Articolo in rivista, 2018, ENG, 10.1016/j.nme.2018.05.013

Adhesive force distributions for tungsten dust deposited on bulk tungsten and beryllium-coated tungsten surfaces

Tolias P.; Riva G.; De Angeli M.; Ratynskaia S.; Daminelli G.; Lungu C.P.; Porosnicu C.

1,4: Space and Plasma Physics, KTH Royal Institute of Technology, Teknikringen 31, Stockholm, 10044, Sweden / 2,5: Institute of Condensed Matter Chemistry and Energy Technologies, Consiglio Nazionale delle Ricerche, via Cozzi 53, Milan, 20125, , Italy / 3: Istituto di Fisica del Plasma, Consiglio Nazionale delle Ricerche, via Cozzi 53, Milan, 20125, Italy / 6,7: National Institute for Laser, Plasma and Radiation Physics (NILPRP), Magurele-Bucharest, 077125, Romania

Comprehensive measurements of the adhesive force for tungsten dust adhered to tungsten surfaces have been performed with the electrostatic detachment method. Monodisperse spherical dust has been deposited with gas dynamics techniques or with gravity mimicking adhesion as it naturally occurs in tokamaks. The adhesive force is confirmed to follow the log-normal distribution and empirical correlations are proposed for the size-dependence of its mean and standard deviation. Systematic differences are observed between the two deposition methods and attributed to plastic deformation during sticking impacts. The presence of thin beryllium coatings on tungsten surfaces is demonstrated to barely affect adhesion.

Nuclear materials and energy 15 , pp. 55–63

Keywords

adhesion force; tokamaks; dust; tungsten dust; beryllium

CNR authors

De Angeli Marco, Daminelli Giambattista, Riva Giulio

CNR institutes

ICMATE – Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia, IFP – Istituto di fisica del plasma "Piero Caldirola"