Adjoint Monte Carlo calculation of charged plasma particle flux to wall

TL;DR

This paper introduces an adjoint Monte Carlo method to efficiently compute charged plasma particle fluxes to tokamak walls, demonstrated through applications in fusion diagnostics and neutral beam loss measurements.

Contribution

It presents a novel adjoint Monte Carlo approach that simplifies collision modeling, enabling accurate flux calculations for plasma-wall interactions in fusion devices.

Findings

Effective calculation of plasma particle fluxes without collisions

Application to fusion product activation probes

Application to neutral beam injection loss diagnostics

Abstract

This manuscript describes an adjoint/reverse Monte Carlo method to calculate the flux of charged plasma particles to the wall of e.g. a tokamak. Two applications are described: a fusion product activation probe and a neutral beam injection prompt loss measurement with a fast ion loss diagnostic. In both cases, the collisions of the particles with the background plasma can be omitted.