Verification and validation of the high-performance Lorentz-orbit code for use in stellarators and tokamaks (LOCUST)
Loading...
Access rights
openAccess
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2021-08
Department
Major/Subject
Mcode
Degree programme
Language
en
Pages
14
Series
Nuclear Fusion, Volume 61, issue 8
Abstract
A novel high-performance computing algorithm, developed in response to the next generation of computational challenges associated with burning plasma regimes in ITER-scale tokamak devices, has been tested and is described herein. The Lorentz-orbit code for use in stellarators and tokamaks (LOCUST) is designed for computationally scalable modelling of fast-ion dynamics, in the presence of detailed first wall geometries and fine 3D magnetic field structures. It achieves this through multiple levels of single instruction, multiple thread parallelism and by leveraging general-purpose graphics processing units. This enables LOCUST to rapidly track the full-orbit trajectories of kinetic Monte Carlo markers to deliver high-resolution fast-ion distribution functions and plasma-facing component power loads. LOCUST has been tested against the prominent NUBEAM and ASCOT fast-ion codes. All codes were compared for collisional plasmas in both high and low-aspect ratio toroidal geometries, with full-orbit and guiding-centre tracking. LOCUST produces statistically consistent results in line with acceptable theoretical and Monte Carlo uncertainties. Synthetic fast-ion D-α diagnostics produced by LOCUST are also compared to experiment using FIDASIM and show good agreement.Description
| openaire: EC/H2020/633053/EU//EUROfusion
Keywords
energetic particles, fusion, high performance computing, LOCUST, tokamak, validation, verification
Other note
Citation
Ward, S H, Akers, R, Jacobsen, A S, Ollus, P, Pinches, S D, Tholerus, E, Vann, R G L & Van Zeeland, M A 2021, ' Verification and validation of the high-performance Lorentz-orbit code for use in stellarators and tokamaks (LOCUST) ', Nuclear Fusion, vol. 61, no. 8, 086029 . https://doi.org/10.1088/1741-4326/ac108c