Monte-Carlo simulation of high harmonic fast wave heating of neutral beam ions and effects on MHD stability: Validation with experiments

V. S. Chan, A. D. Turnbull, M. Choi, M. S. Chu, L. L. Lao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationTHEORY OF FUSION PLASMAS
Subtitle of host publicationJoint Varenna-Lausanne International Workshop
Pages27-38
Number of pages12
DOIs
Publication statusPublished - 2006 Dec 1
EventTHEORY OF FUSION PLASMAS: Joint Varenna-Lausanne International Workshop - Varenna, Italy
Duration: 2006 Aug 282006 Sep 1

Publication series

NameAIP Conference Proceedings
Volume871
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceTHEORY OF FUSION PLASMAS: Joint Varenna-Lausanne International Workshop
CountryItaly
CityVarenna
Period06-08-2806-09-01

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Chan, V. S., Turnbull, A. D., Choi, M., Chu, M. S., & Lao, L. L. (2006). Monte-Carlo simulation of high harmonic fast wave heating of neutral beam ions and effects on MHD stability: Validation with experiments. In THEORY OF FUSION PLASMAS: Joint Varenna-Lausanne International Workshop (pp. 27-38). (AIP Conference Proceedings; Vol. 871). https://doi.org/10.1063/1.2404537