skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Off-axis neutral beam current drive for advanced scenario development in DIII-D

Abstract

Modification of the two existing DIII-D neutral beamlines is planned to allow vertical steering to provide off-axis neutral beam current drive (NBCD) peaked as far off-axis as half the plasma minor radius. New calculations for a downward-steered beam indicate strong current drive with good localization off-axis so long as the toroidal magnetic field, B-T, and the plasma current, I-p, point in the same direction. This is due to good alignment of neutral beam injection (NBI) with the local pitch of the magnetic field lines. This model has been tested experimentally on DIII-D by injecting equatorially mounted NBs into reduced size plasmas that are vertically displaced with respect to the vessel midplane. The existence of off-axis NBCD is evident in the changes seen in sawtooth behaviour in the internal inductance. By shifting the plasma upwards or downwards, or by changing the sign of the toroidal field, off-axis NBCD profiles measured with motional Stark effect data and internal loop voltage show a difference in amplitude (40-45%) consistent with differences predicted by the changed NBI alignment with respect to the helicity of the magnetic field lines. The effects of NBI direction relative to field line helicity can be large even in ITER: off-axismore » NBCD can be increased by more than 30% if the B-T direction is reversed. Modification of the DIII-D NB system will strongly support scenario development for ITER and future tokamaks as well as provide flexible scientific tools for understanding transport, energetic particles and heating and current drive.« less

Authors:
 [1];  [1];  [2];  [2];  [3];  [2];  [4];  [2];  [5]
  1. ORNL
  2. General Atomics, San Diego
  3. University of California, Irvine
  4. General Atomics
  5. Oak Ridge Institute for Science and Education (ORISE)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1015756
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Fusion; Journal Volume: 49; Journal Issue: 6
Country of Publication:
United States
Language:
English

Citation Formats

Murakami, Masanori, Park, Jin Myung, Petty, C C., Luce, T.C., Heidbrink, W. W., Osborne, T.H., Prater, R., Wade, M R, and Unterberg, E. A. Off-axis neutral beam current drive for advanced scenario development in DIII-D. United States: N. p., 2009. Web. doi:10.1088/0029-5515/49/6/065031.
Murakami, Masanori, Park, Jin Myung, Petty, C C., Luce, T.C., Heidbrink, W. W., Osborne, T.H., Prater, R., Wade, M R, & Unterberg, E. A. Off-axis neutral beam current drive for advanced scenario development in DIII-D. United States. doi:10.1088/0029-5515/49/6/065031.
Murakami, Masanori, Park, Jin Myung, Petty, C C., Luce, T.C., Heidbrink, W. W., Osborne, T.H., Prater, R., Wade, M R, and Unterberg, E. A. Thu . "Off-axis neutral beam current drive for advanced scenario development in DIII-D". United States. doi:10.1088/0029-5515/49/6/065031.
@article{osti_1015756,
title = {Off-axis neutral beam current drive for advanced scenario development in DIII-D},
author = {Murakami, Masanori and Park, Jin Myung and Petty, C C. and Luce, T.C. and Heidbrink, W. W. and Osborne, T.H. and Prater, R. and Wade, M R and Unterberg, E. A.},
abstractNote = {Modification of the two existing DIII-D neutral beamlines is planned to allow vertical steering to provide off-axis neutral beam current drive (NBCD) peaked as far off-axis as half the plasma minor radius. New calculations for a downward-steered beam indicate strong current drive with good localization off-axis so long as the toroidal magnetic field, B-T, and the plasma current, I-p, point in the same direction. This is due to good alignment of neutral beam injection (NBI) with the local pitch of the magnetic field lines. This model has been tested experimentally on DIII-D by injecting equatorially mounted NBs into reduced size plasmas that are vertically displaced with respect to the vessel midplane. The existence of off-axis NBCD is evident in the changes seen in sawtooth behaviour in the internal inductance. By shifting the plasma upwards or downwards, or by changing the sign of the toroidal field, off-axis NBCD profiles measured with motional Stark effect data and internal loop voltage show a difference in amplitude (40-45%) consistent with differences predicted by the changed NBI alignment with respect to the helicity of the magnetic field lines. The effects of NBI direction relative to field line helicity can be large even in ITER: off-axis NBCD can be increased by more than 30% if the B-T direction is reversed. Modification of the DIII-D NB system will strongly support scenario development for ITER and future tokamaks as well as provide flexible scientific tools for understanding transport, energetic particles and heating and current drive.},
doi = {10.1088/0029-5515/49/6/065031},
journal = {Nuclear Fusion},
number = 6,
volume = 49,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2009},
month = {Thu Jan 01 00:00:00 EST 2009}
}