English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Relativistic magnetic reconnection is a non-ideal plasma process that is asource of non-thermal particle acceleration in many high-energy astrophysicalsystems. Particle-in-cell (PIC) methods are commonly used for simulatingreconnection from first principles. While much progress has been made inunderstanding the physics of reconnection, especially in 2D, the adoption ofadvanced algorithms and numerical techniques for efficiently modeling suchsystems has been limited. With the GPU-accelerated PIC code WarpX, we explorethe accuracy and potential performance benefits of two advanced Maxwell solveralgorithms: a non-standard finite difference scheme (CKC) and anultrahigh-order pseudo-spectral method (PSATD). We find that for therelativistic reconnection problem, CKC and PSATD qualitatively andquantitatively match the standard Yee-grid finite-difference method. CKC andPSATD both admit a time step that is 40% longer than Yee, resulting in a ~40%faster time to solution for CKC, but no performance benefit for PSATD whenusing a current deposition scheme that satisfies Gauss's law. Relaxing thisconstraint maintains accuracy and yields a 30% speedup. Unlike Yee and CKC,PSATD is numerically stable at any time step, allowing for a larger time stepthan with the finite-difference methods. We found that increasing the time step2.4-3 times over the standard Yee step still yields accurate results, but onlytranslates to modest performance improvements over CKC due to the currentdeposition scheme used with PSATD. Further optimization of this scheme willlikely improve the effective performance of PSATD.

Particle-in-Cell Simulations of Relativistic Magnetic Reconnection with Advanced Maxwell Solver Algorithms