NDLI: TH / P 3-1 Off-axis Neutral Beam Current Drive for Advanced Scenario Development in DIII -

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TH / P 3-1 Off-axis Neutral Beam Current Drive for Advanced Scenario Development in DIII -

Content Provider	Semantic Scholar
Author	Murakami, Masami Park, Jin Myung Petty, C. C. Luce, Tim C. Heidbrink, William Walter Osborne, Thomas H. Wade, Michael R. Austin, Max E. Brooks, Neil H. Budny, Robert Vierling Challis, Collin Deboo, James Craig Degrassie, John S. Ferron, John R. Gohil, Punit Hobirk, J. Holcomb, Christopher T. Hollmann, Eric Matthias Hyatt, A. W. Lohr, John Lanctot, Matthew J. Makowski, Michael A. McCune, Douglas Politzer, Peter Prater, Ronald H. E. St. John Suzuki, Toshihiro West, W. P. Unterberg, Ezekial A. Zeeland, Michael Anthony Van Yu, Jong Hun
Copyright Year	2008
Abstract	Modification of the two existing DIII-D neutral beam lines is proposed to allow vertical steering to provide off-axis neutral beam current drive (NBCD) as far off-axis as half the plasma radius. New calculations indicate very good current drive with good localization off-axis as long as the toroidal magnetic field, BT, and the plasma current, Ip, are in the same direction (for a beam steered downward). The effects of helicity can be large: e.g., ITER off-axis NBCD can be increased by more than 20% if the BT direction is reversed. This prediction has been tested by an off-axis NBCD experiment using reduced size plasmas that are vertically shifted with the existing NBI on DIII-D. The existence of off-axis NBCD is evident in sawtooth and internal inductance behavior. By shifting the plasma upward or downward, or by changing the sign of the toroidal field, measured off-axis NBCD profiles, determined from MSE data, are consistent with predicted differences (40%– 45%) arising from the NBI orientation with respect to the magnetic field lines. Modification of the DIII-D NB system will strongly support scenario development for ITER and future tokamaks as well as providing flexible scientific tools for understanding transport, energetic particles and heating and current drive.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www-pub.iaea.org/MTCD/Meetings/FEC2008/th_p3-1.pdf
Alternate Webpage(s)	https://www-pub.iaea.org/MTCD/Meetings/FEC2008/th_p3-1.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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