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Characterization of the DD-neutron source for the 80 degrees beam line of the Fusion Neutronics Source (FNS)

核融合中性子源FNSの80度ビームラインにおけるDD中性子の発生特性評価

近藤 恵太郎; 落合 謙太郎; 沓掛 忠三; 今野 力

Kondo, Keitaro; Ochiai, Kentaro; Kutsukake, Chuzo; Konno, Chikara

FNS施設において、重水素化チタンターゲットを用いたd-D中性子源を核融合中性子工学研究に利用するために、d-D中性子源の中性子発生特性の評価を行った。d-D反応による中性子の生成を反応の運動学に基づいて記述した。またMCNP計算のためにターゲットアッセンブリーを詳細にモデル化した。このMCNP計算の妥当性を確認するために、中性子源からの放出強度の角度分布を放射化箔法によって測定した。放射化箔の反応率はMCNPによる計算値とよく一致し、本計算の有効性を確認した。本計算の結果から、DD中性子を用いた実験の解析をMCNPで行うためのソース項を作成した。

In order to utilize the d-D neutron source with a titanium deuteride target of the FNS facility for fusion neutronics researchs, the specification of the d-D neutron source was investigated. The characteristic of neutrons produced by the d-D reaction was described based on the reaction kinematics and the target assembly of the accelarator was detailedly modeled for the MCNP calculation. In order to validate the MCNP model, the angular distribution of the neutron strength was measured with the foil activation method. The measured reaction rates were well predicted by the MCNP calculation and the validity of the present model was confirmed. Based on the model, a MCNP source term was prepared for usual analysis calculations of experiments with DD neutrons.

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