Transition from chirping to steady NBI-driven Alfvén modes caused by magnetic configuration variations in the TJ-II stellarator

A. V. Melnikov; L. G. Eliseev; E. Ascasíbar; A. Cappa; F. Castejón; C. Hidalgo; T. Ido; J. A. Jiménez; A. S. Kozachek; L. I. Krupnik; M. Liniers; S. E. Lysenko; K. Nagaoka; J. L. De Pablos; A. Shimizu; S. E. Sharapov; M. V. Ufimtsev; S. Yamamoto

doi:10.1088/0029-5515/56/7/076001

Transition from chirping to steady NBI-driven Alfvén modes caused by magnetic configuration variations in the TJ-II stellarator

A. V. Melnikov, L. G. Eliseev, E. Ascasíbar, A. Cappa, F. Castejón, C. Hidalgo, T. Ido, J. A. Jiménez, A. S. Kozachek, L. I. Krupnik, M. Liniers, S. E. Lysenko, K. Nagaoka, J. L. De Pablos, A. Shimizu, S. E. Sharapov, M. V. Ufimtsev, S. Yamamoto

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Abstract

Beam-driven Alfvén eigenmodes (AEs) have been studied in the TJ-II low-magnetic-shear flexible heliac (B ₀ = 0.95 T, R = 1.5 m, a = 0.22 m), in L-mode hydrogen plasmas with hydrogen NBI and ECR heating (P _NBI 1.0 MW, E _NBI = 32 keV, P _ECRH 0.6 MW). In low-density plasmas in the range = (0.3-1.5) ×10¹⁹ m^-3, a large variety of AEs have been observed in the plasma core with the heavy ion beam probe diagnostic and Mirnov coils, in the frequency range 50 kHz < f _AE < 380 kHz. In experiments in which the vacuum rotational transform is varied during the shot (dynamic configuration scan), some AEs exhibit changes in their nonlinear evolution from bursting-amplitude AEs with chirping frequency to steady-frequency AEs, and back. The range of intervals within which the AEs studied are chirping or steady-state is determined.

Original language	English
Article number	076001
Journal	Nuclear Fusion
Volume	56
Issue number	7
DOIs	https://doi.org/10.1088/0029-5515/56/7/076001
Publication status	Published - Jun 3 2016
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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Melnikov, A. V., Eliseev, L. G., Ascasíbar, E., Cappa, A., Castejón, F., Hidalgo, C., Ido, T., Jiménez, J. A., Kozachek, A. S., Krupnik, L. I., Liniers, M., Lysenko, S. E., Nagaoka, K., De Pablos, J. L., Shimizu, A., Sharapov, S. E., Ufimtsev, M. V., & Yamamoto, S. (2016). Transition from chirping to steady NBI-driven Alfvén modes caused by magnetic configuration variations in the TJ-II stellarator. Nuclear Fusion, 56(7), Article 076001. https://doi.org/10.1088/0029-5515/56/7/076001

Melnikov, AV, Eliseev, LG, Ascasíbar, E, Cappa, A, Castejón, F, Hidalgo, C, Ido, T, Jiménez, JA, Kozachek, AS, Krupnik, LI, Liniers, M, Lysenko, SE, Nagaoka, K, De Pablos, JL, Shimizu, A, Sharapov, SE, Ufimtsev, MV & Yamamoto, S 2016, 'Transition from chirping to steady NBI-driven Alfvén modes caused by magnetic configuration variations in the TJ-II stellarator', Nuclear Fusion, vol. 56, no. 7, 076001. https://doi.org/10.1088/0029-5515/56/7/076001

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title = "Transition from chirping to steady NBI-driven Alfv{\'e}n modes caused by magnetic configuration variations in the TJ-II stellarator",

abstract = "Beam-driven Alfv{\'e}n eigenmodes (AEs) have been studied in the TJ-II low-magnetic-shear flexible heliac (B 0 = 0.95 T, R = 1.5 m, a = 0.22 m), in L-mode hydrogen plasmas with hydrogen NBI and ECR heating (P NBI 1.0 MW, E NBI = 32 keV, P ECRH 0.6 MW). In low-density plasmas in the range = (0.3-1.5) ×1019 m-3, a large variety of AEs have been observed in the plasma core with the heavy ion beam probe diagnostic and Mirnov coils, in the frequency range 50 kHz < f AE < 380 kHz. In experiments in which the vacuum rotational transform is varied during the shot (dynamic configuration scan), some AEs exhibit changes in their nonlinear evolution from bursting-amplitude AEs with chirping frequency to steady-frequency AEs, and back. The range of intervals within which the AEs studied are chirping or steady-state is determined.",

author = "Melnikov, {A. V.} and Eliseev, {L. G.} and E. Ascas{\'i}bar and A. Cappa and F. Castej{\'o}n and C. Hidalgo and T. Ido and Jim{\'e}nez, {J. A.} and Kozachek, {A. S.} and Krupnik, {L. I.} and M. Liniers and Lysenko, {S. E.} and K. Nagaoka and {De Pablos}, {J. L.} and A. Shimizu and Sharapov, {S. E.} and Ufimtsev, {M. V.} and S. Yamamoto",

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doi = "10.1088/0029-5515/56/7/076001",

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AU - Melnikov, A. V.

AU - Eliseev, L. G.

AU - Ascasíbar, E.

AU - Cappa, A.

AU - Castejón, F.

AU - Hidalgo, C.

AU - Ido, T.

AU - Jiménez, J. A.

AU - Kozachek, A. S.

AU - Krupnik, L. I.

AU - Liniers, M.

AU - Lysenko, S. E.

AU - Nagaoka, K.

AU - De Pablos, J. L.

AU - Shimizu, A.

AU - Sharapov, S. E.

AU - Ufimtsev, M. V.

AU - Yamamoto, S.

PY - 2016/6/3

Y1 - 2016/6/3

N2 - Beam-driven Alfvén eigenmodes (AEs) have been studied in the TJ-II low-magnetic-shear flexible heliac (B 0 = 0.95 T, R = 1.5 m, a = 0.22 m), in L-mode hydrogen plasmas with hydrogen NBI and ECR heating (P NBI 1.0 MW, E NBI = 32 keV, P ECRH 0.6 MW). In low-density plasmas in the range = (0.3-1.5) ×1019 m-3, a large variety of AEs have been observed in the plasma core with the heavy ion beam probe diagnostic and Mirnov coils, in the frequency range 50 kHz < f AE < 380 kHz. In experiments in which the vacuum rotational transform is varied during the shot (dynamic configuration scan), some AEs exhibit changes in their nonlinear evolution from bursting-amplitude AEs with chirping frequency to steady-frequency AEs, and back. The range of intervals within which the AEs studied are chirping or steady-state is determined.

AB - Beam-driven Alfvén eigenmodes (AEs) have been studied in the TJ-II low-magnetic-shear flexible heliac (B 0 = 0.95 T, R = 1.5 m, a = 0.22 m), in L-mode hydrogen plasmas with hydrogen NBI and ECR heating (P NBI 1.0 MW, E NBI = 32 keV, P ECRH 0.6 MW). In low-density plasmas in the range = (0.3-1.5) ×1019 m-3, a large variety of AEs have been observed in the plasma core with the heavy ion beam probe diagnostic and Mirnov coils, in the frequency range 50 kHz < f AE < 380 kHz. In experiments in which the vacuum rotational transform is varied during the shot (dynamic configuration scan), some AEs exhibit changes in their nonlinear evolution from bursting-amplitude AEs with chirping frequency to steady-frequency AEs, and back. The range of intervals within which the AEs studied are chirping or steady-state is determined.

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Transition from chirping to steady NBI-driven Alfvén modes caused by magnetic configuration variations in the TJ-II stellarator

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