stability of the resistive wall mode are numerically investigated using a full toroidal resistive magnetohydrodynamic-kinetic hybrid stability code MARS-K (Liu Y Q et al 2008 Phys. Plasmas 15 112503). It is…
Preprint PublishedZ.S. Qu M.J. Hole M. Fitzgerald
An unstable branch of energetic geodesic acoustic mode (EGAM) is found using the fluid theory with fast ions characterised by their narrow width in energy distribution and collective transit along field lines. This mode, with a frequency much lower than the thermal GAM frequency !GAM, is now confirmed as a new type of unstable EGAM : a reactive in…
Preprint PublishedH. He Y. Liu J. Q. Dong G. Z. Hao T. Wu Z. He K. Zhao
The resonant interaction between the energetic particle triggered fishbone mode and the shear Alfven waves is, for the first time, computationally observed and firmly demonstrated based on a tokamak plasma equilibrium, using the self-consistent MHD-kinetic hybrid code MARS-K [Y. Q. Liu et al., Phys. Plasmas 15, 112503 (2008)]. This type of continuu…
Preprint PublishedL. W. G. Morgan D. Kotlyar
Monte Carlo particle transport (MCPT) codes are incredibly powerful and versatile tools to simulate particle behavior in a multitude of scenarios, such as core/criticality studies, radiation protection, shielding, medicine and fusion research to name just a small subset applications. However, MCPT codes can be very computationally expensive to run …
Preprint PurchaseJ. S. Wróbel D. Nguyen-Manh K. J. Kurzyd?owski S. L. Dudarev
The occurrence of segregation in highly dilute alloys under irradiation is an unusual phenomenon that has so far eluded theoretical explanation. The fact that solute atoms segregate in alloys that, according to thermodynamics, exhibit full solubility, has significant practical implications, as the formation of precipitates strongly affects physical…
Preprint PurchaseI. Toda-Caraballo J.S. Wróbel S.L. Dudarev D. Nguyen-Manh P.E.J. Rivera-Díaz-del-Castillo
A methodology to compute the distribution of interatomic distances in highly concentrated multicomponent alloys is proposed. By using the unit cell parameter and bulk modulus of the elements involved, the method accurately describes the distortion in the lattice produced by the interaction of the different atomic species. To prove this, density fun…
Preprint PurchaseE. Lerche D. Van Eester Y. Kazakov P. Jacquet I. Monakhov M. Goniche L. Colas F. Rimini K. Crombé R. Dumont V. Kiptily M. Santala JET Contributors
Heating single ion species plasmas with ICRF is a challenging task: Fundamental ion cyclotron heating (w = w ci ) suffers from the adverse polarization of the RF electric fields near the majority cyclotron resonance while second harmonic heating (w = 2w ci ) typically requires pre-heating of the plasma ions to become efficient. Recently, w = 2w ci …
Preprint PublishedJ. Varje O. Asunta M. Cavinato M. Gagliardi E. Hirvijoki T. Kurki-Suonio Y. Liu V. Parail G. Saibene S. Sipäl A. Snicker K. Särkimäki S. Äkäslompolo
Mitigating edge localized modes (ELMs) with resonant magnetic perturbations (RMPs) can increase energetic particle losses and resulting wall loads, which have previously been studied in the vacuum approximation. This paper presents recent results of fusion alpha and NBI ion losses in the ITER baseline scenario modelled with the Monte Carlo orbit fo…
Preprint PublishedI. Jenkins C.D. Challis D.L. Keeling E. Surrey
Engineering and technical constraints on Neutral Beam Injection (NBI) in DEMO may determine the available beam energy and may also strongly impact the Neutral Beam Current Drive (NBCD) efficiency by restricting available beam tangential radii. These latter are determined by factors such as the inter-TF coil spacing, as well as the degree of requir…
Preprint Published