Plasma-arc lamp high heat flux cycling exposure of neutron irradiated tungsten materials

L. M. Garrison, A. S. Sabau, B. Gregory, J. W. Geringer, Y. Katoh, Y. Hamaji, A. Hasegawa

Research output: Contribution to journalConference articlepeer-review

Abstract

Thick plate, unalloyed W was neutron irradiated in the High Flux Isotope Reactor (HFIR) at 550 °C to a fast fluence of 1.24 × 1025 n m-2 E > 0.1 MeV (∼0.24 dpa). Unirradiated and irradiated specimens of the material were high heat flux (HHF) tested in the Plasma Arc Lamp (PAL) facility. The PAL uses a high-power photon source to provide a broad and even heat distribution on the sample surface. To simulate on/off cycling of normal operating plasma, the samples were exposed to approximately 800 cycles at 4.73 MW m-2 absorbed heat flux (incident heat fluxes of 10.95 MW m-2). After PAL exposure, slight changes were observed on the surfaces of the samples with SEM. The samples showed some annealing in the near surface polished region, but they were all below the damage threshold for cracking or other destructive features. The PAL has a large parameter space for future testing. The use of the HFIR and PAL to sequentially expose neutron irradiated samples to HHF will be a powerful tool for understanding materials behavior in a fusion-like environment.

Original languageEnglish
Article number014077
JournalPhysica Scripta
Volume2020
Issue numberT171
DOIs
Publication statusPublished - 2020 Jan 1
Event17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019 - Eindhoven, Netherlands
Duration: 2019 May 202019 May 24

Keywords

  • fusion materials
  • high heat flux
  • neutron irradiation
  • plasma facing component
  • tungsten

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

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