UKAEA Papers

"First Access to ELM-free Negative Triangularity at Low Aspect Ratio"

• A.O. Nelson
• C. Vincent
• H. Anand
• J. Lovell
• J.F. Parisi
• H. S. Wilson
• K. Imada
• W.P. Wehner
• M.Kochan
• S. Blackmore
• G. McArdle
• S. Guizzo
• L. Rondini
• S. Freiberger
• C. Paz-Soldan
• the MAST-U Team

A plasma scenario with negative triangularity (NT) shaping is achieved on MAST-U for the first time. While edge localized modes (ELMs) are eventually suppressed as the triangularity is decreased below δ ≲ −0.06, an extended period of H-mode operation with Type-III ELMs is sustained at less negative δ even through access to the second stabilit…

"Lattice Swelling and Modulus Change in a Helium- Implanted Tungsten Alloy: X-ray Micro-Diffraction, Surface Acoustic Wave Measurements, and Multiscale modelling"

• F. Hofmann
• D. Nguyen-Manh
• C.E. Beck
• J.K.Eliason
• M.R. Gilbert
• A.A. Maznev
• W. Liu
• D.E.J. Armstrong
• K.A. Nelson
• S.L. Dudarev

"A high-resolution soft x-ray spectrometer on the MAST tokamak"

• M. J. Nelson
• R. Barnsley
• F. Keenan
• H. Meyer
• C. A. Bunting
• P. G. Carolan
• N. J. Conway
• G. Cunningham
• I. Lehane
• M. R. Tournianski

A curved crystal spectrometer in Johann configuration has been implemented on MAST to obtain values for electron temperature, ion temperature and toroidal velocity. The spectrometer is used to examine medium Z impurities in the soft x-ray region by utilising a Silicon ( 111 ) crystal, bent using a 4 pin bending jig, and a CCD detector sD t =8 ms d …