M. Schneider et al 2009 Nucl. Fusion 49 125005 doi:10.1088/0029-5515/49/12/125005
M. Schneider1, L.-G. Eriksson2, F. Imbeaux1 and J-F. Artaud1
Show affiliationsIn order to control the plasma current profile, it might be necessary to apply lower hybrid waves in ITER and future fusion reactors, since they are capable of generating off-axis current. However, the efficiency of the lower hybrid current drive may be affected by parasitic absorption by fusion-born alpha particles. In order to quantify this absorption, a consistent coupling has been established between (i) the DELPHINE code which calculates the LH wave propagation and absorption on electrons and alpha particles and (ii) the SPOT orbit following Monte Carlo code augmented with an operator accounting for the interaction between fast ions and radio-frequency waves. The LH wave absorption in the ITER steady-state reference scenario 4 (ITER Technical Basis 2002 ITER EDA Documentation Series No 24, Report G A0 FDR 1 01-07-13 R1.0) has been analysed for the LH source frequencies of 5 and 3.7 GHz. Results indicate that the alpha parasitic absorption is weak for both cases: 0.08% and less than 3% for 5 GHz and 3.7 GHz, respectively.
52.55.Fa Tokamaks, spherical tokamaks
28.52.Av Theory, design, and computerized simulation
52.55.Wq Current drive; helicity injection
52.55.Pi Fusion products effects (e.g., alpha-particles, etc.), fast particle effects
Issue 12 (December 2009)
Received 20 March 2009, accepted for publication 8 October 2009
Published 26 October 2009
M. Schneider et al 2009 Nucl. Fusion 49 125005
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