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Abstract
An improved set of guidingcentre equations, expanded to one order higher in Larmor radius than usually written for guidingcentre codes, are derived for curvilinear flux coordinates and implemented into the orbit following code VENUSLEVIS. Aside from greatly improving the correspondence between guidingcentre and full particle trajectories, the most important effect of the additional Larmor radius corrections is to modify the definition of the guidingcentre's parallel velocity via the socalled Baños drift. The correct treatment of the guidingcentre pushforward with the Baños term leads to an anisotropic shift in the phasespace distribution of guidingcentres, consistent with the wellknown magnetization term. The consequence of these higher order terms are quantified in three cases where energetic ions are usually followed with standard guidingcentre equations: (1) neutral beam injection in a MASTlike low aspectratio spherical equilibrium where the fast ion driven current is significantly larger with respect to previous calculations, (2) fast ion losses due to resonant magnetic perturbations where a lower lost fraction and a better confinement is confirmed, (3) alpha particles in the ripple field of the European DEMO where the effect is found to be marginal.
Original language  English 

Article number  044014 
Journal  Plasma Physics and Controlled Fusion 
Volume  59 
Issue number  4 
DOIs  
Publication status  Published  15 Mar 2017 
Externally published  Yes 
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Dive into the research topics of 'Higher order Larmor radius corrections to guidingcentre equations and application to fast ion equilibrium distributions'. Together they form a unique fingerprint.Activities
 1 Participation in workshop, seminar or course

Minicourse/workshop on the application of computational mathematics to plasma physics
David Pfefferle (Keynote speaker/Invited speaker)
24 Jun 2019 → 27 Jun 2019Activity: Conferences and workshops › Participation in workshop, seminar or course