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Title: 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.
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Publication Date:
OSTI Identifier:OSTI ID: 836089
Report Number(s):PPPL-4015
TRN: US0500495
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
Language:English
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