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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.
Robert Kin-Yan Wong, Edward C. Morse
Fusion Science and Technology | Volume 27 | Number 4 | July 1995 | Pages 364-376
Technical Paper | Plasma Heating System | doi.org/10.13182/FST95-A30357
Articles are hosted by Taylor and Francis Online.
A quasi-optical electron cyclotron maser operating at 28 GHz is studied for applications in heating fusion plasmas. Large spherical mirrors with a small axial aperture and coupling mirror form the open resonator. In the experiment, both the large mirror and coupling mirror are adjusted to select a preferential mode of operation. This is found to improve the efficiency of interaction. Maximum efficiency was observed with a 2.5-A, 60-kV electron beam, with efficiency declining at higher currents. Water calorimetry was used to measure an efficiency of 10%. A photon-drag detector indicated higher peak power levels than those measured with calorimetry. The high-efficiency mode was due to the overlap of two cavity eigenmodes TEMn00 and TEM(n−1)10 (cylindrical notation) and to beam trapping effects that caused a better match between the beam footprint and the electric field profile than in other configurations tested.
