Session GO4: DIII-D Tokamak
9:30 AM–12:30 PM, Tuesday, November 15, 2011
Room: Ballroom E
Chair: David Pace, ORISE
Abstract ID: BAPS.2011.DPP.GO4.3
Abstract: GO4.00003 : Off-Axis NBCD Experiments in DIII-D
9:54 AM–10:06 AM
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Abstract 
Authors:
J.M. Park
M. Murakami
(ORNL)
C.C. Petty
M.A. Van Zeeland
J.R. Ferron
T.H. Osborne
P.A. Politzer
R. Prater
(GA)
W.W. Heidbrink
(UCI)
C.T. Holcomb
(LLNL)
D.C. Pace
(ORISE)
Experiments on off-axis neutral beam current drive (NBCD) in DIII-D have clearly demonstrated off-axis NBCD using the new tilted beamline. The local NBCD and beam ion density profiles were measured in H-mode plasmas under a range of beam injection and discharge conditions, including on/off-axis, parallel/perpendicular injections, beam energy, injection power, toroidal field direction, plasma beta, and ratio of beam energy to electron temperature. For the off-axis injection, the magnetic pitch angles measured by the motional Stark effect diagnostic show clear evidence of off-axis NBCD when compared with the on-axis injection at the same electron temperature and density. The beam-stored energy estimated by equilibrium reconstruction, neutron, and fast-ion D$_\alpha$ data indicate no large anomalous losses of NBCD and fast ions. The measurements are compared with the classical model calculation using NUBEAM for validation of the off-axis NBCD physics.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.DPP.GO4.3