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In preparation for next step burning plasma devices such as ITER, experimental studies of instabilities and confinement of energetic ions were performed on Joint European Torus (JET) and on Mega-Ampere Spherical Tokamak (MAST) with innovative diagnostic techniques, in conventional and shear-reversed plasmas, exploring a wide range of effects for energetic ions. A compendium of recent results testing capabilities of the present-day facilities for burning plasma relevant study is presented in this paper. �Alpha tail� production using 3rd harmonic ion-cyclotron resonance heating (ICRH) of {4}He beam ions has been employed on JET for studying {4}He of the megaelectronvolt energy range in a �neutron-free� environment. The evolution of ICRH-accelerated ions of {4}He with E > or = 1.7MeV and D with E > or = 500 keV was assessed from nuclear gamma-ray emission born by the fast ions colliding with Be and C impurities. A simultaneous measurement of spatial profiles of fast 4He and fast D ions relevant to ITER was performed for the first time in positive and strongly reversed magnetic shear discharges. Time-resolved gamma-ray diagnostics for ICRH-accelerated 3He and H minority ions allowed changes in the fast ion distribution function to be assessed in the presence of unstable toroidal Alfvén eigenmodes (TAEs) and sawteeth.

Additional information

Authors: SHARAPOV S E etal, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB)
Bibliographic Reference: An article published in: Nuclear Fusion 45 (2005) 1168�1177
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Record Number: 200518340 / Last updated on: 2005-09-26
Original language: en
Available languages: en