Bremen 2017 – scientific programme

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P: Fachverband Plasmaphysik

P 24: Plasma Wall Interaction

P 24.6: Talk

Thursday, March 16, 2017, 10:00–10:15, HS 1010

Emulation of fusion neutron damage studies by 30 MeV protons — •Rahul Rayaprolu, Sören Möller, and Christian Linsmeier — Institut für Energie- und Klimaforschung - Plasmaphysik, Forschungszentrum Jülich GmbH, 52425 Jülich

Fusion reactor first wall materials are anticipated to undergo detrimental changes in mechanical properties upon exposure to characteristic neutron flux. The increase in yield stress in conjugation with drop in strain with increasing dose, initiates brittle behaviour which leads to imminent failure of parts under thermal cycling. Thus mapping of thermo-mechanical properties under fusion irradiation conditions is a major concern needing to be addressed.

While the straightforward path is to subjugate test materials to fission reactor studies, they often are time consuming (1+ years) and low energy tail biased. We propose the use of high energy (15 - 30 MeV) protons, under depth/ thickness constraints (300 - 500 µm) to obtain fusion irradiation emulated macroscopic mechanical properties. This is seen to reduce the cycle time from years to months and has shown better conformity to simulated fusion reactor estimates (1 dpa irradiation). Additionally, established codes FISPACT-II and SPECTRA-PKA are applied to completely describe proton irradiation behavior on materials.