B. Chapman R.O. Dendy K.G. McClements S.C. Chapman G.S. Yun S.G. Thatipamula M.H. Kim
Ion cyclotron emission (ICE) is detected during edge localised modes (ELMs) in the KSTAR tokamak at harmonics of the proton cyclotron frequency in the outer plasma edge. The emission typically chirps downward (occasionally upward) during ELM crashes, and is driven by confined 3MeV fusion-born protons that have large drift excursions from the plasma…
Preprint PublishedN.R. Walkden A. Wynn F. Militello B. Lipschultz G. Matthews C.Guillemaut J. Harrison D. Moulton JET Contributors
Statistical analysis of the ion flux to the JET outer-wall is conducted in outer-wall limiter mounted Langmuir probe (OLP) time-series across a wide range of plasma current and line-averaged density during Ohmically heated horizontal target L-mode plasmas. The mean, _, and the standard deviation, _, of the ion-saturation current measured by the OLP…
Preprint PublishedF. Militello T. Farley K. Mukhi N. Walkden J.T. Omotani
A statistical framework was introduced in textit{Militello et al., Nucl. Fusion 56, 104004 (2016)} to correlate the dynamics and statistics of L-mode and inter-ELM plasma filaments with the radial profiles of thermodynamic quantities they generate in the Scrape Off Layer. This paper extends the framework to cases in which the filaments are emitted …
Preprint PublishedZ. Leong J.S. Wróbel S.L. Dudarev R. Goodall I. Todd D. Nguyen-Manh
Multicomponent systems, termed High Entropy Alloys (HEAs), with predominantly single solid solution phases are a current area of focus in alloy development. Although different empirical rules have been introduced to understand phase formation and determine what the dominant phases may be in these systems, experimental investigation has revealed tha…
Preprint PublishedJ. W. Connor R. J. Hastie P. Helander
A set of layer equations for determining the stability of semi-collisional tearing modes in an axisymmetric torus, incorporating neoclassical physics, in the small ion Larmor radius limit is provided. These can be used as an inner layer module for inclusion in numerical codes that asymptotically match the layer to toroidal calculations of the teari…
Preprint PublishedP. A. Abdoul D. Dickinson C. M. Roach H. R. Wilson
In this work, using solutions from a local gyrokinetic flux-tube code combined with higher order ballooning theory, a new analytical approach is developed to reconstruct the global linear mode structure with associated global mode frequency. In addition to the isolated mode (IM), which usually peaks on the outboard mid-plane, the higher order ballo…
Preprint PublishedK. Arakawa M. Marinica S. Fitzgerald L. Proville D. Nguyen-Manh S.L Dudarev P. Wai Ma T.D Swinburne T. Yamada T. Amino S. Arai Y. Yamamoto K. Higuchi N. Tanaka H. Yasuda T. Yasuda H. Mori
Quantum dynamics within solids is usually restricted to low mass particles such as electrons and muons, or single atoms of light elements such as hydrogen. In this letter we report observation of the quantum-assisted motion of self-interstitial atom clusters in tungsten (each of mass 184 Da), travelling distances of several nanometres between trapp…
PreprintF. Militello B. Dudson L. Easy A. Kirk P. Naylor
The interaction of L-mode and inter-ELM Scrape-Off Layer (SOL) filaments is investigated by simulating the dynamics of two seeded density perturbations with different initial separation. A numerical campaign of 2D and 3D simulations is presented to explore the effect that different filaments' perpendicular size and relative distance have on their r…
Preprint PublishedR. S. Hemsworth D. Boilson P. Blatchford M. Dalla Palma G. Chitarin H. P. L. de Esch F. Geli M. Dremel J. Graceffa D. Marcuzzi G. Serianni D. Shah M. Singh M. Urbani P. Zaccaria
The heating neutral beam injectors (HNBs) of ITER are designed to deliver 16.7MWof 1 MeVD0 or 0.87 MeVH0 to the ITER plasma for up to 3600 s. They will be the most powerful neutral beam (NB) injectors ever, delivering higher energy NBs to the plasma in a tokamak for longer than any previous systems have done. The design of the HNBs is based on the …
PublishedK.G. McClements J. Allen S.C. Chapman R.O. Dendy S.W.A. Irvine O. Marshall D. Robb M. Turnyanskiy R.G.L. Vann
The merging-compression method of plasma start-up in the Mega Amp Spherical Tokamak (MAST) involved the creation of two plasma tori with parallel currents, which merged at the vacuum vessel midplane due to their mutual attraction. Magnetic reconnection occurred in this process causing strong heating of both ions and electrons on millisecond timesca…
Preprint Published