HALO: A full-orbit model of nonlinear interaction of fast particles with eigenmodes

Fitzgerald, Michael; Buchanan, J.; Akers, R. J.; Breizman, B. N.; Sharapov, S. E.

doi:10.1016/j.cpc.2019.04.006

HALO: A full-orbit model of nonlinear interaction of fast particles with eigenmodes

Journal Article · Sun Apr 28 00:00:00 EDT 2019 · Computer Physics Communications

DOI:https://doi.org/10.1016/j.cpc.2019.04.006· OSTI ID:1785224

Fitzgerald, Michael ^[1]; Buchanan, J. ^[2]; Akers, R. J. ^[2]; Breizman, B. N. ^[3]; Sharapov, S. E. ^[2]

CCFE, Culham Science Centre, Oxon (United Kingdom); Institute for Fusion Studies
CCFE, Culham Science Centre, Oxon (United Kingdom)
Univ. of Texas, Austin, TX (United States)

HALO (HAgis LOcust) solves the initial value Vlasov-Maxwell problem perturbatively for application to certain nonlinear wave-particle problems in tokamak plasmas. It uses the same basic approach as the HAGIS code for wave evolution but is built on the LOCUST-GPU full-orbit code for the solution of the Hamiltonian fast particle motion in cylindrical coordinates. The wave amplitude and particle evolution include all finite Larmour radius effects. We describe and benchmark the currently implemented Alfvén eigenmode workflow, demonstrating correct particle motion, linear and nonlinear power transfer. Here, the formulation and numerical scheme are sufficiently general as to allow easy future implementation of different kinds of eigenmodes, such as modes close to the ion-cyclotron frequency. The code can model multiple eigenmodes and multiple fast ion species simultaneously, and supports the general form of the equilibrium distribution in constants of motion.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-04ER54742

OSTI ID:: 1785224

Journal Information:: Computer Physics Communications, Journal Name: Computer Physics Communications Vol. 252; ISSN 0010-4655

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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HALO: A full-orbit model of nonlinear interaction of fast particles with eigenmodes

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