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

Journal Article · Mon May 01 04:00:00 EDT 2000 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.874003· OSTI ID:20216051

Fasoli, A ^[1]; Borba, D ^[2]; Breizman, B ^[3]; Gormezano, C ^[2]; Heeter, R F ^[2]; Juan, A ^[4]; Mantsinen, M ^[2]; Sharapov, S ^[2]; Testa, D ^[1]

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1. Physics Department and PSFC, MIT, 175 Albany Street, Cambridge, Massachusetts 02139 (United States)
2. JET Joint Undertaking, Abingdon, OX14 3EA, (United Kingdom)
3. Institute for Fusion Studies, University of Texas at Austin, Austin, Texas 78712 (United States)
4. Alfven Laboratory, Royal Institute of Technology, SE-100 44, Stockholm, (Sweden)

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.

• OSTI ID: 20216051
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 7; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
ICR HEATING
ION CYCLOTRON-RESONANCE
JET TOKAMAK
MAGNETOHYDRODYNAMICS
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
THEORETICAL DATA