This experimental activity, part of the Hydrogen Permeation CRP, focuses on Thermal Desorption Spectrometry (TDS). TDS has become a standard tool in the research of dynamical behaviour of hydrogen in fusion reactor materials. TDS provides assessment on the magnitude of chemical effects related to fusion fuel retention, trapping, release, diffusion, mobility and permeation in these materials. The TDS4F coordinated activity provides identically prepared samples using three different methodologies to be used by TDS facilities participating the CRP.

Sample types

High-energy implantations of D in W

• Material: ITER-grade rolled W (provided by S. Möller, Forschunszentrum Jülich, Germany)
• Preparation: polished, recrystallized
• Method: 50 keV/D and 200 keV/D at 400 K with fluence 2´1019 D/m2
• Post-characterisation: NRA

D plasma exposed W

• Material: rolled W Plansee (provided by T. Schwarz-Selinger, IPP Garching, Germany)
• Preparation: polished, recrystallized, pre-damaged with 20 MeV W ion beam
• Method: D plasma exposure at low energies (200 eV/D) and with medium fluxes (1020 D/m²s)
• Post-characterisation: NRA

D gas-loaded W

• Material: W Plansee (provided by T. Ahlgren, University of Helsinki)
• Preparation: polished, recrystallized, pre-damaged with 4 MeV W ion beam
• Method: D₂ gas exposure at 250 °C and 1 atm for 24 hrs
• Post-characterisation: ERDA, SIMS, PAS

For more information please contact fusion-data@iaea.org.