Modelling of advanced tokamak scenarios with LHCD in Alcator C-Mod

Content Provider	Scilit
Author	Bonoli, P. T. Parker, R. R. Porkolab, M. Ramos, J. J. Wukitch, S. J. Takase, Y. Bernabei, S. Hosea, J. C. Schilling, G. Wilson, J. R.
Copyright Year	2000
Description	Journal: Nuclear Fusion A combined model for current profile control and MHD stability analysis has been used to identify stable operating modes near the ideal stability limit $(β_{N}$ 3) in the Alcator C-Mod tokamak. These discharges are characterized by relatively high fractions of bootstrap current $(f_{BS}$ = 0.70) and non-monotonic profiles of the safety factor with $q_{min}$ > 2. In the absence of a conducting shell, stability was determined by the onset of the low (n = 1) external kink mode. In these studies, current profile control in the plasma periphery (r/a 0.5) was provided by 2.5-3.0 MW of LHCD power. Internal and edge transport barriers were introduced into the model calculations in the form of density transitions. Excellent wave accessibility and absorption were still found in the presence of an H-mode-like edge density barrier. However, the presence of these barriers resulted in about a 10% decrease in the stability limit, from $β_{N}$ 3 to $β_{N}$ 2.7.
Related Links	http://iopscience.iop.org/article/10.1088/0029-5515/40/6/319/pdf
Ending Page	1256
Page Count	6
Starting Page	1251
ISSN	00295515
e-ISSN	17414326
DOI	10.1088/0029-5515/40/6/319
Journal	Nuclear Fusion
Issue Number	6
Volume Number	40
Language	English
Publisher	IOP Publishing
Publisher Date	2000-06-01
Access Restriction	Open
Subject Keyword	Journal: Nuclear Fusion Nuclear Energy and Engineering
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics