Abstract
A range of possible Neutral Beam Injection (NBI) geometries for DEMO have been scanned in order to determine the efficiency of Neutral Beam Current Drive (NBCD) in two proposed density and temperature scenarios. Beam energies of 1.5MeV and 1MeV are compared to show that the beam shinethrough onto the vessel wall at the higher beam energy would, for certain scenarios, restrict the options for injection tangency and hence, off-axis current drive. This could be important for using NBCD to extend pulse duration in DEMO. Finally, a method using a genetic algorithm to help optimize source placement to generate a given target NBCD profile is described which can help in determining beamline geometry.
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