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Fusion Energy
This division promotes the development and timely introduction of fusion energy as a sustainable energy source with favorable economic, environmental, and safety attributes. The division cooperates with other organizations on common issues of multidisciplinary fusion science and technology, conducts professional meetings, and disseminates technical information in support of these goals. Members focus on the assessment and resolution of critical developmental issues for practical fusion energy applications.
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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.
Yasufumi Tanaka, Heun Tae Lee, Yoshio Ueda, Masayoshi Nagata, Yusuke Kikuchi, Satoshi Suzuki, Yohji Seki
Fusion Science and Technology | Volume 68 | Number 2 | September 2015 | Pages 433-437
Technical Paper | Proceedings of TOFE-2014 | doi.org/10.13182/FST15-109
Articles are hosted by Taylor and Francis Online.
In this study, surface damaged W monoblocks (melting and cracking) by a pulsed plasma gun and an e-beam devices were exposed to cyclic heat loads (simulating normal heat loads and slow transients) and pulsed heat loads (simulating ELMs) to observe the effects of surface damage on surface erosion and heat removal capability. Heat load tests simulating the normal heat load (10 MW/m2, 10 sec, 300 cycles) and the slow transient (~20 MW/m2, 10 sec, 300 cycles) were performed by the e-beam. The surface morphology changes after the heat load tests were observed using laser scanning microscopy and FE-SEM. After e-beam irradiation of ~20 MW/m2, the longitudinal cracks crossing over entire monoblocks appeared on the surfaces of all monoblocks. Recrystallization and additional crack formation were also observed on the surface. However, there was no significant change of heat removal capability. In the additional pulsed heat load test, the energy fluence of 0.042-0.30MJ/m2 was applied with pulse numbers of 103 and 104.The surface morphology changes after laser irradiation were observed using laser scanning microscope. After laser irradiation, the grain ejection occurred above a certain energy fluence (~25 % of melting threshold).