Observations of neutral beam and ICRF tail ion losses due to Alfven modes in TFTR

Darrow, D.S.; Zweben, S. J.; Chang, Z.

doi:10.2172/231967

Cited by 3 publications

(5 citation statements)

References 4 publications

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“…Energetic particle loss resulted from TAE instabilities driven by neutral beam injection and ICRF heating but not by alpha particles (Darrow et al, 1996b). The Occurrence of magnetic fluctuations with different toroidal mode numbers is observed.…”

Section: Iters9-pmentioning

confidence: 86%

“…These modes were predicted to be driven unstable by energetic particles through wave-particle resonances by tapping the free energy associated with the energetic alpha pressure gradient (Cheng et al, 1989;Fu and Van Dam 1989;Cheng 1991 instabilities, as shown in Fig. 53, can be sufficiently strong to eject a large fraction of the fast particles (Darrow et al, 1996b) and to damage first wall components .…”

Section: A Toroidal Alfvdn Eigenmodesmentioning

confidence: 99%

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Results from deuterium-tritium tokamak confinement experiments

Hawryluk

1998

Rev. Mod. Phys.

123

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Section: Iters9-pmentioning

confidence: 86%

Section: A Toroidal Alfvdn Eigenmodesmentioning

confidence: 99%

Results from deuterium-tritium tokamak confinement experiments

Hawryluk

1998

Rev. Mod. Phys.

123

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“…Fast ion losses induced by AEs have been measured in tokamak and stellarator/ heliotron devices with the scintillator-based detectors (Darrow et al 1997;Weller et al 2001;Isobe et al 2006;Darrow et al 2008;García-Muñoz et al 2010;Van Zeeland et al 2011;Ogawa et al 2012). The lost particles measured by the detectors on the tokamaks are mainly trapped particles that were originally counter-passing particles to the plasma current, lost energy due to the interaction with the AEs, and became trapped particles.…”

Section: Fast Ion Lossmentioning

confidence: 99%

Introduction to the interaction between energetic particles and Alfven eigenmodes in toroidal plasmas

Todo

2018

Rev. Mod. Plasma Phys.

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This article is a tutorial review of the interaction between energetic particles and Alfvén eigenmodes (AEs) which is one of the important research issues for fusion burning plasmas. The destabilization mechanism of AEs is a kind of inverse Landau damping through the resonant interaction with energetic particles. The important properties of the AE instability, such as resonance condition, conserved variable during the interaction, and particle trapping by the AE, are explained. The time evolution of AEs is classified into various types, steady state, frequency splitting, frequency chirping, and recurrent bursts. Berk and Breizman presented both a onedimensional weakly nonlinear theory for marginal stability and a reduced simulation model that qualitatively explain the various types of time evolution. Berk-Breizman's theory and reduced simulation model are introduced, and their limitations and the future works are discussed in this article. In addition, energetic particle transport by AEs is illustrated with surface-of-section plots. The particle trapping by the AE creates phase space islands and leads to the local flattening of the energetic particle spatial profile. The resonance overlap of multiple AEs and the overlap of higherorder resonances of a single AE lead to the emergence of stochasticity in phase space and the global transport of energetic particles.

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“…These instabilities, as shown in Fig. 53, can be sufficiently strong to eject a large fraction of the fast particles (Darrow et al, 1996b) and to damage first wall components .…”

Section: A Toroidal Alfvdn Eigenmodesmentioning

confidence: 93%

“…Fraction of energetic particles power lost from the plasma and the TAE mode amplitude versus the heating power in TFTR discharges. Energetic particle loss resulted from TAE instabilities driven by neutral beam injection and ICRF heating but not by alpha particles (Darrow et al, 1996b).…”

Section: Fig 40mentioning

confidence: 97%

Results from deuterium-tritium tokamak confinement experiments

Hawryluk¹

1997

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Recent scientific and technical progress in magnetic fusion experiments has resulted in the achievement of plasma parameters (density and temperature) which enabled the production of significant bursts of fusion power from deuterium-tritium fuels and the first studies of the physics of burning plasmas. The key scientific issues in the reacting plasma core are plasma confinement, magnetohydrodynamic (MHD) stability, and the confinement and loss of energetic fusion products from the reacting fuel ions. Progress in the development of regimes of operation which have both good confinement and are MHD stable have enabled a broad study of burning plasma physics issues. A review of the technical and scientific results from the deuterium-tritium experiments on the Joint European Torus (JET) and the Tokamak Fusion Test Reactor (TFTR) is given with particular emphasis on alpha-particle physics issues. DISCLAIMER This report was prepared as an account of work spansored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or respnsi-. bility for the accuracy, completeness, or usefulness of any information, apparatus, p r d u n , or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document.

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Observations of neutral beam and ICRF tail ion losses due to Alfven modes in TFTR

Cited by 3 publications

References 4 publications

Results from deuterium-tritium tokamak confinement experiments

Results from deuterium-tritium tokamak confinement experiments

Introduction to the interaction between energetic particles and Alfven eigenmodes in toroidal plasmas

Results from deuterium-tritium tokamak confinement experiments

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