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Fusion Science and Technology
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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.
Toyoaki Kimura, Kenichi Kurihara, Youichi Kawamata, Kenichi Akiba, Minoru Takahashi, Tsunehisa Terakado, Ryuji Yoshino
Fusion Science and Technology | Volume 32 | Number 3 | November 1997 | Pages 404-415
Technical Paper | Plasma Control Issues for Tokamaks | doi.org/10.13182/FST97-A4
Articles are hosted by Taylor and Francis Online.
A review on the plasma position and current control system for the JT-60 upgrade is presented. In the control system, advanced digital technologies such as the versa module Europe bus, the computer automated measurement and control technology, and Ethernet are applied to fast equilibrium control of the vertically elongated divertor plasmas. The delay of the overall feedback loop with a sampling period of 0.25 ms is <1.3 ms, including the delay of the power supply for the horizontal field coil. Multivariable control with matrix gain has been adopted in the system for decoupling control of the equilibrium parameters such as the plasma current and the horizontal position. The idea of an "algorithm number preprogram" was newly introduced into the control system for more flexible control. This made it possible to dynamically switch the control algorithms at any time of plasma pulse discharge. Several experiences in plasma control are presented. The development of a real-time plasma shape visualization system for advanced monitoring and control is also described.