Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2016-11-01

Journal: 12th International Symposium on Fusion Nuclear Technology (ISFNT)

Included Journals: Scopus、CPCI-S、EI、SCIE

Volume: 109

Page Number: 213-217

ISSN: 0920-3796

Key Words: Tungsten; Plasma surface interaction; Particle-in-cell method; Monte carlo method; Impurity transport

Abstract: Tungsten (W) is fore seen as one of the most important candidates of the plasma-facing materials (PFM) for future fusion devices, due to its beneficial properties. However, the high-Z characteristic makes it a potential contamination to the core plasma. Divertor is the main component that directly contacts the plasma, therefore, it is very important to understand the erosion of W divertor plate and the corresponding transport of the eroded wall impurity, especially during edge localized modes (ELMs). In this work, a one dimension-in-space and three-dimensions-in-velocity particle-in-cell code (EPPIC1D) is used to simulate the erosion of W divertor plate, and the transport of eroded W impurity near the divertor plate is studied by a Monte Carlo code. Benefiting from the kinetic simulation, energy/particle flux to the target could be calculated accurately, and the erosion of W plate by different species is simulated during ELMs. The trajectories and distributions of eroded W impurity particles are demonstrated, which shows us a basic idea of how these impurity particles are generated and transported. It is found that C3+ plays a dominated role on the erosion of W divertor plate during ELMs even when its concentration is low. Both W atoms and ions distribute mainly near the divertor plate, indicating only a very small fraction of W impurity particles could escape from divertor region and penetrate into the core plasma. (C) 2016 Elsevier B.V. All rights reserved.