UKAEA Papers

"Energetic particles in spherical tokamak plasmas"

• K.G. McClements
• E.D. Fredrickson

Spherical tokamaks (STs) typically have lower magnetic fields than conventional tokamaks, but similar mass densities. Suprathermal ions with relatively modest energies, in particular beam-injected ions, consequently have speeds close to or exceeding the Alfven velocity, and can therefore excite a range of Alfvenic instabilities. STs heated with neu…

"Energetic Particle Instabilities in Fusion Plasmas"

• S.E. Sharapov
• B. Alper
• H.L. Berk
• D.N. Borba
• B.N. Breizman
• C.D. Challis
• I.G.J. Classen
• E.M. Edlund
• J. Eriksson
• A. Fasoli
• E.D. Fredrickson
• Et Al

Remarkable progress has been made in diagnosing energetic particle instabilities on present-day machines and in establishing a theoretical framework for describing them. This overview describes the much improved diagnostics of Alfven instabilities and modelling tools developed world-wide, and discusses progress in interpreting the observed phenomen…

"Bursts of electron cyclotron emission during disruptions of high beta discharges in the Tokamak Fusion Test Reactor tokamak"

• A. Janos
• K. Mcguire
• E. Fredrickson
• W. Parks
• S. Zweben
• et al.