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Title: Magnetic island and plasma rotation under external resonant magnetic perturbation in the T-10 tokamak

Abstract

Experimental comparison of the m = 2, n = 1 mode and plasma rotation velocities at q = 2 magnetic surface in a wide range of the mode amplitudes is presented. Phase velocity of the mode rotation is measured with a set of poloidal magnetic field sensors located at the inner side of the vacuum vessel wall. Plasma rotation velocity at the q = 2 magnetic surface in the direction of the mode phase velocity is measured with the heavy ion beam probe diagnostics. In the presence of a static Resonant Magnetic Perturbation (RMP), the rotation is irregular that appears as cyclical variations of the mode and plasma instantaneous velocities. The period of these variations is equal to the period of the mode oscillations. In the case of high mode amplitude, the rotation irregularity of the mode is consistent with the rotation irregularity of the resonant plasma layer. On the contrary, the observed rise of the mode rotation irregularity in the case of low mode amplitude occurs without an increase of the rotation irregularity of the resonant plasma layer. The experimental results are simulated and analyzed with the TEAR code based on the two-fluid MHD approximation. Calculated irregularities of the mode and plasma rotation depend on the modemore » amplitude similar to the experimental data. For large islands, the rotation irregularity is attributed to oscillations of the electromagnetic torque applied to the resonant plasma layer. For small islands, the deviation of the mode rotation velocity from the plasma velocity occurs due to the effect of finite plasma resistivity.« less

Authors:
; ;  [1];  [1]
  1. National Research Centre, “Kurchatov Institute,” 123182 Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
22410317
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPUTERIZED SIMULATION; DISTURBANCES; EXPERIMENTAL DATA; HEAVY IONS; ION BEAMS; MAGNETIC FIELDS; MAGNETIC ISLANDS; MAGNETIC SURFACES; MAGNETOHYDRODYNAMICS; OSCILLATION MODES; PHASE VELOCITY; PLASMA; RADIAL VELOCITY; ROTATING PLASMA; T-10 TOKAMAK; TORQUE

Citation Formats

Eliseev, L. G., Ivanov, N. V., E-mail: ivanov-nv@nrcki.ru, Kakurin, A. M., Perfilov, S. V., Melnikov, A. V., and National Research Nuclear University MEPhI, 115409 Moscow. Magnetic island and plasma rotation under external resonant magnetic perturbation in the T-10 tokamak. United States: N. p., 2015. Web. doi:10.1063/1.4921646.
Eliseev, L. G., Ivanov, N. V., E-mail: ivanov-nv@nrcki.ru, Kakurin, A. M., Perfilov, S. V., Melnikov, A. V., & National Research Nuclear University MEPhI, 115409 Moscow. Magnetic island and plasma rotation under external resonant magnetic perturbation in the T-10 tokamak. United States. https://doi.org/10.1063/1.4921646
Eliseev, L. G., Ivanov, N. V., E-mail: ivanov-nv@nrcki.ru, Kakurin, A. M., Perfilov, S. V., Melnikov, A. V., and National Research Nuclear University MEPhI, 115409 Moscow. 2015. "Magnetic island and plasma rotation under external resonant magnetic perturbation in the T-10 tokamak". United States. https://doi.org/10.1063/1.4921646.
@article{osti_22410317,
title = {Magnetic island and plasma rotation under external resonant magnetic perturbation in the T-10 tokamak},
author = {Eliseev, L. G. and Ivanov, N. V., E-mail: ivanov-nv@nrcki.ru and Kakurin, A. M. and Perfilov, S. V. and Melnikov, A. V. and National Research Nuclear University MEPhI, 115409 Moscow},
abstractNote = {Experimental comparison of the m = 2, n = 1 mode and plasma rotation velocities at q = 2 magnetic surface in a wide range of the mode amplitudes is presented. Phase velocity of the mode rotation is measured with a set of poloidal magnetic field sensors located at the inner side of the vacuum vessel wall. Plasma rotation velocity at the q = 2 magnetic surface in the direction of the mode phase velocity is measured with the heavy ion beam probe diagnostics. In the presence of a static Resonant Magnetic Perturbation (RMP), the rotation is irregular that appears as cyclical variations of the mode and plasma instantaneous velocities. The period of these variations is equal to the period of the mode oscillations. In the case of high mode amplitude, the rotation irregularity of the mode is consistent with the rotation irregularity of the resonant plasma layer. On the contrary, the observed rise of the mode rotation irregularity in the case of low mode amplitude occurs without an increase of the rotation irregularity of the resonant plasma layer. The experimental results are simulated and analyzed with the TEAR code based on the two-fluid MHD approximation. Calculated irregularities of the mode and plasma rotation depend on the mode amplitude similar to the experimental data. For large islands, the rotation irregularity is attributed to oscillations of the electromagnetic torque applied to the resonant plasma layer. For small islands, the deviation of the mode rotation velocity from the plasma velocity occurs due to the effect of finite plasma resistivity.},
doi = {10.1063/1.4921646},
url = {https://www.osti.gov/biblio/22410317}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 22,
place = {United States},
year = {Fri May 15 00:00:00 EDT 2015},
month = {Fri May 15 00:00:00 EDT 2015}
}