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Advanced high-temperature ultracentrifuge apparatus for mega-gravity materials science

Mashimo, Tsutomu; Huang, X.; Osakabe, Toyotaka; Ono, Masao*; Nishihara, Masamichi*; Ihara, Hirotaka*; Sueyoshi, Masanori*; Shibasaki, Koji*; Shibasaki, Shiro*; Mori, Nobuo*

An ultracentrifuge apparatus, which could generate an ultra-strong gravitational field of even $$>$$1,000,000 (1 million) G (1G = 9.8 m/s$$^{2}$$) in a wide temperature range up to $$>$$ 500$$^{circ}$$C with high stability controls, was developed for new materials science research. The system consisted of an air turbine motor with ceramic ball bearings and dumper section, a sample rotor with an outer diameter up to 160 mm, a vacuum chamber and a heating system. The ultracentrifuge experiments using the 70 and 80 mm-diam rotors made of titanium alloy with rotational speeds of up to 170,000 rpm at temperatures of even over 200$$^{circ}$$C for 100 hours with the ripples of $$<$$ 0.05% and $$<$$ 1 degree, respectively, were successfully performed, where the maximum gravitational field at sample was $$>$$1,000,000 G, and the potential energy and sample volume were larger than those of the Kumamoto University one (Rev. Sci. Instr. 67, 3170 (1996)) by $$>$$ 1.9 and $$>$$ 4 times, respectively.

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