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• W3106468911 abstract "The $delta f$ particle-in-cell algorithm has been a useful tool in studying the physics of plasmas, particularly turbulent magnetized plasmas in the context of gyrokinetics. The reduction in noise due to not having to resolve the full distribution function indicates an efficiency advantage over standard (full-$f$) particle-in-cell. Despite its successes, the algorithm behaves strangely in some circumstances. In this work, we document a fully-resolved numerical instability that occurs in the simplest of multiple-species test cases: the electrostatic $Omega_H$ mode. There is also a poorly-understood numerical instability that occurs when one is under-resolved in particle number, which may require a prohibitively large number of particles to stabilize. Both of these are independent of the time-stepping scheme, and we conclude that they exist if the time advancement were exact. The exact analytic form of the algorithm is presented, and several schemes for mitigating these instabilities are presented." @default.
• W3106468911 created "2020-11-23" @default.
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• W3106468911 date "2016-05-01" @default.
• W3106468911 modified "2023-10-10" @default.
• W3106468911 title "Fundamental form of the electrostatic <i>δf</i>-PIC algorithm and discovery of a converged numerical instability" @default.
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• W3106468911 doi "https://doi.org/10.1063/1.4948493" @default.
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