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Title: Stability Properties of Toroidal Alfven Modes Driven by Fast Particles

Abstract

In this report, the issues of Alfven mode stability in advanced tokamak regimes are addressed based on recent developments in theory, computational methods, and progress in experiments. The instability of Toroidal Alfven Eigenmodes (TAE) is analyzed for spherical tokamaks, such as the National Spherical Torus Experiment NSTX at the Princeton Plasma Physics Laboratory using the NOVA-K code. Chirping modes in the Alfven frequency range observed in JT-60U during the NNBI heating at energies eb0= 360keV, and in the Tokamak Fusion Test Reactor (TFTR) at the Princeton Plasma Physics Laboratory during Ion Cyclotron Resonance Heating (ICRH) experiments, are analyzed using the kinetic nonperturbative code HINST, which is able to resolve new resonant branches of the toroidal Alfven modes called resonant TAE (RTAE). However, the chirping mechanism may be different for different experiments. In TFTR frequency chirping results from the slow variation of the q-profile between sawteeth. In Japan Atomic Energy Research Institute Tokamak (JT-60U) experiments some frequency chirping modes have very short time scale which suggests the cause is due to the change in the fast particle distribution.

Authors:
; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
14762
Report Number(s):
PPPL-3391
TRN: US0106785
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Nov 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALFVEN WAVES; FREQUENCY RANGE; ICR HEATING; INSTABILITY; TFTR TOKAMAK; NSTX DEVICE; N CODES; H CODES; FREQUENCY DEPENDENCE; JT-60U TOKAMAK; OSCILLATION MODES

Citation Formats

Cheng, C Z, Hill, K, Gorelenkov, N N, Bernabei, S, and et al. Stability Properties of Toroidal Alfven Modes Driven by Fast Particles. United States: N. p., 1999. Web. doi:10.2172/14762.
Cheng, C Z, Hill, K, Gorelenkov, N N, Bernabei, S, & et al. Stability Properties of Toroidal Alfven Modes Driven by Fast Particles. United States. doi:10.2172/14762.
Cheng, C Z, Hill, K, Gorelenkov, N N, Bernabei, S, and et al. Mon . "Stability Properties of Toroidal Alfven Modes Driven by Fast Particles". United States. doi:10.2172/14762. https://www.osti.gov/servlets/purl/14762.
@article{osti_14762,
title = {Stability Properties of Toroidal Alfven Modes Driven by Fast Particles},
author = {Cheng, C Z and Hill, K and Gorelenkov, N N and Bernabei, S and et al},
abstractNote = {In this report, the issues of Alfven mode stability in advanced tokamak regimes are addressed based on recent developments in theory, computational methods, and progress in experiments. The instability of Toroidal Alfven Eigenmodes (TAE) is analyzed for spherical tokamaks, such as the National Spherical Torus Experiment NSTX at the Princeton Plasma Physics Laboratory using the NOVA-K code. Chirping modes in the Alfven frequency range observed in JT-60U during the NNBI heating at energies eb0= 360keV, and in the Tokamak Fusion Test Reactor (TFTR) at the Princeton Plasma Physics Laboratory during Ion Cyclotron Resonance Heating (ICRH) experiments, are analyzed using the kinetic nonperturbative code HINST, which is able to resolve new resonant branches of the toroidal Alfven modes called resonant TAE (RTAE). However, the chirping mechanism may be different for different experiments. In TFTR frequency chirping results from the slow variation of the q-profile between sawteeth. In Japan Atomic Energy Research Institute Tokamak (JT-60U) experiments some frequency chirping modes have very short time scale which suggests the cause is due to the change in the fast particle distribution.},
doi = {10.2172/14762},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {11}
}