CNR ExploRA

Articolo in rivista, 2017, ENG, 10.1016/j.nme.2016.10.021

Tungsten dust remobilization under steady-state and transient plasma conditions

Ratynskaia S.; Tolias P.; De Angeli M.; Weinzettl V.; Matejicek J.; Bykov I.; Rudakov D. L.; Vignitchouk L.; Thorén E.; Riva G.; Ripamonti D.; Morgan T.; Panek R.; De Temmerman G.

1,2,8,9 : Space and Plasma Physics - KTH Royal Institute of Technology, Teknikringen 31, 10044 Stockholm, Sweden / 3 : Istituto di Fisica del Plasma - Consiglio Nazionale delle Ricerche, via Cozzi 53, 20125 Milan, Italy / 4,5,13 : Institute of Plasma Physics, The Czech Academy of Sciences, Prague, Czech Republic / 6,7 : University of California, San Diego, La Jolla, CA 92093-0417, United States / 10,11 : Institute of Condensed Matter Chemistry and Energy Technologies - Consiglio Nazionale delle Ricerche, via Cozzi 53, 20125 Milan, Italy / 12 : FOM Institute DIFFER, Dutch Institute For Fundamental Energy Research, Eindhoven, Netherlands / 14 :ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, France

Remobilization is one of the most prominent unresolved fusion dust-relevant issues, strongly related to the lifetime of dust in plasma-wetted regions, the survivability of dust on hot plasma-facing surfaces and the formation of dust accumulation sites. A systematic cross-machine study has been initiated to investigate the remobilization of tungsten micron-size dust from tungsten surfaces implementing a newly developed technique based on controlled pre-adhesion by gas dynamics methods. It has been utilized in a number of devices and has provided new insights on remobilization under steady-state and transient conditions. The experiments are interpreted with contact mechanics theory and heat conduction models.

Nuclear materials and energy 12 , pp. 569–574