Excitation of Alfvén eigenmodes by fusion-born alpha-particles in D-3He plasmas on JET

V. G. Kiptily; Ye O. Kazakov; M. Nocente; J. Ongena; F. Belli; M. Dreval; T. Craciunescu; J. Eriksson; M. Fitzgerald; L. Giacomelli; V. Goloborodko; M. V. Iliasova; E. M. Khilkevitch; D. Rigamonti; A. Sahlberg; M. Salewski; A. E. Shevelev; J. Garcia; H. J.C. Oliver; S. E. Sharapov; Z. Stancar; H. Weisen

doi:10.1088/1361-6587/ac5d9e

Excitation of Alfvén eigenmodes by fusion-born alpha-particles in D-³He plasmas on JET

V. G. Kiptily, Ye O. Kazakov, M. Nocente, J. Ongena, F. Belli, M. Dreval, T. Craciunescu, J. Eriksson, M. Fitzgerald, L. Giacomelli, V. Goloborodko, M. V. Iliasova, E. M. Khilkevitch, D. Rigamonti, A. Sahlberg, M. Salewski, A. E. Shevelev, J. Garcia, H. J.C. Oliver, S. E. SharapovZ. Stancar, H. Weisen

Laboratory for Plasma Physics

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Abstract

Alfvén 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 Alfvén eigenmodes (EAEs) with mode numbers n = -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 'bump-on-tail' shaped velocity distribution. Linear stability analysis and Fokker-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.

Original language	English
Article number	064001
Journal	Plasma Physics and Controlled Fusion
Volume	64
Issue number	6
DOIs	https://doi.org/10.1088/1361-6587/ac5d9e
Publication status	Published - Jun 2022

Keywords

MHD instabilities
fast-ion diagnostics
fusion-born alpha-particles
tokamak

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10.1088/1361-6587/ac5d9e

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Kiptily, V. G., Kazakov, Y. 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., ... Weisen, H. (2022). Excitation of Alfvén eigenmodes by fusion-born alpha-particles in D-³He plasmas on JET. Plasma Physics and Controlled Fusion, 64(6), Article 064001. https://doi.org/10.1088/1361-6587/ac5d9e

@article{9a8e9d278ff544c99b8a0e1b38b7a794,

title = "Excitation of Alfv{\'e}n eigenmodes by fusion-born alpha-particles in D-3He plasmas on JET",

abstract = "Alfv{\'e}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 Alfv{\'e}n eigenmodes (EAEs) with mode numbers n = -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 'bump-on-tail' shaped velocity distribution. Linear stability analysis and Fokker-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.",

keywords = "MHD instabilities, fast-ion diagnostics, fusion-born alpha-particles, tokamak",

author = "Kiptily, {V. G.} and Kazakov, {Ye O.} and M. Nocente and J. Ongena and F. Belli and M. Dreval and T. Craciunescu and J. Eriksson and M. Fitzgerald and L. Giacomelli and V. Goloborodko and Iliasova, {M. V.} and Khilkevitch, {E. M.} and D. Rigamonti and A. Sahlberg and M. Salewski and Shevelev, {A. E.} and J. Garcia and Oliver, {H. J.C.} and Sharapov, {S. E.} and Z. Stancar and H. Weisen",

note = "Publisher Copyright: {\textcopyright} 2022 Crown copyright. Reproduced with the permission of the Controller of Her Majesty's Stationery Office.",

year = "2022",

month = jun,

doi = "10.1088/1361-6587/ac5d9e",

language = "English",

volume = "64",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

number = "6",

}

Kiptily, VG, Kazakov, YO, Nocente, M, Ongena, J, Belli, F, Dreval, M, Craciunescu, T, Eriksson, J, Fitzgerald, M, Giacomelli, L, Goloborodko, V, Iliasova, MV, Khilkevitch, EM, Rigamonti, D, Sahlberg, A, Salewski, M, Shevelev, AE, Garcia, J, Oliver, HJC, Sharapov, SE, Stancar, Z & Weisen, H 2022, 'Excitation of Alfvén eigenmodes by fusion-born alpha-particles in D-³He plasmas on JET', Plasma Physics and Controlled Fusion, vol. 64, no. 6, 064001. https://doi.org/10.1088/1361-6587/ac5d9e

TY - JOUR

T1 - Excitation of Alfvén eigenmodes by fusion-born alpha-particles in D-3He plasmas on JET

AU - Kiptily, V. G.

AU - Kazakov, Ye O.

AU - Nocente, M.

AU - Ongena, J.

AU - Belli, F.

AU - Dreval, M.

AU - Craciunescu, T.

AU - Eriksson, J.

AU - Fitzgerald, M.

AU - Giacomelli, L.

AU - Goloborodko, V.

AU - Iliasova, M. V.

AU - Khilkevitch, E. M.

AU - Rigamonti, D.

AU - Sahlberg, A.

AU - Salewski, M.

AU - Shevelev, A. E.

AU - Garcia, J.

AU - Oliver, H. J.C.

AU - Sharapov, S. E.

AU - Stancar, Z.

AU - Weisen, H.

PY - 2022/6

Y1 - 2022/6

N2 - Alfvén 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 Alfvén eigenmodes (EAEs) with mode numbers n = -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 'bump-on-tail' shaped velocity distribution. Linear stability analysis and Fokker-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.

AB - Alfvén 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 Alfvén eigenmodes (EAEs) with mode numbers n = -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 'bump-on-tail' shaped velocity distribution. Linear stability analysis and Fokker-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.

KW - MHD instabilities

KW - fast-ion diagnostics

KW - fusion-born alpha-particles

KW - tokamak

UR - http://www.scopus.com/inward/record.url?scp=85129691420&partnerID=8YFLogxK

U2 - 10.1088/1361-6587/ac5d9e

DO - 10.1088/1361-6587/ac5d9e

M3 - Article

AN - SCOPUS:85129691420

SN - 0741-3335

VL - 64

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 6

M1 - 064001

ER -

Excitation of Alfvén eigenmodes by fusion-born alpha-particles in D-³He plasmas on JET

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