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Idomura, Yasuhiro; Dif-Pradalier, G.*; Garbet, X.*; Sarazin, Y.*; Tore Supra Teams*
no journal, ,
LOC-SOC (linear and saturated ohmic confinement) transition phenomena in ohmic plasmas on ToreSupra tokamak were analyzed using full-f gyrokinetic simulations on Fugaku, and transition from trapped electron mode turbulence to ion temperature gradient driven turbulence was confirmed between LOC phase (low density, high Zeff) and SOC phase (high density, low Zeff). Numerical experiments qualitatively recovered experimental observations such as changes in energy confinement times and intrinsic rotation profiles, and exhaust of carbon impurity ions.
Wakai, Eiichi; Noto, Hiroyuki*; Kano, Sho*; Makimura, Shunsuke*; Ishida, Taku*; Shibayama, Tamaki*
no journal, ,
It is important for materials and devices that are subjected to high-energy particle beams to be able to withstand high thermal loads and irradiation. In this study, we investigated the irradiation resistance of nanoparticle-dispersed W (tungsten) and 1.1 wt% TiC-doped nanoparticle-dispersed W materials with a grain size of 1-2 
m and high strength, which were fabricated by mechanical alloying and high-temperature isostatic sintering. The irradiation was carried out at the HIT ion irradiation facility at the University of Tokyo at 773 K to about 0.7 dpa using tungsten ions, which are self ions. After the irradiation, the irradiation resistance of the materials was measured using a nanoindenter, and the results showed that the former material changed, while the latter material did not show any irradiation hardening.