Impact of ion irradiation and film deposition on optical and fuel retention properties of Mo polycrystalline and single crystal mirrors

Dittrich, LauraKTH,Elektromagnetism och fusionsfysik,KTH Royal Inst Technol, SE-10044 Stockholm, Sweden. (författare)

QC 20231218
Polycrystalline (PC) and single crystal (SC) molybdenum mirrors were irradiated with 98Mo+, 1H+, 4He+, 11B+ and 184W+. Energies were chosen to impact the optically active region (up to 30 nm deep) of Mo mirrors. Some surfaces were coated by magnetron sputtering either with B or W films 4–65 nm thick. The overall objective was to simulate the neutron-induced damage and transmutation (H, He), and the impact of H, He, B, W on the optical performance of test mirrors, and on fuel retention. In parallel, a set of PC Mo mirrors irradiated with 1.6 MeV 98Mo3+ to a damage of 2 dpa and 20 dpa was installed in the JET tokamak for exposure during deuterium-tritium campaigns. Data from spectrophotometric, ion beam and microscopy techniques reveal: (i) the irradiation decreased specular reflectivity, whereby the differences between PC and SC in reflectivity are very small, (ii) He is retained in bubbles within 25–30 nm of the subsurface layer in all irradiated materials, (iii) W, either deposited or implanted, decreases reflectivity, but the strongest reflectivity degradation is caused by B deposition. Laboratory studies show the correlation of damage and H retention. Several cycles of W deposition and its removal from SC-Mo mirrors by plasma-assisted methods were also performed.

Petersson, PerKTH,Elektromagnetism och fusionsfysik,KTH Royal Inst Technol, SE-10044 Stockholm, Sweden.(Swepub:kth)u1mnanst (författare)
Laabadi, HafssaKTH,KTH Royal Inst Technol, SE-10044 Stockholm, Sweden.(Swepub:kth)u1t6zjt4 (författare)
Pitthan, EduardoUppsala universitet,Tillämpad kärnfysik(Swepub:uu)edupi954 (författare)
Rubel, MarekUppsala universitet,KTH,Elektromagnetism och fusionsfysik,Uppsala University, SE-751 20 Uppsala, Sweden,Tandemlaboratoriet,Tillämpad kärnfysik,KTH Royal Inst Technol, SE-10044 Stockholm, Sweden(Swepub:uu)marru771 (författare)
Widdowson, A.Culham Centre for Fusion Energy, Abingdon OX14 3DB, United Kingdom,Culham Ctr Fus Energy, Abingdon OX14 3DB, England. (författare)
Krawczyńska, A.Warsaw University of Technology, 02-507 Warsaw, Poland,Warsaw Univ Technol, PL-02507 Warsaw, Poland. (författare)
Szlązak, K.Warsaw University of Technology, 02-507 Warsaw, Poland,Warsaw Univ Technol, PL-02507 Warsaw, Poland. (författare)
Ciupiński, Ł.Warsaw University of Technology, 02-507 Warsaw, Poland (författare)
Ciupinski, L.Warsaw Univ Technol, PL-02507 Warsaw, Poland. (författare)
KTHElektromagnetism och fusionsfysik (creator_code:org_t)

Av författaren/redakt...: Dittrich, Laura; Petersson, Per; Laabadi, Hafssa; Pitthan, Eduardo; Rubel, Marek; Widdowson, A.; visa fler...; Krawczyńska, A.; Szlązak, K.; Ciupiński, Ł.; Ciupinski, L.; visa färre...

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