Monte Carlo orbit/full wave simulation of ion cyclotron resonance frequency wave damping on resonant ions in tokamaks

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  • M. Choi
    General Atomics , P.O. Box 85608, San Diego, California 92186-5608
  • V. S. Chan
    General Atomics , P.O. Box 85608, San Diego, California 92186-5608
  • R. I. Pinsker
    General Atomics , P.O. Box 85608, San Diego, California 92186-5608
  • S. C. Chiu
    Sunrise R&M Inc. , San Diego, California 92129
  • W. W. Heidbrink
    University of California , Irvine, California 92697

Bibliographic Information

Published
2005-06-20
DOI
  • 10.1063/1.1935387
Publisher
AIP Publishing

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<jats:p>To investigate the experimentally observed interaction between beam ion species and fast Alfvén wave (FW), a Monte Carlo code, ORBIT-RF [V. S. Chan, S. C. Chiu, and Y. A. Omelchenko, Phys. Plasmas 9, 501 (2002)], which solves the time-dependent Hamiltonian guiding center drift equations, has been upgraded to incorporate a steady-state neutral beam ion slowing-down distribution, a quasilinear high harmonic radio frequency diffusion operator and the wave fields from the two-dimensional ion cyclotron resonance frequency full wave code (TORIC4) [M. Brambilla, Plasma Phys. Controlled Fusion 41, 1 (1999)]. Comparison of ORBIT-RF simulation of power absorption with fixed amplitudes of FW fields from TORIC4 power absorption calculation, which assumes Maxwellian plasma distributions, attains agreement within a factor of two. The experimentally measured enhanced neutron rate is reproduced to within 30% from ORBIT-RF simulation using a single dominant toroidal and poloidal wave number.</jats:p>

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