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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.
J. Miyazawa, H. Yamada, R. Sakamoto, H. Funaba, K. Y. Watanabe, S. Sakakibara, K. Ida, M. Goto, T. Morisaki, S. Murakami, S. Inagaki, LHD Experiment Group
Fusion Science and Technology | Volume 58 | Number 1 | July-August 2010 | Pages 29-37
Chapter 3. Confinement and Transport | Special Issue on Large Helical Device (LHD) | doi.org/10.13182/FST10-A10790
Articles are hosted by Taylor and Francis Online.
Global energy confinement in the Large Helical Device has been proved to be comparable to those of tokamaks in ELMy H-mode. It shows a gyro-Bohm-like property as seen in international stellarator scalings. This implies that the anomalous transport dominates the neoclassical transport. At least in the configurations with small helical ripples, no significant collisionality dependence predicted by the neoclassical theory has been observed. Confinement degradation compared with the international stellarator scalings often takes place in the plasmas with high peripheral density. In many cases, this is due to the shallow penetration of heating beams. Adding to this, deviation from gyro-Bohm can be caused by the emergence of a "weak temperature dependence" of the thermal diffusivity. It depends on the plasma parameters whether this weak temperature dependence deteriorates or improves the thermal transport. The central pressure that is also an important parameter for envisioning a fusion reactor is not necessarily proportional to the global confinement. The central pressure is insensitive to the variation of magnetic configuration that strongly affects the global confinement.