Abstract/Details

SATURATED TEARING MODES IN LOW ASPECT RATIO TOKAMAKS

MORRIS, ROBERT NOEL.  Georgia Institute of Technology. ProQuest Dissertations Publishing, 1984. 8411318.

Abstract (summary)

A quasilinear perturbation analysis of the time independent MHD equations has lead to the formulation of a set of equations suitable for the study of saturated tearing modes. The quasilinear analysis allows the effects of the magnetic island on the background equilibrium to be modelled in a self consistant way in a toroidal plasma of arbitrary aspect ratio, beta, and cross section.

The most important finding of this study is the effect of the current density profile within a magnetic island vs the width of a magnetic island. "Peaking" or "anti-peaking" the current density profile within a magentic island can cause large differences in the saturated magnetic island width; furthermore the width of the magnetic island is found to be sensitive to this parameter.

Modification of the background current density profile by the presence of multiple islands can and does cause nonlinear destabilization of magnetic islands; also toroidicity and elongation are shown to have a linear coupling effect that can also destabilize otherwise stable magnetic islands. By themselves, toroidicity and elongation are shown to modestly reduce the saturated magnetic island width and a general trend of smaller magnetic island width with the inward shift of the mode rational surface is noted.

Indexing (details)


Subject
Fluid dynamics;
Gases
Classification
0759: Fluid dynamics
0759: Gases
Identifier / keyword
Pure sciences
Title
SATURATED TEARING MODES IN LOW ASPECT RATIO TOKAMAKS
Author
MORRIS, ROBERT NOEL
Number of pages
146
Degree date
1984
School code
0078
Source
DAI-B 45/02, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9798662255296
University/institution
Georgia Institute of Technology
University location
United States -- Georgia
Degree
Ph.D.
Source type
Dissertation or Thesis
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
8411318
ProQuest document ID
303294192
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
https://www.proquest.com/docview/303294192/abstract