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Abstract

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
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: stacks.iop.org/NF/45/1168
Record Number: 200518340 / Last updated on: 2005-09-26
Category: PUBLICATION
Original language: en
Available languages: en