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 (alpha) particles. Acceleration of 4He ions to the MeV energy range is confirmed by gamma-ray emission from the nuclear reaction 9Be(alpha,ngamma) 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.
Mantsinen
M J
MJ
Helsinki University of Technology, Association Euratom-Tekes, Finland.
Mayoral
M-L
ML
Kiptily
V G
VG
Sharapov
S E
SE
Alper
B
B
Bickley
A
A
de Baar
M
M
Eriksson
L-G
LG
Gondhalekar
A
A
Hellsten
T
T
Lawson
K
K
Nguyen
F
F
Noterdaeme
J-M
JM
Righi
E
E
Tuccillo
A A
AA
Zerbini
M
M