All Papers - UKAEA Scientific Publications

Showing 21 - 30 of 61 UKAEA Paper Results

CLM P1051966

"Plasma confinement during a period of reduced fluctuations in zeta"
- A Gibson
- H Coxell
- BA Powell
- GW Reid
- Preprint
CLM P21961

"Energy loss processes in zeta"
- A Gibson
- DW Mason
- Preprint
UKAEA-CCFE-PR(19)622019

"Isotope dependence of the type I ELMy H-mode pedestal in JET-ILW Hydrogen and Deuterium plasmas"
- L. Horvath
- C.F. Maggi
- A. Chankin
- S. Saarelma
- A.R. Field
- E. Belonohy
- A. Boboc
- G. Corrigan
- E.G. Delabie
- J. Flanagan
- L. Frassinetti
- C. Giroud
- D. Harting
- D. Keeling
- D. King
- M. Maslov
- G.F. Matthews
- S. Menmuir
- S.A. Silburn
- J. Simpson
- A.C.C Sips
- H. Weisen
- K.J. Gibson
- JET Contributors
The pedestal structure, ELM losses and linear MHD stability are analysed in a series of JET-ILW H and D type I ELMy H-mode plasmas. The pedestal pressure (pPED) is typically higher in D than in H at the same input power, with the difference mainly due to lower density in H than in D. At the same input power, the pedestal electron pres…
- Preprint
- Published
UKAEA-CCFE-PR(19)512019

"Effects of Neutron Irradiation on the Brittle to Ductile Transition in Single Crystal Tungsten"
Only limited data exist on the effect of neutron irradiation on the brittle to ductile transition (BDT) in tungsten. This work investigates the increase in brittle to ductile transition temperature (BDTT) following neutron irradiation to 1.67 displacements per atom, using four-point bend tests over a range of temperatures (623 – 1173 K) and strai…
- Preprint
- Published
UKAEA-CCFE-CP(18)032018

"Overview of MAST and first physics results from MAST Upgrade"
- James Harrison
- RJ Akers
- SY Allan
- JS Allcock
- JO Allen
- L Appel
- M Barnes
- N Ben Ayed
- W Boeglin
- C Bowman
- J Bradley
- P Browning
- P Bryant
- M Carr
- M Cecconello
- CD Challis
- S Chapman
- IT Chapman
- GJ Colyer
- S Conroy
- NJ Conway
- M Cox
- G Cunningham
- RO Dendy
- W Dorland
- BD Dudson
- L Easy
- SD Elmore
- T Farley
- X Feng
- AR Field
- A Fil
- GM Fishpool
- M Fitzgerald
Recent results from MAST address key physics issues for ITER operations and the design of future devices, by advancing our understanding of through analysis of high-resolution data and numerical modelling. Modelling of the interaction between filaments with BOUT++ indicates filaments separated by more than 5x their width move independently, and …
- Published
UKAEA-CCFE-PR(19)132018

"A Scale-Separated Approach for Studying Coupled Ion and Electron Scale Turbulence and Cross-Scale Interaction"
Multiple space and time scales arise in plasma turbulence in magnetic confinement fusion devices because of the smallness of the square root of the electron-to-ion mass ratio and the consequent disparity of the ion and electron thermal gyroradii and thermal speeds. Direct simulations of this turbulence that include both ion and electron space-ti…
- Preprint
- Published
UKAEA-CCFE-PR(18)32018

"Inter-ELM evolution of the edge current density in JET-ILW type I ELMy H-mode plasmas"
Recent studies have shown that on JET with the Be/W ITER-like wall (JET-ILW) in high beta discharges with high D2 gas rates the inter-ELM temperature pedestal growth is saturated half way through the ELM cycle, leading to plasmas with reduced confinement, and that the linear MHD stability of these pedestals is inconsistent with the Peeling-Ballooni…
- Preprint
- Published
CCFE-PR(16)482016

"Collisionality scaling of the electron heat flux in ETG turbulence"
In electrostatic simulations of MAST plasma at electron-gyroradius scales, using the local flux-tube gyrokinetic code GS2 with adiabatic ions, we find that the longtime saturated electron heat flux (the level most relevant to energy transport) decreases as the electron collisionality decreases. At early simulation times, the heat flux quasisatura…
- Preprint
- Published
CCFE-PR(16)282016

"Poloidal Tilting Symmetry of High Order Tokamak Flux Surface Shaping in Gyrokinetics"
A poloidal tilting symmetry of the local nonlinear _f gyrokinetic model is demonstrated analytically and verified numerically. This symmetry shows that poloidally rotating all the flux surface shaping effects with large poloidal mode number by a single tilt angle has an exponentially small effect on the transport properties of a tokamak. This is sh…
- Preprint
- Published
CCFE-PR(16)242016

"Deposition in the Inner and Outer Corners of the JET Divertor with Carbon Wall and Metallic ITER-like Wall"
Rotating collectors and quartz microbalances (QMBs) are used in JET to provide time-dependent measurements of erosion and deposition. Rotation of collector discs behind apertures allows recording of the long term evolution of deposition. QMBs measure mass change via the frequency deviations of vibrating quartz crystals. These diagnostics are used t…
- Preprint
- Published

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UKAEA Papers

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"Plasma confinement during a period of reduced fluctuations in zeta"

"Energy loss processes in zeta"

"Isotope dependence of the type I ELMy H-mode pedestal in JET-ILW Hydrogen and Deuterium plasmas"

"Effects of Neutron Irradiation on the Brittle to Ductile Transition in Single Crystal Tungsten"

"Overview of MAST and first physics results from MAST Upgrade"

"A Scale-Separated Approach for Studying Coupled Ion and Electron Scale Turbulence and Cross-Scale Interaction"

"Inter-ELM evolution of the edge current density in JET-ILW type I ELMy H-mode plasmas"

"Collisionality scaling of the electron heat flux in ETG turbulence"

"Poloidal Tilting Symmetry of High Order Tokamak Flux Surface Shaping in Gyrokinetics"

"Deposition in the Inner and Outer Corners of the JET Divertor with Carbon Wall and Metallic ITER-like Wall"