Experimental observation of the geodesic acoustic frequency limit for the NBI-driven Alfvén eigenmodes in TJ-II

L. G. Eliseev; A. V. Melnikov; E. Ascasibar; A. Cappa; M. Drabinskiy; C. Hidalgo; P. O. Khabanov; N. K. Kharchev; A. S. Kozachek; M. Liniers; S. E. Lysenko; M. Ochando; J. L.De Pablos; I. Pastor; S. E. Sharapov; D. A. Spong; B. N. Breizman; J. Varela

doi:10.1063/5.0049225

Experimental observation of the geodesic acoustic frequency limit for the NBI-driven Alfvén eigenmodes in TJ-II

L. G. Eliseev, A. V. Melnikov, E. Ascasibar, A. Cappa, M. Drabinskiy, C. Hidalgo, P. O. Khabanov, N. K. Kharchev, A. S. Kozachek, M. Liniers, S. E. Lysenko, M. Ochando, J. L.De Pablos, I. Pastor, S. E. Sharapov, D. A. Spong, B. N. Breizman, J. Varela

Plasma Theory and Modeling

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Abstract

We study Alfvén eigenmodes (AEs) in the TJ-II heliac in hydrogen plasmas heated by hydrogen co-field neutral beam injector. Taking advantage of the unique TJ-II flexibility in a varying plasma current, we have observed strong variation of the AE frequency from fAE ∼30 to ∼220 kHz for selected modes. An advanced heavy-ion beam probe diagnostic determines the spatial location and internal amplitudes of the modes. The modes satisfy a local AE dispersion relation including the geodesic acoustic frequency that represents the lowest frequency of the mode. Linear MHD modeling with STELLGAP and FAR3D codes shows that the calculated temporal evolution of the mode frequency reproduces the observed maxima and minima at the same time intervals with a similar frequency range, and the radial profile peaks near the outer edge of the observed one.

Original language	English
Article number	072510
Journal	Physics of Plasmas
Volume	28
Issue number	7
DOIs	https://doi.org/10.1063/5.0049225
State	Published - Jul 1 2021

Funding

The work is a result of the long-term cooperation between participating institutes. The research and data analysis done by the Kurchatov team in Secs. II and III were funded by the Russian Science Foundation, Project No. 19-12-00312. J.V. was supported by the Comunidad de Madrid, Grant No. 2019-T1/AMB-13648. The CIEMAT team was supported by the Comunidad de Madrid, Grant No. Y2018/NMT (PROMETEO-CM). B.N.B. was supported by the U.S. Department of Energy Contract No. DEFG02–04ER54742.

Funders	Funder number
U.S. Department of Energy	DEFG02–04ER54742
Comunidad de Madrid	2019-T1/AMB-13648
Russian Science Foundation	19-12-00312

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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Eliseev, L. G., Melnikov, A. V., Ascasibar, E., Cappa, A., Drabinskiy, M., Hidalgo, C., Khabanov, P. O., Kharchev, N. K., Kozachek, A. S., Liniers, M., Lysenko, S. E., Ochando, M., Pablos, J. L. D., Pastor, I., Sharapov, S. E., Spong, D. A., Breizman, B. N., & Varela, J. (2021). Experimental observation of the geodesic acoustic frequency limit for the NBI-driven Alfvén eigenmodes in TJ-II. Physics of Plasmas, 28(7), Article 072510. https://doi.org/10.1063/5.0049225

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title = "Experimental observation of the geodesic acoustic frequency limit for the NBI-driven Alfv{\'e}n eigenmodes in TJ-II",

abstract = "We study Alfv{\'e}n eigenmodes (AEs) in the TJ-II heliac in hydrogen plasmas heated by hydrogen co-field neutral beam injector. Taking advantage of the unique TJ-II flexibility in a varying plasma current, we have observed strong variation of the AE frequency from fAE ∼30 to ∼220 kHz for selected modes. An advanced heavy-ion beam probe diagnostic determines the spatial location and internal amplitudes of the modes. The modes satisfy a local AE dispersion relation including the geodesic acoustic frequency that represents the lowest frequency of the mode. Linear MHD modeling with STELLGAP and FAR3D codes shows that the calculated temporal evolution of the mode frequency reproduces the observed maxima and minima at the same time intervals with a similar frequency range, and the radial profile peaks near the outer edge of the observed one.",

author = "Eliseev, {L. G.} and Melnikov, {A. V.} and E. Ascasibar and A. Cappa and M. Drabinskiy and C. Hidalgo and Khabanov, {P. O.} and Kharchev, {N. K.} and Kozachek, {A. S.} and M. Liniers and Lysenko, {S. E.} and M. Ochando and Pablos, {J. L.De} and I. Pastor and Sharapov, {S. E.} and Spong, {D. A.} and Breizman, {B. N.} and J. Varela",

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Eliseev, LG, Melnikov, AV, Ascasibar, E, Cappa, A, Drabinskiy, M, Hidalgo, C, Khabanov, PO, Kharchev, NK, Kozachek, AS, Liniers, M, Lysenko, SE, Ochando, M, Pablos, JLD, Pastor, I, Sharapov, SE, Spong, DA, Breizman, BN & Varela, J 2021, 'Experimental observation of the geodesic acoustic frequency limit for the NBI-driven Alfvén eigenmodes in TJ-II', Physics of Plasmas, vol. 28, no. 7, 072510. https://doi.org/10.1063/5.0049225

TY - JOUR

T1 - Experimental observation of the geodesic acoustic frequency limit for the NBI-driven Alfvén eigenmodes in TJ-II

AU - Eliseev, L. G.

AU - Melnikov, A. V.

AU - Ascasibar, E.

AU - Cappa, A.

AU - Drabinskiy, M.

AU - Hidalgo, C.

AU - Khabanov, P. O.

AU - Kharchev, N. K.

AU - Kozachek, A. S.

AU - Liniers, M.

AU - Lysenko, S. E.

AU - Ochando, M.

AU - Pablos, J. L.De

AU - Pastor, I.

AU - Sharapov, S. E.

AU - Spong, D. A.

AU - Breizman, B. N.

AU - Varela, J.

PY - 2021/7/1

Y1 - 2021/7/1

N2 - We study Alfvén eigenmodes (AEs) in the TJ-II heliac in hydrogen plasmas heated by hydrogen co-field neutral beam injector. Taking advantage of the unique TJ-II flexibility in a varying plasma current, we have observed strong variation of the AE frequency from fAE ∼30 to ∼220 kHz for selected modes. An advanced heavy-ion beam probe diagnostic determines the spatial location and internal amplitudes of the modes. The modes satisfy a local AE dispersion relation including the geodesic acoustic frequency that represents the lowest frequency of the mode. Linear MHD modeling with STELLGAP and FAR3D codes shows that the calculated temporal evolution of the mode frequency reproduces the observed maxima and minima at the same time intervals with a similar frequency range, and the radial profile peaks near the outer edge of the observed one.

AB - We study Alfvén eigenmodes (AEs) in the TJ-II heliac in hydrogen plasmas heated by hydrogen co-field neutral beam injector. Taking advantage of the unique TJ-II flexibility in a varying plasma current, we have observed strong variation of the AE frequency from fAE ∼30 to ∼220 kHz for selected modes. An advanced heavy-ion beam probe diagnostic determines the spatial location and internal amplitudes of the modes. The modes satisfy a local AE dispersion relation including the geodesic acoustic frequency that represents the lowest frequency of the mode. Linear MHD modeling with STELLGAP and FAR3D codes shows that the calculated temporal evolution of the mode frequency reproduces the observed maxima and minima at the same time intervals with a similar frequency range, and the radial profile peaks near the outer edge of the observed one.

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DO - 10.1063/5.0049225

M3 - Article

AN - SCOPUS:85111358351

SN - 1070-664X

VL - 28

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 7

M1 - 072510

ER -

Experimental observation of the geodesic acoustic frequency limit for the NBI-driven Alfvén eigenmodes in TJ-II

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