量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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This paper reports on the validation results for the stability of a liquid lithium (Li) target being intended for use as an intense fusion neutron source such as the International Fusion Materials Irradiation Facility (IFMIF), the Advanced Fusion Neutron Source (A-FNS), and the DEMO Oriented Neutron Source (DONES). The variation in the thickness of a Li target must be suppressed to within ±1 mm inside a deuteron beam footprint to both maintain the integrity of the Li target and guarantee the desired level of the neutron flux. We achieve a stable Li target with an average thickness variation of just 0.17 mm inside the beam footprint under standard IFMIF operating conditions (target speed: 15 m/s, vacuum pressure: 10−3 Pa, and Li temperature: 250 °C). Moreover, the mean and maximum wave amplitudes under such conditions were found to be 0.26 mm and 1.46 mm, respectively, at the beam center; these are small enough to satisfy the operational requirements. Finally, it was determined that the stability of the Li target remained unchanged despite using it for a period of 1,561 h. This finding is regarded as a significant step toward the realization of the IFMIF and the potential use of relevant neutron sources such as A-FNS and DONES.
Validation of Liquid Lithium Target Stability for an Intense Neutron Source
