Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.3424
Publisher DOI: 10.1016/j.cpc.2021.107876
arXiv ID: 2005.07705v2
Title: Performance of the BGSDC integrator for computing fast ion trajectories in nuclear fusion reactors
Language: English
Authors: Tretiak, Krasymyr 
Buchanan, James 
Akers, Rob 
Ruprecht, Daniel  
Keywords: Boris integrator; DIII-D; Fast ions; JET; Neutral beam injection; Particle tracking; Spectral deferred corrections; Physics - Computational Physics; Physics - Computational Physics; Computer Science - Numerical Analysis; Mathematics - Numerical Analysis
Issue Date: Jul-2021
Publisher: North Holland Publ. Co./Elsevier
Source: Computer Physics Communications 264: 107876 (2021-07)
Abstract (english): 
Modelling neutral beam injection (NBI) in fusion reactors requires computing the trajectories of large ensembles of particles. Slowing down times of up to one second combined with nanosecond time steps make these simulations computationally very costly. This paper explores the performance of BGSDC, a new numerical time stepping method, for tracking ions generated by NBI in the DIII-D and JET reactors. BGSDC is a high-order generalisation of the Boris method, combining it with spectral deferred corrections and the Generalized Minimal Residual method GMRES. Without collision modelling, where numerical drift can be quantified accurately, we find that BGSDC can deliver higher quality particle distributions than the standard Boris integrator at comparable cost or comparable distributions at lower cost. With collision models, quantifying accuracy is difficult but we show that BGSDC produces stable distributions at larger time steps than Boris.
URI: http://hdl.handle.net/11420/9256
DOI: 10.15480/882.3424
ISSN: 0010-4655
Journal: Computer Physics Communications 
Institute: Mathematik E-10 
Document Type: Article
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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