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2024 ANS Annual Conference
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Fusion Science and Technology
Latest News
Strontium: Supply-and-demand success for the DOE’s Isotope Program
The Department of Energy’s Isotope Program (DOE IP) announced last week that it would end its “active standby” capability for strontium-82 production about two decades after beginning production of the isotope for cardiac diagnostic imaging. The DOE IP is celebrating commercialization of the Sr-82 supply chain as “a success story for both industry and the DOE IP.” Now that the Sr-82 market is commercially viable, the DOE IP and its National Isotope Development Center can “reassign those dedicated radioisotope production capacities to other mission needs”—including Sr-89.
L. Zang, T. Mizuuchi, N. Nishino, S. Ohshima, S. Yamamoto, Y. C. Sun, K. Kasajima, M. Takeuchi, K. Mukai, H. Y. Lee, N. Kenmochi, Y. Ohtani, K. Nagasaki, S. Kado, H. Okada, T. Minami, S. Kobayashi, N. Shi, S. Konoshima, Y. Nakamura, F. Sano
Fusion Science and Technology | Volume 68 | Number 4 | November 2015 | Pages 758-765
Technical Paper | doi.org/10.13182/FST14-862
Articles are hosted by Taylor and Francis Online.
In the medium-sized heliotron device Heliotron J, edge density fluctuation has been measured simultaneously with a high-speed video camera and a Langmuir probe. Poloidally propagating, parallel elongating filamentary structures with 20- to 30-kHz frequency and ~14-cm poloidal wavelength were observed by a camera. However, the radial position of this density mode is not well known with only camera data because the camera lens axis is perpendicular to the torus plane. To identify the span of this density mode, plasma-surface interaction (PSI) between the probe and the plasma has been analyzed. As the probe scanned into the plasma, enhanced brightness due to PSI was clearly observed in camera images. By comparing this enhanced brightness among different probe positions, the outmost margin of the 20- to 30-kHz mode observed by the camera has been identified to be within 10 mm outside from the last closed flux surface. This conclusion is supported by the spectrum of the probe data.