本文選題：Rossi-α方法 + 中子噪聲分析　； 參考：《強激光與粒子束》2017年05期

【摘要】：通過數(shù)值模擬手段研究了源強對Rossi-α測量的影響。為了定量研究中子源強對Rossi-α測量的影響,基于MCNP軟件;開發(fā)了用于計算Rossi-α分布的數(shù)值模擬工具。反應(yīng)堆模型和加速器驅(qū)動次臨界系統(tǒng)的示意模型的數(shù)值模擬結(jié)果被用于展示瞬發(fā)中子衰減常數(shù)與源強之間的關(guān)聯(lián)。數(shù)值模擬結(jié)果表明,入射源強源中子強度對Rossi-α測量結(jié)果有顯著影響。對于處于次臨界狀態(tài)的反應(yīng)堆和加速器驅(qū)動次臨界系統(tǒng)模型,在入射源強較小時,Rossi-α方法可以正確給出反應(yīng)堆中子衰減常數(shù),但當(dāng)入射源強較大時,測量不能給出正確的中子衰減常數(shù)。通過研究源強和測量結(jié)果的關(guān)系,可以找到能夠給出正確測量結(jié)果的最大可用源強。通過選擇一個可用源強范圍內(nèi)的較強中子源,可以減少測量所需時間。
[Abstract]:The effect of source strength on Rossi- 偽 measurement was studied by numerical simulation. In order to quantitatively study the influence of neutron source strength on Rossi- 偽 measurement, a numerical simulation tool for calculating Rossi- 偽 distribution is developed based on MCNP software. The numerical simulation results of the schematic model of reactor model and accelerator driven subcritical system are used to show the correlation between the instantaneous neutron attenuation constant and the source strength. The numerical simulation results show that the neutron intensity of the incident source has a significant effect on the Rossi- 偽 measurements. For the model of reactor and accelerator driven subcritical system in the subcritical state, the Rossi- 偽 method can correctly give the neutron attenuation constant of the reactor when the incident source intensity is small, but when the incident source intensity is large, The measurement does not give the correct neutron attenuation constant. By studying the relationship between the source strength and the measured results, the maximum available source strength which can give the correct measurement results can be found. By selecting a strong neutron source in the range of available sources, the measurement time can be reduced.
【作者單位】： 中國工程物理研究院戰(zhàn)略研究中心;中物院高性能數(shù)值模擬軟件中心;
【分類號】：O571.5

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本文編號：1873023