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

Title: Transitionless Enhanced Confinement and the Role of Radial Electric Field Shear

Abstract

Evidence for the role of radial electric field shear in enhanced confinement regimes attained without sharp bifurcations or transitions is presented. Temperature scans at constant density, created in the reheat phase following deuterium pellet injection into supershot plasmas in the Tokamak Fusion Test Reactor [J.D. Strachan, et al., Phys. Rev. Lett. 58 (1987) 1004] are simulated using a first-principles transport model. The slow reheat of the ion temperature profile, during which the temperature nearly doubles, is not explained by relatively comprehensive models of transport due to Ion Temperature Gradient Driven Turbulence (ITGDT), which depends primarily on the (unchanging) electron density gradient. An extended model, including the suppression of toroidal ITGDT by self-consistent radial electric field shear, does reproduce the reheat phase.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
14407
Report Number(s):
PPPL-3375
AC02-CHO-3073; TRN: US0111032
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Oct 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; PLASMA CONFINEMENT; DEUTERIUM; ELECTRIC FIELDS; ELECTRON DENSITY; ION TEMPERATURE; PELLET INJECTION; SHEAR; TFTR TOKAMAK; TURBULENCE; TRANSPORT THEORY; TOROIDAL CONFIGURATION

Citation Formats

B. Coppi, D.R. Ernst, M.G. Bell, R.E. Bell, R.V. Budny, and et al. Transitionless Enhanced Confinement and the Role of Radial Electric Field Shear. United States: N. p., 1999. Web. doi:10.2172/14407.
B. Coppi, D.R. Ernst, M.G. Bell, R.E. Bell, R.V. Budny, & et al. Transitionless Enhanced Confinement and the Role of Radial Electric Field Shear. United States. doi:10.2172/14407.
B. Coppi, D.R. Ernst, M.G. Bell, R.E. Bell, R.V. Budny, and et al. Fri . "Transitionless Enhanced Confinement and the Role of Radial Electric Field Shear". United States. doi:10.2172/14407. https://www.osti.gov/servlets/purl/14407.
@article{osti_14407,
title = {Transitionless Enhanced Confinement and the Role of Radial Electric Field Shear},
author = {B. Coppi and D.R. Ernst and M.G. Bell and R.E. Bell and R.V. Budny and et al},
abstractNote = {Evidence for the role of radial electric field shear in enhanced confinement regimes attained without sharp bifurcations or transitions is presented. Temperature scans at constant density, created in the reheat phase following deuterium pellet injection into supershot plasmas in the Tokamak Fusion Test Reactor [J.D. Strachan, et al., Phys. Rev. Lett. 58 (1987) 1004] are simulated using a first-principles transport model. The slow reheat of the ion temperature profile, during which the temperature nearly doubles, is not explained by relatively comprehensive models of transport due to Ion Temperature Gradient Driven Turbulence (ITGDT), which depends primarily on the (unchanging) electron density gradient. An extended model, including the suppression of toroidal ITGDT by self-consistent radial electric field shear, does reproduce the reheat phase.},
doi = {10.2172/14407},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {10}
}