skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Internal Kink Mode Dynamics in High-{beta} NSTX Plasmas

Abstract

Saturated internal kink modes have been observed in many of the highest toroidal beta discharges of the National Spherical Torus Experiment (NSTX). These modes often cause rotation flattening in the plasma core, can degrade energy confinement, and in some cases contribute to the complete loss of plasma angular momentum and stored energy. Characteristics of the modes are measured using soft X-ray, kinetic profile, and magnetic diagnostics. Toroidal flows approaching Alfvenic speeds, island pressure peaking, and enhanced viscous and diamagnetic effects associated with high-beta may contribute to mode nonlinear stabilization. These saturation mechanisms are investigated for NSTX parameters and compared to experimental data.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., Princeton, NJ (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
836571
Report Number(s):
PPPL-4036
TRN: US0500636
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 22 Dec 2004
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANGULAR MOMENTUM; CONFINEMENT; ISLANDS; KINETICS; PLASMA; ROTATION; SATURATION; STABILIZATION; STORED ENERGY; HIGH-BETA PLASMAS; KINK INSTABILITY; NONLINEAR EFFECTS

Citation Formats

J.E. Menard, R.E. Bell, E.D. Fredrickson, D.A. Gates, S.M. Kaye, B.P. LeBlanc, S.S. Medley, W. Park, S.A. Sabbagh, A. Sontag, D. Stutman, K. Tritz, W. Zhu, and the NSTX Research Team. Internal Kink Mode Dynamics in High-{beta} NSTX Plasmas. United States: N. p., 2004. Web. doi:10.2172/836571.
J.E. Menard, R.E. Bell, E.D. Fredrickson, D.A. Gates, S.M. Kaye, B.P. LeBlanc, S.S. Medley, W. Park, S.A. Sabbagh, A. Sontag, D. Stutman, K. Tritz, W. Zhu, & the NSTX Research Team. Internal Kink Mode Dynamics in High-{beta} NSTX Plasmas. United States. doi:10.2172/836571.
J.E. Menard, R.E. Bell, E.D. Fredrickson, D.A. Gates, S.M. Kaye, B.P. LeBlanc, S.S. Medley, W. Park, S.A. Sabbagh, A. Sontag, D. Stutman, K. Tritz, W. Zhu, and the NSTX Research Team. Wed . "Internal Kink Mode Dynamics in High-{beta} NSTX Plasmas". United States. doi:10.2172/836571. https://www.osti.gov/servlets/purl/836571.
@article{osti_836571,
title = {Internal Kink Mode Dynamics in High-{beta} NSTX Plasmas},
author = {J.E. Menard and R.E. Bell and E.D. Fredrickson and D.A. Gates and S.M. Kaye and B.P. LeBlanc and S.S. Medley and W. Park and S.A. Sabbagh and A. Sontag and D. Stutman and K. Tritz and W. Zhu and the NSTX Research Team},
abstractNote = {Saturated internal kink modes have been observed in many of the highest toroidal beta discharges of the National Spherical Torus Experiment (NSTX). These modes often cause rotation flattening in the plasma core, can degrade energy confinement, and in some cases contribute to the complete loss of plasma angular momentum and stored energy. Characteristics of the modes are measured using soft X-ray, kinetic profile, and magnetic diagnostics. Toroidal flows approaching Alfvenic speeds, island pressure peaking, and enhanced viscous and diamagnetic effects associated with high-beta may contribute to mode nonlinear stabilization. These saturation mechanisms are investigated for NSTX parameters and compared to experimental data.},
doi = {10.2172/836571},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 22 00:00:00 EST 2004},
month = {Wed Dec 22 00:00:00 EST 2004}
}

Technical Report:

Save / Share: