A backward Monte Carlo method for fast-ion-loss simulations

Filippo Zonta*, Lucia Sanchis, Eero Hirvijoki, ASDEX Upgrade Team

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)


This paper presents a novel scheme to improve the statistics of simulated fast-ion loss signals and power loads to plasma-facing components in fusion devices. With the so-called backward Monte Carlo method, the probabilities of marker particles reaching a chosen target surface can be approximately traced from the target back into the plasma. Utilizing the probabilities as a priori information for the well-established Forward Monte Carlo method, statistics in fast-ion simulations are significantly improved. For testing purposes, the scheme has been implemented to the ASCOT suite of codes and applied to a realistic ASDEX upgrade configuration of beam-ion distributions

Original languageEnglish
Article number026010
Number of pages12
JournalNuclear Fusion
Issue number2
Publication statusPublished - Jan 2022
MoE publication typeA1 Journal article-refereed


  • Monte Carlo
  • backward Monte Carlo
  • AUG
  • fast-ion losses
  • fast ions
  • FILD


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