Comparison of L-H transition measurements with physics models
Abstract
A technique of fitting a modified hyperbolic tangent to the edge profiles has improved the localization of plasma edge parameters. Non-dimensional edge parameters are broadly consistent with several theories of the L-H transition that use edge gradients in their formulation of a critical threshold parameter. The ion {del}B drift direction has only a small effect on the edge plasma conditions measured near the plasma midplane but a large effect on the divertor plasma. The dramatic change of power threshold with the direction of the ion {del}B drift implies that phenomena in the divertor region may be critical for the L-H transition.
- Authors:
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Research, Washington, DC (United States)
- OSTI Identifier:
- 296838
- Report Number(s):
- GA-A22989; CONF-981064-
ON: DE99001353; TRN: 99:002479
- DOE Contract Number:
- AC03-89ER51114
- Resource Type:
- Conference
- Resource Relation:
- Conference: 17. IAEA fusion energy conference, Yokohama (Japan), 19-24 Oct 1998; Other Information: PBD: Dec 1998
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION; H-MODE PLASMA CONFINEMENT; ION DRIFT; DIVERTORS; MAGNETIC SURFACES; DOUBLET-3 DEVICE; ELECTRON DENSITY; ELECTRON TEMPERATURE; ION TEMPERATURE
Citation Formats
Carlstrom, T N, Burrell, K H, Groebner, R J, Leonard, A W, Osborne, T H, and Thomas, D M. Comparison of L-H transition measurements with physics models. United States: N. p., 1998.
Web.
Carlstrom, T N, Burrell, K H, Groebner, R J, Leonard, A W, Osborne, T H, & Thomas, D M. Comparison of L-H transition measurements with physics models. United States.
Carlstrom, T N, Burrell, K H, Groebner, R J, Leonard, A W, Osborne, T H, and Thomas, D M. 1998.
"Comparison of L-H transition measurements with physics models". United States. https://www.osti.gov/servlets/purl/296838.
@article{osti_296838,
title = {Comparison of L-H transition measurements with physics models},
author = {Carlstrom, T N and Burrell, K H and Groebner, R J and Leonard, A W and Osborne, T H and Thomas, D M},
abstractNote = {A technique of fitting a modified hyperbolic tangent to the edge profiles has improved the localization of plasma edge parameters. Non-dimensional edge parameters are broadly consistent with several theories of the L-H transition that use edge gradients in their formulation of a critical threshold parameter. The ion {del}B drift direction has only a small effect on the edge plasma conditions measured near the plasma midplane but a large effect on the divertor plasma. The dramatic change of power threshold with the direction of the ion {del}B drift implies that phenomena in the divertor region may be critical for the L-H transition.},
doi = {},
url = {https://www.osti.gov/biblio/296838},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 01 00:00:00 EST 1998},
month = {Tue Dec 01 00:00:00 EST 1998}
}
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