UKAEA Papers

"Ion-irradiation induced clustering in W-Re-Ta, W-Re and W-Ta alloys: An atom probe tomography and nanoindentation study"

• A. Xu
• D.E.J. Armstrong
• C. Beck
• M. P. Moody
• G. D.W. Smith
• P. A. J. Bagot
• S. G. Roberts

In tungsten plasma-facing fusion reactor components, Ta is the third most abundant element formed by transmutation (after Re and Os), yet little is known about the behaviour of W-Ta alloys under irradiation and any effects Ta might have on Re clustering in W-Re-Ta alloys. In this study, W-4.5 at.%Ta, W-2 at.% Re-1 at.%Ta andW-2 at.%Re alloys were e…

"Ion-irradiation-induced clustering in W–Re and W–Re–Os alloys: A comparative study using atom probe tomography and nanoindentation measurements"

• A. Xu
• C. Beck
• D. E. J. Armstrong
• K. Rajan
• G. D.W. Smith
• P. A. J. Bagot
• S. G. Roberts

This study examines clustering and hardening in W–2 at.% Re and W–1 at.% Re–1 at.% Os alloys induced by 2 MeV W + ion irradiation at 573 and 773 K. Such clusters are known precursors to the formation of embrittling precipitates, a potentially life-limiting phenomenon in the oper- ation of fusion reactor components. Increases in hardness were …

"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

"Overview of the Alcator C-Mod Research Program"

• E.S. Marmar
• A. Bader
• M. Bakhtiari
• H. Barnard
• W. Beck
• I. Bespamyatnov
• A. Binus
• P. Bonoli
• B. Bose
• M. Bitter
• I. Cziegler
• G. Dekow
• et al.

This paper summarizes highlights of research results from the Alcator C-Mod tokamak covering the period 2006 through 2008. Active flow drive, using mode converted waves in the ion cyclotron range of frequencies (ICRF), has been observed for the first time in a tokamak plasma, using a mix of D and 3 He ion species; toroidal and poloidal flows are dr…