Ray-tracing model of IBW generated sheared flow for plasma transport control
- Princeton University, Plasma Physics Laboratory, Princeton, New Jersey 08543, (United States)
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.}
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 285240
- Report Number(s):
- CONF-9505105-; ISSN 0094-243X; TRN: 96:020019
- Journal Information:
- AIP Conference Proceedings, Vol. 355, 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
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