Abstract/Details

Analysis of rotation experiments in TFTR

Pautasso, Gabriella.  Georgia Institute of Technology. ProQuest Dissertations Publishing, 1992. 9223791.

Abstract (summary)

The study of momentum confinement is a valuable means of investigating the mechanisms governing confinement in tokamak plasmas. A dedicated rotation experiment was conducted in TFTR, in September 1988, employing the recently installed CHERS diagnostic. Shots at different values of plasma current, magnetic field, injected beam power and injection direction were made, to study the parametric dependence of local fluxes of momentum and energy.

This Thesis is focused on the study of momentum confinement. Its purposes are to analyze the data of the TFTR rotation experiment, to document the results and to compare the experimental results with the predictions of neoclassical and anomalous momentum transport theories. Particular attention is devoted to the evaluation of the magnitude of the poloidal variation of densities and rotation frequencies that determine the magnitude of the gyroviscous momentum flux.

We find that: (1) Ware's cold ions theory underpredicts the observed viscosity by a few orders of magnitude; (2) each of the anomalous theories considered predicted torque flows which show magnitudes, radial profiles and parametric dependencies on plasma parameters different from those of the experimental torque flow; (3) up-down poloidal asymmetries of density and rotation frequency, evaluated with a model which neglects heat flux and includes the effect of anomalous particle fluxes, are found to be much smaller than $\epsilon$; (4) the gyroviscous torque is at least one order of magnitude smaller than the experimental torque flow.

Indexing (details)


Subject
Fluid dynamics;
Gases;
Nuclear physics
Classification
0759: Fluid dynamics
0759: Gases
0552: Nuclear physics
Identifier / keyword
Applied sciences; Pure sciences
Title
Analysis of rotation experiments in TFTR
Author
Pautasso, Gabriella
Number of pages
221
Degree date
1992
School code
0078
Source
DAI-B 53/04, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Advisor
Stacey, W. M.
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
9223791
ProQuest document ID
303969653
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
https://www.proquest.com/docview/303969653/abstract