Modelling of fission chambers in current mode¿Analytical approach
Modelling of fission chambers in current mode¿Analytical approach
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DOI：
10.1016/j.nima.2006.06.067
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发表时间：
2006-10
影响因子：
1.4
通讯作者：
S. Chabod;G. Fioni;A. Letourneau;F. Marie
中科院分区：
文献类型：
--
作者：
S. Chabod;G. Fioni;A. Letourneau;F. Marie
提出了一个全面的理论模型来解释裂变室在电流模式下运行的功能，即使在非常高的中子通量。校准曲线计算作为裂变率，气体压力和几何形状的室的基本物理参数的函数。精确计算饱和时的输出电流，以及要施加的最大电压，以避免雪崩现象。由于空间电荷现象的电场失真也进行了估计。在这个模型中，裂变室的特征响应被正确地再现，与在ILL/格勒诺布尔高通量反应堆获得的经验反馈一致。
A comprehensive theoretical model is proposed to explain the functioning of fission chambers operated in current mode, even in very high neutron fluxes. The calibration curves are calculated as a function of basic physical parameters as fission rate, gas pressure and geometry of the chambers. The output current at saturation is precisely calculated, as well as the maximum voltage to be applied in order to avoid avalanche phenomena. The electric field distortion due to the space charge phenomena is also estimated. Within this model, the characteristic responses of fission chambers are correctly reproduced, in agreement with the experience feedback obtained at the ILL/Grenoble High-Flux Reactor.