Observation of Energetic Particle Driven Modes Relevant to Advanced Tokamak Regimes
Observation of Energetic Particle Driven Modes Relevant to Advanced Tokamak Regimes Measurements of high-frequency oscillations in JET [Joint European Torus], JT-60U, Alcator C-Mod, DIII-D, and TFTR [Tokamak Fusion Test Reactor] plasmas are contributing to a new understanding of fast ion-driven instabilities relevant to Advanced Tokamak (AT) regimes. A model based on the transition from a cylindrical-like frequency-chirping mode to the Toroidal Alfven Eigenmode (TAE) has successfully encompassed many of the characteristics seen in experiments. In a surprising development, the use of internal density fluctuation diagnostics has revealed many more modes than has been detected on edge magnetic probes. A corollary discovery is the observation of modes excited by fast particles traveling well below the Alfven velocity. These observations open up new opportunities for investigating a ''sea of Alfven Eigenmodes'' in present-scale experiments, and highlight the need for core fluctuation and fast ion measurements in a future burning-plasma experiment.
|Authors:||; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »|
|OSTI Identifier:||OSTI ID: 836089|
|DOE Contract Number:||AC02-76CH03073|
|Resource Type:||Technical Report|
|Resource Relation:||Other Information: PBD: 21 Oct 2004|
|Research Org:||Princeton Plasma Physics Lab., Princeton, NJ (US)|
|Sponsoring Org:||USDOE Office of Science (SC) (US)|
|Country of Publication:||United States|
|Subject:||22 GENERAL STUDIES OF NUCLEAR REACTORS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; FLUCTUATIONS; MAGNETIC PROBES; OSCILLATIONS; TEST REACTORS; VELOCITY ALFVEN WAVES; ALPHA PARTICLES; MHD INSTABILITY; MICROWAVES|
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