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Title: Spreading of wave-driven currents in a tokamak

Abstract

Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an actual discharge aimed at raising the central q above unity. Such configurations offer advantages for steady-state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid-driven current and power using a diffusion-Eke equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if D{sub fast} {approx} 1.0 m{sup 2}/s. Such a value for D{sub fast} is in the range suggested by other work.

Authors:
; ; ;
Publication Date:
Research Org.:
Princeton Univ., NJ (United States). Plasma Physics Lab.
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
206597
Report Number(s):
PPPL-3158
ON: DE96007506; TRN: 96:009430
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jan 1996
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; PBX DEVICES; LOWER HYBRID CURRENT DRIVE; PLASMA SIMULATION; MODIFICATIONS; THEORETICAL DATA; ENERGY ABSORPTION; COMPARATIVE EVALUATIONS

Citation Formats

Ignat, D.W., Kaita, R., Jardin, S.C., and Okabayashi, M. Spreading of wave-driven currents in a tokamak. United States: N. p., 1996. Web. doi:10.2172/206597.
Ignat, D.W., Kaita, R., Jardin, S.C., & Okabayashi, M. Spreading of wave-driven currents in a tokamak. United States. doi:10.2172/206597.
Ignat, D.W., Kaita, R., Jardin, S.C., and Okabayashi, M. Mon . "Spreading of wave-driven currents in a tokamak". United States. doi:10.2172/206597. https://www.osti.gov/servlets/purl/206597.
@article{osti_206597,
title = {Spreading of wave-driven currents in a tokamak},
author = {Ignat, D.W. and Kaita, R. and Jardin, S.C. and Okabayashi, M.},
abstractNote = {Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an actual discharge aimed at raising the central q above unity. Such configurations offer advantages for steady-state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid-driven current and power using a diffusion-Eke equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if D{sub fast} {approx} 1.0 m{sup 2}/s. Such a value for D{sub fast} is in the range suggested by other work.},
doi = {10.2172/206597},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1996},
month = {Mon Jan 01 00:00:00 EST 1996}
}

Technical Report:

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