التفاصيل البيبلوغرافية
| العنوان: |
Excitation of Alfvén eigenmodes by fusion-born alpha-particles in D- 3 He plasmas on JET. |
| المؤلفون: |
Kiptily, V G, Kazakov, Ye O, Nocente, M, Ongena, J, Belli, F, Dreval, M, Craciunescu, T, Eriksson, J, Fitzgerald, M, Giacomelli, L, Goloborodko, V, Iliasova, M V, Khilkevitch, E M, Rigamonti, D, Sahlberg, A, Salewski, M, Shevelev, A E, Garcia, J, Oliver, H J C, Sharapov, S E |
| المصدر: |
Plasma Physics & Controlled Fusion; Jun2022, Vol. 64 Issue 6, p1-15, 15p |
| مصطلحات موضوعية: |
PLASMA jets, NUCLEAR fusion, PLASMA beam injection heating, NEUTRAL beams, RADIO frequency, MAGNETOHYDRODYNAMIC instabilities, PLASMA diagnostics |
| الشركة/الكيان: |
JET Project (Joint European Torus) |
| مستخلص: |
AlfvĂ©n eigenmode (AE) instabilities driven by alpha-particles have been observed in D-3He fusion experiments on the Joint European Torus (JET) with the ITER-like wall. For the efficient generation of fusion alpha-particles from D-3He fusion reaction, the three-ion radio frequency scenario was used to accelerate the neutral beam injection 100 keV deuterons to higher energies in the core of mixed D-3He plasmas at high concentrations of 3He. A large variety of fast-ion driven magnetohydrodynamic modes were observed, including the elliptical AlfvĂ©n eigenmodes (EAEs) with mode numbers n = â'1 and axisymmetric modes with n = 0 in the frequency range of EAEs. The simultaneous observation of these modes indicates the presence of rather strong alpha-particle population in the plasma with a â€bump-on-tail’ shaped velocity distribution. Linear stability analysis and Fokkerâ€"Planck calculations support the observations. Experimental evidence of the AEs excitation by fusion-born alpha-particles in the D-3He plasma is provided by neutron and gamma-ray diagnostics as well as fast-ion loss measurements. We discuss an experimental proposal for the planned full-scale D-T plasma experiments on JET based on the physics insights gained from these experiments. [ABSTRACT FROM AUTHOR] |
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