TY - GEN
T1 - Monte-Carlo simulation of high harmonic fast wave heating of neutral beam ions and effects on MHD stability
T2 - THEORY OF FUSION PLASMAS: Joint Varenna-Lausanne International Workshop
AU - Chan, V. S.
AU - Turnbull, A. D.
AU - Choi, M.
AU - Chu, M. S.
AU - Lao, L. L.
PY - 2006
Y1 - 2006
N2 - Experimentally, during fast wave (FW) radio frequency (rf) heating in DIII-D L-mode discharges, strong acceleration of neutral beam (NB) deuterium beam ions has been observed. Significant effects on the n/m = 1/1 sawtooth stability are also seen. Simulations using the Monte-Carlo Hamiltonian code ORBIT-RF, coupled to the TORIC full wave code, predict beam ion tails up to a few hundred keV, in agreement with the experiment. The simulations and experiment both clearly show a much greater efficiency for 4th harmonic FW heating than for 8th harmonic heating. Simple analyses of the kinetic contribution to the ideal magnetohydrodynamic (MHD) potential energy from energetic beam ions generated by FW heating yields reasonable consistency with the observations. A more detailed analysis shows a more complicated picture, however. Other physics effects such as geometry, plasma rotation, and the presence of a free boundary, play a significant role.
AB - Experimentally, during fast wave (FW) radio frequency (rf) heating in DIII-D L-mode discharges, strong acceleration of neutral beam (NB) deuterium beam ions has been observed. Significant effects on the n/m = 1/1 sawtooth stability are also seen. Simulations using the Monte-Carlo Hamiltonian code ORBIT-RF, coupled to the TORIC full wave code, predict beam ion tails up to a few hundred keV, in agreement with the experiment. The simulations and experiment both clearly show a much greater efficiency for 4th harmonic FW heating than for 8th harmonic heating. Simple analyses of the kinetic contribution to the ideal magnetohydrodynamic (MHD) potential energy from energetic beam ions generated by FW heating yields reasonable consistency with the observations. A more detailed analysis shows a more complicated picture, however. Other physics effects such as geometry, plasma rotation, and the presence of a free boundary, play a significant role.
UR - http://www.scopus.com/inward/record.url?scp=33846984617&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33846984617&partnerID=8YFLogxK
U2 - 10.1063/1.2404537
DO - 10.1063/1.2404537
M3 - Conference contribution
AN - SCOPUS:33846984617
SN - 0735403767
SN - 9780735403765
T3 - AIP Conference Proceedings
SP - 27
EP - 38
BT - THEORY OF FUSION PLASMAS
Y2 - 28 August 2006 through 1 September 2006
ER -