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Calibration of the gamma-ray measurement procedure in the EAST neutron activation system

机译:EAST中子活化系统中伽马射线测量程序的校准

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A neutron activation system based on pneumatic transfer system has been employed to measure the time-integrated neutron yield for the Experimental Advanced Superconducting Tokamak (EAST). Those DD neutrons were detected by indium with the reaction of In-115(n, n') In-115m, the energy threshold of the reaction was 0.3MeV which was capable of eliminating the interference of scatting neutrons. A small amount of DT neutron generated by the deuterium plasma was detected by silicon with the reaction of Si-28(n, p)Al-28, the energy threshold was 4 MeV so as to discriminate the DD neutron from DT neutron. The gamma spectrum of activated samples was obtained with high purity germanium spectrometer. The efficiency for the measurement of fusion neutrons were calibrated by DD/DT neutron accelerator. The key coefficients using to calculate the neutron flux by characteristic gamma peak counts have been obtained in this calibration. Furthermore, investigation of the thickness of samples in order to cover the wide range of neutron yields was performed. The neutron activation system was implemented to the measurement of fusion neutron yield in EAST from the experiment campaign of 2018, and obtained a linear with deviation less than +/- 10% comparing with fission chamber.
机译:基于气动传输系统的中子活化系统已被用于测量实验高级超导托卡马克(EAST)的时间积分中子产率。铟与In-115(n,n')In-115m的反应通过铟检测到这些DD中子,该反应的能量阈值为0.3MeV,能够消除散射中子的干扰。硅在Si-28(n,p)Al-28的反应下,通过氘检测到了由氘等离子体产生的少量DT中子,能量阈值为4 MeV,从而将DD中子与DT中子区分开来。用高纯度锗光谱仪获得了活化样品的γ谱。用DD / DT中子加速器校准了测量聚变中子的效率。在此校准中已获得用于通过特征性伽马峰计数来计算中子通量的关键系数。此外,为了覆盖广泛的中子产率,对样品的厚度进行了研究。从2018年的实验活动开始,中子活化系统用于测量EAST中的聚变中子产率,并且与裂变室相比线性偏差小于+/- 10%。

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