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Improved neutron activation dosimetry for fusion

机译:改进的中子活化剂量法

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Neutron activation technique has been widely used for the monitoring of neutron fluence at the Joint European Torus (JET) whereas it is foreseen to be employed at future fusion plants, such as ITER and DEMO. Neutron activation provides a robust tool for the measurement of neutron fluence in the complex environment encountered in a tokamak. However, activation experiments previously performed at JET showed that the activation foils used need to be calibrated in a real fusion environment in order to provide accurate neutron fluence data. Triggered by this challenge, an improved neutron activation method for the evaluation of neutron fluence at fusion devices has been developed. Activation assemblies similar to those used at JET were irradiated under 14 MeV neutrons at the Frascati Neutron Generator (FNG) reference neutron field. The data obtained from the calibration experiment were applied for the analysis of activation foil measurements performed during the implemented JET Deuterium-Deuterium (D-D) campaign. The activation results were compared against thermoluminescence measurements and a satisfactory agreement was observed. The proposed method provides confidence on the use of activation technique for the precise estimation of neutron fluence at fusion devices and enables its successful implementation in the forthcoming JET Deuterium-Tritium (D-T) campaign.
机译:中子活化技术已广泛用于监测欧洲联合圆环(JET)的中子注量,而预计它将在未来的聚变工厂(如ITER和DEMO)中使用。中子活化为在托卡马克中遇到的复杂环境中测量中子注量提供了一个强大的工具。但是,先前在JET进行的活化实验表明,所用的活化箔需要在真实的聚变环境中进行校准,以提供准确的中子注量数据。受此挑战的触发,已开发出一种用于评估聚变装置中中子注量的改进中子活化方法。在Frascati中子发生器(FNG)参考中子场下,在14 MeV中子下照射类似于JET的激活组件。从校准实验获得的数据用于在已实施的JET氘-氘(D-D)活动期间执行的活化箔测量结果的分析。将活化结果与热致发光测量结果进行比较,观察到令人满意的一致性。所提出的方法使人们对使用活化技术精确估计聚变装置中的中子注量有信心,并使其能够在即将到来的JET氘T(D-T)运动中成功实施。

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