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

Title: Transition physics and scaling overview

Abstract

This paper presents an overview of recent experimental progress towards understanding H-mode transition physics and scaling. Terminology and techniques for studying H-mode are reviewed and discussed. The model of shear E x B flow stabilization of edge fluctuations at the L-H transition is gaining wide acceptance and is further supported by observations of edge rotation on a number of new devices. Observations of poloidal asymmetries of edge fluctuations and dephasing of density and potential fluctuations after the transition pose interesting challenges for understanding H-mode physics. Dedicated scans to determine the scaling of the power threshold have now been performed on many machines. A dear B{sub t} dependence is universally observed but dependence on the line averaged density is complicated. Other dependencies are also reported. Studies of the effect of neutrals and error fields on the power threshold are under investigation. The ITER threshold database has matured and offers guidance to the power threshold scaling issues relevant to next-step devices.

Authors:
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
192512
Report Number(s):
GA-A22191; CONF-9509238-6
ON: DE96005251; TRN: 96:006424
DOE Contract Number:  
AC03-89ER51114
Resource Type:
Conference
Resource Relation:
Conference: IAEA technical committee meeting/ US-Japan workshop on H-mode physics, Princeton, NJ (United States), 18-20 Sep 1995; Other Information: PBD: Dec 1995
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; DOUBLET-3 DEVICE; H-MODE PLASMA CONFINEMENT; ELECTRIC FIELDS; SHEAR PROPERTIES; STABILITY; FLUCTUATIONS

Citation Formats

Carlstrom, T N. Transition physics and scaling overview. United States: N. p., 1995. Web.
Carlstrom, T N. Transition physics and scaling overview. United States.
Carlstrom, T N. Fri . "Transition physics and scaling overview". United States. https://www.osti.gov/servlets/purl/192512.
@article{osti_192512,
title = {Transition physics and scaling overview},
author = {Carlstrom, T N},
abstractNote = {This paper presents an overview of recent experimental progress towards understanding H-mode transition physics and scaling. Terminology and techniques for studying H-mode are reviewed and discussed. The model of shear E x B flow stabilization of edge fluctuations at the L-H transition is gaining wide acceptance and is further supported by observations of edge rotation on a number of new devices. Observations of poloidal asymmetries of edge fluctuations and dephasing of density and potential fluctuations after the transition pose interesting challenges for understanding H-mode physics. Dedicated scans to determine the scaling of the power threshold have now been performed on many machines. A dear B{sub t} dependence is universally observed but dependence on the line averaged density is complicated. Other dependencies are also reported. Studies of the effect of neutrals and error fields on the power threshold are under investigation. The ITER threshold database has matured and offers guidance to the power threshold scaling issues relevant to next-step devices.},
doi = {},
url = {https://www.osti.gov/biblio/192512}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {12}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: