UKAEA Papers

"Studying pedestal characteristics in MAST ELMy regimes in preparation for future spherical tokamaks"

• S.F. Smith
• A. Kirk
• B. Chapman
• J. G. Clark
• C.J. Ham
• L. Horvath
• C. F. Maggi
• R. Scannell
• S. Saarelma

MAST pedestal data has been analysed, where a pedestal database of 892 shots was obtained, using the new upgraded MAST Thomson Scattering (TS) diagnostic. Various ELM types are discussed, where characteristics and trends of MAST pedestals are shown. The data from the upgraded TS diagnostic confirms pedestal characteristics found in earlier analy…

"ELM BURN-THROUGH SIMULATIONS FOR MAST-U SUPER-X PLASMAS"

• S.F. Smith
• S.J.P. Pamela
• A. Fil
• M. Hölzl
• G.T.A. Huijsmans
• A. Kirk
• D. Moulton
• O. Myatra
• A.J. Thornton
• H.R. Wilson

The high heat fluxes to the divertor during edge localised mode (ELM) instabilities have to be reduced for a sustainable future tokamak reactor. A solution to reduce the heat fluxes could be the Super-X divertor, this divertor configuration will be tested on MAST-U. ELM simulations for MAST-U Super-X tokamak plasmas have been obtained, using JOR…

"Understanding reactor relevant tokamak pedestals"

• C J Ham
• A Bokshi
• D Brunetti
• G Bustos Ramirez
• B Chapman
• J W Connor
• D Dickinson
• A R Field
• J P Graves
• T Kiviniemi
• S Leerink
• B McMillan
• S Newton
• S Pamela
• C M Roach
• S Saarelma
• J Simpson
• S F Smith
• P Strand
• A Virtanen
• the JET Contributors*

The pedestal plays an important role in determining the confinement in tokamak H-mode plasmas. However, the steep pressure gradients in this transport barrier also lead to edge localized modes (ELMs) [1]. There is good understanding of the pedestal in type I ELM regimes [2], however, type I ELMs are known to damage plasma facing components and f…

"A wall-aligned grid generator for 3D non-linear simulations of MHD instabilities in tokamak plasmas"

• S.Pamela
• G.Huijsmans
• A.J.Thornton
• A.Kirk
• S.F.Smith
• M.Hoelzl
• T.Eich
• JET Contributors
• the MAST Team
• the JOREK Team

Typically applied to non-linear simulations of MHD instabilities relevant to magnetically confined fusion, the JOREK code was originally developed with a 2D grid composed of isoparametric bi-cubic Bezier finite elements, that are aligned to the magnetic equilibrium of tokamak plasmas. To improve the applicability of these simulations, the grid-gene…

"Numerical Simulations of Edge Localised Modes in MAST-U Plasmas"

• Siobhan Smith
• Stanislas Pamela
• Howard Wilson
• Guido Huijsmans

Edge localised modes (ELMs) are magneto-hydrodynamic (MHD) instabilities that drive filamentary plasma eruptions in high confinement tokamak discharges [1]. Gaining an improved understanding of ELMs is important [2]; in future fusion reactors such as ITER, ELM heat fluxes will need to be limited to ensure durability of divertor materials [3]. A …

"A measurement of the cross section for production of He ions by electron impact excitation of ground state helium ions"

• DF Dance
• MFA Harrison
• ACH Smith

"Simulations of edge localised mode instabilities in MAST-U Super-X tokamak plasmas"

• S.F. Smith
• S.J.P. Pamela
• A. Fil
• M. Hoelzl
• G.T.A. Huijsmans
• A. Kirk
• D. Moulton
• O. Myatra
• A.J. Thornton
• H.R. Wilson

ELM simulations for the MAST-U Super-X tokamak have been obtained, using the JOREK code. The JOREK visco-resistive MHD model has been used to obtain comparisons of divertor configurations. The simulations show a factor 10 decrease in the peak heat flux to the outer target of the Super-X in comparison to a conventional divertor configuration. A roll…

"ELM burn-through predictions for MAST-U Super-X plasmas"

• S.F. Smith
• S.J.P. Pamela
• M. Hölzl
• G.T.A. Huijsmans
• A. Kirk
• D. Moulton
• A.J. Thornton
• H.R. Wilson

During edge localised modes (ELMs) high heat fluxes are incident on divertor targets, which future fusion devices will not withstand [1]. A solution to reduce the heat fluxes could be the new Super-X divertor, which will be tested on the MAST-U tokamak. The divertor has an increased connection length, magnetic flux expansion and is designed to reta…

"Novel Methods for Recording Stress-Strain Curves in Proton Irradiated Material"

• Albert D. Smith
• Jack M. Donoghue
• Alistair J.W. Garner
• David Lunt
• Allan Harte
• Keith Wilford
• Philip J. Withers
• Michael Preuss

Proton irradiation is often used as a proxy for neutron irradiation but the irradiated layer is typically

"DEVELOPING DEMO DESIGN CRITERIA"

• M. Kalsey
• M. Gorley
• P. Smith
• D. Samuel

There is currently a European collaboration that is working towards developing a Demonstration Fusion Reactor (European DEMO). This project is currently defining the high level plant architecture of a DEMO reactor, whilst developing conceptual design solutions for technically challenging systems. One such area of development is the design of Pla…