A R Field D Fajardo F J Casson C Angioni C D Challis J Hobirk A Kappatou Hyun-Tae Kim E Lerche A Loarte J Mailloux JET Contributors
Screening of high-Z (W) impurities from the confined plasma by the temperature gradient at the hot edge pedestal of fusion-grade H-mode plasmas has been demonstrated for the first time in the JET-ILW tokamak. Through careful optimisation of the hybrid-scenario, deuterium plasmas with sufficient heating power (≳ 32MW), high enough ion temperature …
PreprintS B L Chislett-McDonald E Surrey J Naish A Turner D P Hampshire
All high field superconductors producing magnetic fields above 12 T are brittle. Nevertheless, they will probably be the materials of choice in commercial tokamaks because the fusion power density in a tokamak scales as the fourth power of magnetic field. Here we propose using robust, ductile superconductors during the reactor commissioning phase i…
PreprintHyun-Tae Kim Francis Casson Hendrik Meyer Geof Cunningham Rory Scannell Lucy Kogan James Harrison Seong-Cheol Kim Jeong-Won Lee Jin-Woo Gwak Yong-Su Na Xavier Litaudon Gloria Falchetto3 MAST team
This paper describes the development of electromagnetic plasma burn-through model. Full circuit equations describing the currents in solenoid, poloidal field coil, and toroidally conducting passive structure have been integrated into the differential equation system of the plasma energy and particle balances in DYON. This enables consistent calcula…
PreprintXu Yang Yueqiang Liu Wei Xu Yuling He Guoliang Xia Hanqing Hu Lina Zhou Yutian Miao
A systematic numerical investigation is carried out to understand the effect of variation of the equilibrium pressure pedestal structure on the H-mode plasma response to the applied resonant magnetic perturbation (RMP) field in tokamaks. The plasma response to the n=1−4 (n is the toroidal mode number) RMP fields is computed and …
PreprintG. Decristoforo A. Theodorsen J. Omotani T. Nicholas O. E. Garcia
Intermittent fluctuations in the boundary of magnetically confined plasmas are investigated by numerical turbulence simulations of a reduced fluid model describing the evolution of the plasma density and electric drift vorticity in the two-dimensional plane perpendicular to the magnetic field. Two different cases are considered, one describing resi…
Preprint PublishedF. Schoofs T. N. Todd
We describe a workflow that is able to approximate basic machine parameters (including but not limited to plasma current IP, major radius R0, toroidal magnetic field B0, fusion power Pfusion) based on the choice of maximum field BTF,max on the in-boa…
Preprint PurchaseT. Adkins A. A. Schekochihin P. G. Ivanov C. M. Roach
Electromagnetic instabilities and turbulence driven by the electron-temperature gradient are considered in a local slab model of a tokamak-like plasma, with constant equilibrium gradients (including magnetic drifts but no magnetic shear). The model describes perturbations at scales both larger and smaller than the electron inertial scale de
PreprintH. J. Campbell F. Schoofs A. Reilly
Rare earth barium copper oxides (REBCO) are a particular class of cuprate high temperature superconductor. The favourable properties of REBCO coated conductor tapes (CCTs) and the well-established production methods have brought these tapes to the forefront of tokamak fusion research, showing a lot of promise for the development of powerful, hig…
PreprintC. W. W. Haddon A. I. Blair F. Schoofs D. P. Hampshire
Simulations based on time-dependent Ginzburg–Landau theory are employed to determine the critical current for a model system which represents a Nb–Ti-like pinning landscape at low drawing strain. The system consists of ellipsoids of normal metal, with dimensions 60ξ × 3ξ × 3ξ, randomly distributed throughout the superconducting bulk with t…
Preprint Published