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ANS Student Conference 2025
April 3–5, 2025
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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.
Kameo Ishii, Tetsuya Goto, Yasuhiro Goi, Nagayoshi Kikuno, Yuzo Katsuki, Masao Nagasaki, Yoshihiro Ono, Nobutsugu Ishibashi, Motoo Nakamura, Isao Katanuma, Atsushi Mase, Makoto Ichimura, Akiyosi Itakura, Teruo Tamano, Kiyoshi Yatsu
Fusion Science and Technology | Volume 35 | Number 1 | January 1999 | Pages 175-179
Oral Presentations | doi.org/10.13182/FST99-A11963846
Articles are hosted by Taylor and Francis Online.
Gentle hump structure on energy spectra of end-loss ions was observed in the RF driven tandem mirror plasma by use of an end-loss energy component analyzer (ELECA), which has been developed in order to directly measure velocity distribution functions of the end-loss ions.1 Ions are heated anisotropically in the central cell of the tandem mirror by the ICRF wave injection, and Alfvén ion-cyclotron (AIC) fluctuations are excited due to the anisotropic ion temperature.2 The correlation between the hump structure and the excitation of the AIC fluctuations was observed experimentally. From the viewpoints of the heating characteristics and the resonance condition, the hump energy was estimated and successfully compared with the experimetal results. Influence of the ICRF waves on the hump structure was investigated using a bounce averaged Fokker Planck code.3 The AIC fluctuations enhance the end-loss ions scattered from the trapped region to the loss region, and have direct effects upon the ion confinement. The energy flux of the enhanced end-loss ions due to the AIC fluctuations was estimated and the enhancement factor was obtained. The strong anisotropic ion heating is dangerous for the ion confinement in the open systems which contain necessarily the loss regions.
