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Decommissioning & Environmental Sciences
The mission of the Decommissioning and Environmental Sciences (DES) Division is to promote the development and use of those skills and technologies associated with the use of nuclear energy and the optimal management and stewardship of the environment, sustainable development, decommissioning, remediation, reutilization, and long-term surveillance and maintenance of nuclear-related installations, and sites. The target audience for this effort is the membership of the Division, the Society, and the public at large.
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Fusion Science and Technology
Latest News
Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
Sung-Ryul Huh, Nam-Kyun Kim, Hyun-Joon Roh, Gon-Ho Kim
Fusion Science and Technology | Volume 68 | Number 1 | July 2015 | Pages 171-177
Technical Note | Open Magnetic Systems 2014 | doi.org/10.13182/FST14-887
Articles are hosted by Taylor and Francis Online.
A novel laser-assisted Hα spectroscopy is proposed to measure negative ion density in a hydrogen plasma. The laser-induced photodetachment of negative ions leads to a decrease in Hα intensity due to blocking of the mutual neutralization channel associated with generation of H (n=3) atoms. The relationship between the reduced Hα intensity and the negative ion density is investigated experimentally and analytically. It is observed that the reduced Hα intensity follows the trend in the negative ion density as a function of pressure, indicating that this spectroscopy holds promise for determining the negative ion density. In addition, a departure from linearity between the reduced Hα intensity and the negative ion density is also analyzed because it can affect the quantitative determination of the negative ion density in the laser-assisted Hα spectroscopy. The departure is found to be attributed to the change in the mutual neutralization reaction rates depending on plasma conditions.
