On the accuracy of the binary-collision algorithm in particle-in-cell simulations of magnetically confined fusion plasmas

Timo P. Kiviniemi*, Eero Hirvijoki, Antti J. Virtanen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Ideally, binary-collision algorithms conserve kinetic momentum and energy. In practice, the finite size of collision cells and the finite difference in the particle locations affect the conservation properties. In the present work, we investigate numerically how the accuracy of these algorithms is affected when the size of collision cells is large compared with gradient scale length of the background plasma, a parameter essential in full-fusion plasma simulations. Additionally, we discuss implications for the conserved quantities in drift-kinetic formulations when fluctuating magnetic and electric fields are present: We suggest how the accuracy of the algorithms could potentially be improved with minor modifications.

Original languageEnglish
Article number905870219
Number of pages8
JournalJournal of Plasma Physics
Volume87
Issue number2
Early online date2021
DOIs
Publication statusPublished - 19 Apr 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • fusion plasma
  • plasma instabilities
  • plasma simulation

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