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Author: Vinicius N Duarte
Requested Type: Poster
Submitted: 2018-02-27 17:00:33

Co-authors: N. N. Gorelenkov

Contact Info:
Princeton Plasma Physics Laboratory
100 Stellarator Rd
Princeton, NJ   08543

Abstract Text:
The interaction between fast ions and Alfvénic eigenmodes has proved numerically expensive to be modeled in realistic tokamak configurations. It can, therefore, be convenient to exploit reduced modeling for experimental situations in which highly nonlinear effects such as wave chirping or three-wave coupling are not present. The Resonance Broadening Quasilinear (RBQ) code, which is capable of modeling the fast ion distribution function while self-consistently evolving the amplitude of modes, is presently under development. RBQ is interfaced with linear ideal MHD and stability codes, which provide eigenstructures, damping rates and resonant surfaces. We report efforts on the development and verification of the diffusion solver used in the RBQ code by comparing numerical outputs with known analytical solutions for limiting cases. Both the resonant and the collisional components of the code are thoroughly verified. Conservation laws are also verified in the modal problem. In addition, we report on the progress of coupling the RBQ code with the TRANSP code and on the implementation of the distribution function using three injected energies within the RBQ modeling. The losses of energetic particles are quantified in terms of boundary conditions, the number of grid points and the stepping in time of the finite difference scheme.

Please place this poster close to Nikolai Gorelenkov's poster, in case he will be giving a poster presentation.