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Third-harmonic ion-cyclotron-resonance heating of 4He-beam ions has produced for the first time on the JET tokamak high-energy populations of 4He ions to simulate 3.5 MeV fusion-born alpha particles. Acceleration of 4He ions to the MeV energy range is confirmed by gamma-ray emission from the nuclear reaction 9Be(alpha, n gamma) 12C and excitation of Alfvén eigenmodes. Concomitant electron heating and sawtooth stabilization are observed. The scheme could be used in next-step tokamaks to gain information on trapped alpha particles and to test alpha diagnostics in the early nonactivated phase of operation.

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Authors: MANTSINEN M J, Helsinki University of Technology, Association Euratom-Tekes, Espoo (FI);MAYORAL M-J ET AL, Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ERIKSSON L-G, Association EURATOM-CEA, CEA-Cadarache, Saint-Paul-Lez Durance (FR);NGUYEN F, Association EURATOM-CEA, CEA-Cadarache, Saint-Paul-Lez Durance (FR);DE BAUR M, FOM-Rijnhuizen, Association Euratom-FOM, TEC, Nieuwegein (NL);HELLSTEN T, Euratom-VR ssociation, Swedish Research Council, Stockholm (SE);NOTERDAEME J-M, Max-Planck IPP-EURATOM Assoziation, Garching (DE);RIGHI E, EFDA CSU-Garching, Garching (DE);TUCCILLO A A, Associazione EURATOM-ENEA sulla Fusione, Frascati, Rome (IT);ZERBINI M, Associazione EURATOM-ENEA sulla Fusione, Frascati, Rome (IT)
Bibliographic Reference: An article published in: Physical Review Letters, Vol 88, No 10, pp.1050021/1-4 (2002)
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Record Number: 200214955 / Last updated on: 2002-07-09
Original language: en
Available languages: en
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