Title :
Scoping studies for NBI launch geometry on DEMO
Author :
Jenkins, I. ; Challis, C.D. ; Keeling, D.L. ; Surrey, E.
Author_Institution :
CCFE, Culham Sci. Centre, Abingdon, UK
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.
Keywords :
Tokamak devices; fusion reactor design; plasma beam injection heating; plasma density; plasma temperature; plasma toroidal confinement; DEMO design; NBI launch geometry; beam energies; beamline geometry; genetic algorithm; injection tangency; neutral beam current drive; neutral beam injection; plasma density; plasma temperature; pulse duration; target NBCD profile; Genetic algorithms; Geometry; Particle beams; Plasma temperature; Temperature distribution; Trajectory; DEMO; beamline; current drive; genetic algorithm; neutral beam;
Conference_Titel :
Fusion Engineering (SOFE), 2013 IEEE 25th Symposium on
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4799-0169-2
DOI :
10.1109/SOFE.2013.6635445
