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Title: Ray-tracing model of IBW generated sheared flow for plasma transport control

Abstract

A sheared flow generation model based on ion Bernstein wave (IBW) ray-tracing code is developed to improve the sheared flow prediction capability over the previous more analytical calculations. The model provides the momentum drive profile for each ion species for each ray. The calculated driven flow momentum is summed over all ions and all rays in each flux surface. A strong sheared flow is generated near the wave power absorption region since {ital d}/{ital dr}{approx_equal}{minus}2 Im {ital k}{sub {ital r}}. The combination of high wave electric fields, large ion response functions, high wave number (which is enhanced near the absorption region), and strong local wave absorption all contribute to make the poloidal sheared flow significant. The model calculation appears to agree well with the induced transport barrier observed during the CH-mode in PBX-M. The model predicts high efficiency for poloidal sheared flow generation in reactor-grade plasmas (e.g. for ITER parameters, P{sub IBW}{approx_equal}10 MW{lt}P{sub {alpha}}.) A simple device/plasma scaling based on the IBW wave behavior near the ion cyclotron absorption layer is also obtained. This technique provides a promising tool for active plasma pressure and bootstrap current profile control, which is essential for advance tokamaks such as TPX and DEMO. Themore » peaking of density and pressure profiles could also benefit TFTR and ITER by enhancing fusion reactivity. {copyright} {ital 1996 American Institute of Physics.}« less

Authors:
 [1]
  1. Princeton University, Plasma Physics Laboratory, Princeton, New Jersey 08543, (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
285240
Report Number(s):
CONF-9505105-
Journal ID: APCPCS; ISSN 0094-243X; TRN: 96:020019
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 355; Journal Issue: 1; Conference: 11. topical conference on radio frequency in plasmas, Palm Springs, CA (United States), 17-19 May 1995; Other Information: PBD: Feb 1996
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; TOKAMAK DEVICES; FLOW MODELS; SHEAR; BERNSTEIN MODE; PLASMA CONFINEMENT; SCALING LAWS; CURRENT DENSITY; RAY TRACING

Citation Formats

Ono, M. Ray-tracing model of IBW generated sheared flow for plasma transport control. United States: N. p., 1996. Web. doi:10.1063/1.49588.
Ono, M. Ray-tracing model of IBW generated sheared flow for plasma transport control. United States. https://doi.org/10.1063/1.49588
Ono, M. 1996. "Ray-tracing model of IBW generated sheared flow for plasma transport control". United States. https://doi.org/10.1063/1.49588.
@article{osti_285240,
title = {Ray-tracing model of IBW generated sheared flow for plasma transport control},
author = {Ono, M},
abstractNote = {A sheared flow generation model based on ion Bernstein wave (IBW) ray-tracing code is developed to improve the sheared flow prediction capability over the previous more analytical calculations. The model provides the momentum drive profile for each ion species for each ray. The calculated driven flow momentum is summed over all ions and all rays in each flux surface. A strong sheared flow is generated near the wave power absorption region since {ital d}/{ital dr}{approx_equal}{minus}2 Im {ital k}{sub {ital r}}. The combination of high wave electric fields, large ion response functions, high wave number (which is enhanced near the absorption region), and strong local wave absorption all contribute to make the poloidal sheared flow significant. The model calculation appears to agree well with the induced transport barrier observed during the CH-mode in PBX-M. The model predicts high efficiency for poloidal sheared flow generation in reactor-grade plasmas (e.g. for ITER parameters, P{sub IBW}{approx_equal}10 MW{lt}P{sub {alpha}}.) A simple device/plasma scaling based on the IBW wave behavior near the ion cyclotron absorption layer is also obtained. This technique provides a promising tool for active plasma pressure and bootstrap current profile control, which is essential for advance tokamaks such as TPX and DEMO. The peaking of density and pressure profiles could also benefit TFTR and ITER by enhancing fusion reactivity. {copyright} {ital 1996 American Institute of Physics.}},
doi = {10.1063/1.49588},
url = {https://www.osti.gov/biblio/285240}, journal = {AIP Conference Proceedings},
number = 1,
volume = 355,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 1996},
month = {Thu Feb 01 00:00:00 EST 1996}
}