UKAEA Papers

"Non-Axisymmetric Equilibrium and Stability using the ELITE Stability Code"

• M.S. Anastopoulos-Tzanis
• B.D. Dudson
• C.J. Ham
• C.C. Hegna
• P.B. Snyder
• H.R. Wilson

A linear perturbation theory is used to model the MHD stability of tokamak equilibria under the application of external 3D magnetic perturbations [C.C. Hegna, Physics of Plasmas 21 :072502, 2014]. The symmetry breaking produces the coupling of toroidal n modes. We use ELITE [H.R. Wilson et al., Physics of Plasmas 9 :1277, 2002] to produ…

"Toroidal and slab ETG instability dominance in the linear spectrum of JET-ILW pedestals"

• J F Parisi
• F I Parra
• C M Roach
• C Giroud
• W Dorland
• D R Hatch
• M Barnes
• J C Hillesheim
• N Aiba
• J R Ball
• P G Ivanov

Local linear gyrokinetic simulations show that electron temperature gradient (ETG) instabilities are the fastest growing modes for kyρi >~ 0.1 in the steep gradient region for a JET pedestal discharge (92174) where the electron temperature gradient is steeper than the ion temperature gradient. Here, ky is the wa…

"Zonally dominated dynamics and Dimitsthreshold in curvature-driven ITG turbulence"

• P G Ivanov
• A A Schekochihin
• W Dorland
• A R Field
• F I Parra

The saturated state of turbulence driven by the ion-temperature-gradient instability is investigated using a two-dimensional long-wavelength fluid model that describes the perturbed electrostatic potential and perturbed ion temperature in a magnetic field with constant curvature (a Z-pinch) and an equilibrium temperature gradient. Numerical simulat…

"Development of low-activation martensitic stainless steels"

• D Duliew, KW Tupholme, GJ Butterworth

"Recombination between electrons and atomic ions Part 2 Optically thin plasmas"

• DR Bates
• AE Kingston
• RWP McWhirter

"Development of high manganese high nitrogen low activation austenitic stainless steels"

• AH Bott, FB Pickering, GJ Butterworth

"Mixed Hydrogen-Deuterium plasmas on JET ILW"

• D. B. King
• E. Viezzer
• I. Balboa
• M. Baruzzo
• E. Belonohy
• J. Buchanan
• I.S. Carvalho
• K. Cave-Ayland
• I. Coffey
• C.D. Challis
• E.G. Delabie
• L. Garzotti
• S. Hall
• J.Hillesheim
• L. Horvath
• E. Joffrin
• D. Keeling
• K. Kirov
• C.F. Maggi
• M. Maslov
• S. Saarelma
• S. Silburn
• E.R. Solano
• M. Stamp
• D. Valcarcel
• H.Weisen

A study of mixed hydrogen-deuterium H-mode plasmas has been carried out in JET-ILW to strengthen the physics basis for extrapolations to JET D-T operation and to support the development of strategies for isotope ratio control in future experiments. Variations of input power, gas fuelling and isotopic mixture were performed in H-mode plasmas of the…

"Compatibility of pellet fuelling with ELM suppression by RMPs in the ASDEX Upgrade tokamak"

• M Valovič
• P T Lang
• A Kirk
• W Suttrop
• A Bock
• P J Mc Carthy
• M Faitsch
• B Plöckl2
• the ASDEX Upgrade team
• the EUROfusion MST1 team

It is demonstrated that tokamak plasma can be fuelled by pellets while simultaneously maintaining ELM suppression by external resonant magnetic perturbations (RMPs). Pellets are injected from vertical high field site and deposited at outer part of plasma cross section. Each pellet triggers benign MHD event followed by short lived ELM free phase. Th…

"Grazing incidence spectra of highly ionized oxygen in a theta-pinch"

• NJ Peacock

"First-principles-based multiple-isotope particle transport modelling at JET"

• M Marin
• J Citrin
• C Bourdelle
• Y Camenen
• F J Casson
• A Ho
• F Koechl
• M Maslov
• JET Contributors

Core turbulent particle transport with multiple isotopes can display observable differences in behaviour between the electron and ion particle channels. Experimental observations at JET with mixed H-D plasmas and varying NBI and gas-puff sources [M. Maslov et al., Nucl. Fusion 7 076022 (2018)] inferred source dominated electr…