Abstract

To simulate the resonant interaction of fast Alfven wave (FW) heating and Coulomb collisions on energetic ions, including finite orbit effects, a Monte‐Carlo code ORBIT‐RF has been coupled with a 2D full wave code TORIC4. ORBIT‐RF solves Hamiltonian guiding center drift equations to follow trajectories of test ions in 2D axisymmetric numerical magnetic equilibrium under Coulomb collisions and ion cyclotron radio frequency quasi‐linear heating. Monte‐Carlo operators for pitch‐angle scattering and drag calculate the changes of test ions in velocity and pitch angle due to Coulomb collisions. A rf‐induced random walk model describing fast ion stochastic interaction with FW reproduces quasi‐linear diffusion in velocity space. FW fields and its wave numbers from TORIC are passed on to ORBIT‐RF to calculate perpendicular rf kicks of resonant ions valid for arbitrary cyclotron harmonics. ORBIT‐RF coupled with TORIC using a single dominant toroidal and poloidal wave number has demonstrated consistency of simulations with recent DIII‐D FW experimental results for interaction between injected neutral‐beam ions and FW, including measured neutron enhancement and enhanced high energy tail. Comparison with C‐Mod fundamental heating discharges also yielded reasonable agreement.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.