Alpha-tail production with ion-cyclotron-resonance heating of 4He-beam ions in JET plasmas
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.
Bibliographic Reference: An article published in: Physical Review Letters, Vol 88, No 10, pp.1050021/1-4 (2002)
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://ojps.aip.org/journal_cgi/dbt?KEY=PRLTAO&Volume=88&Issue=10
Record Number: 200214955 / Last updated on: 2002-07-09
Original language: en
Available languages: en