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2025 ANS Winter Conference & Expo
November 8–12, 2025
Washington, DC|Washington Hilton
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Latest News
Japan gets new U for enrichment as global power and fuel plans grow
President Trump is in Japan today, with a visit with new Prime Minister Sanae Takaichi on the agenda. Takaichi, who took office just last week as Japan’s first female prime minister, has already spoken in favor of nuclear energy and of accelerating the restart of Japan’s long-shuttered power reactors, as Reuters and others have reported. Much of the uranium to power those reactors will be enriched at Japan’s lone enrichment facility—part of Japan Nuclear Fuel Ltd.’s Rokkasho fuel complex—which accepted its first delivery of fresh uranium hexafluoride (UF₆) in 11 years earlier this month.
Keiji Tani, Masafumi Azumi, Tomonori Takizuka
Fusion Science and Technology | Volume 18 | Number 4 | December 1990 | Pages 625-632
Alpha Particles in Fusion Research | doi.org/10.13182/FST90-A29255
Articles are hosted by Taylor and Francis Online.
The feasibility of passive burn control method using toroidal field ripple-degraded alpha-particle confinement with free expansion of the major radius has been confirmed by a 1.5-dimensional transport code. In this transport code, a scaling of the ripple loss of alpha particles derived from the results of an orbit-following Monte Carlo code is used. For passive burn control, however, >5% of the major radius margin is necessary and the resulting ripple-induced power loss of alpha particles exceeds 20%. Passive burn control in combination with feedback control of the field ripple, a hybrid burn control method, demonstrates very effective burn temperature control. In hybrid burn control, the necessary major radius margin and the controlled field ripple are only 2 to 3% and δc ≲ 1%, respectively. The resulting total power loss of alpha particles is <15%.
