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Title: Fast particles-wave interaction in the Alfven frequency range on the Joint European Torus tokamak

Abstract

Wave-particle interaction phenomena in the Alfven Eigenmode (AE) frequency range are investigated at the Joint European Torus [P. H. Rebut and B. E. Keen, Fusion Technol. 11, 13 (1987)] using active and passive diagnostic methods. Fast particles are generated by neutral beam injection, ion cyclotron resonance heating, and fusion reactions. External antennas are used to excite stable AEs and measure fast particle drive and damping separately. Comparisons with numerical calculations lead to an identification of the different damping mechanisms. The use of the active AE diagnostic system to generate control signals based on the proximity to marginal stability limits for AE and low-frequency magnetohydrodynamic (MHD) modes is explored. Signatures of the different nonlinear regimes of fast particle driven AE instabilities predicted by theory are found in the measured spectra. The diagnostic use of AE measurements to get information both on the plasma bulk and the fast particle distribution is assessed. (c) 2000 American Institute of Physics.

Authors:
 [1];  [2];  [3];  [4];  [2];  [2];  [5];  [6];  [2];  [2];  [1]
  1. Physics Department and PSFC, MIT, 175 Albany Street, Cambridge, Massachusetts 02139 (United States)
  2. JET Joint Undertaking, Abingdon, OX14 3EA, (United Kingdom)
  3. (Portugal)
  4. Institute for Fusion Studies, University of Texas at Austin, Austin, Texas 78712 (United States)
  5. (United States)
  6. Alfven Laboratory, Royal Institute of Technology, SE-100 44, Stockholm, (Sweden)
Publication Date:
OSTI Identifier:
20216051
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALFVEN WAVES; JET TOKAMAK; MAGNETOHYDRODYNAMICS; ICR HEATING; ION CYCLOTRON-RESONANCE; PLASMA DIAGNOSTICS; PLASMA INSTABILITY; THEORETICAL DATA

Citation Formats

Fasoli, A., Borba, D., Association EURATOM/IST, Av. Rovisto Paris, 1096 Lisbon,, Breizman, B., Gormezano, C., Heeter, R. F., Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543, Juan, A., Mantsinen, M., Sharapov, S., and Testa, D. Fast particles-wave interaction in the Alfven frequency range on the Joint European Torus tokamak. United States: N. p., 2000. Web. doi:10.1063/1.874003.
Fasoli, A., Borba, D., Association EURATOM/IST, Av. Rovisto Paris, 1096 Lisbon,, Breizman, B., Gormezano, C., Heeter, R. F., Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543, Juan, A., Mantsinen, M., Sharapov, S., & Testa, D. Fast particles-wave interaction in the Alfven frequency range on the Joint European Torus tokamak. United States. doi:10.1063/1.874003.
Fasoli, A., Borba, D., Association EURATOM/IST, Av. Rovisto Paris, 1096 Lisbon,, Breizman, B., Gormezano, C., Heeter, R. F., Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543, Juan, A., Mantsinen, M., Sharapov, S., and Testa, D. Mon . "Fast particles-wave interaction in the Alfven frequency range on the Joint European Torus tokamak". United States. doi:10.1063/1.874003.
@article{osti_20216051,
title = {Fast particles-wave interaction in the Alfven frequency range on the Joint European Torus tokamak},
author = {Fasoli, A. and Borba, D. and Association EURATOM/IST, Av. Rovisto Paris, 1096 Lisbon, and Breizman, B. and Gormezano, C. and Heeter, R. F. and Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543 and Juan, A. and Mantsinen, M. and Sharapov, S. and Testa, D.},
abstractNote = {Wave-particle interaction phenomena in the Alfven Eigenmode (AE) frequency range are investigated at the Joint European Torus [P. H. Rebut and B. E. Keen, Fusion Technol. 11, 13 (1987)] using active and passive diagnostic methods. Fast particles are generated by neutral beam injection, ion cyclotron resonance heating, and fusion reactions. External antennas are used to excite stable AEs and measure fast particle drive and damping separately. Comparisons with numerical calculations lead to an identification of the different damping mechanisms. The use of the active AE diagnostic system to generate control signals based on the proximity to marginal stability limits for AE and low-frequency magnetohydrodynamic (MHD) modes is explored. Signatures of the different nonlinear regimes of fast particle driven AE instabilities predicted by theory are found in the measured spectra. The diagnostic use of AE measurements to get information both on the plasma bulk and the fast particle distribution is assessed. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.874003},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 7,
place = {United States},
year = {2000},
month = {5}
}