Fission chambers designer based on Monte Carlo techniques working in current mode and operated in saturation regime

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• 作者：Alfonso Antolí ; nez^a ; ^{a.antolinez@alumnos.upm.es" class="auth_mail" title="E-mail the corresponding author} ; David Rapisarda^b
• 关键词：Fission chamber ; Simulation ; Design ; Monte Carlo ; Fission fragments ; Ionization chamber
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：21 July 2016
• 年：2016
• 卷：825
• 期：Complete
• 页码：6-16
• 全文大小：2514 K

文摘

Fission chambers have become one of the main devices for the measurement of neutron fluxes in nuclear facilities; including fission reactors, future fusion ones, spallation sources, etc. The main goal of a fission chamber is to estimate the neutron flux inside the facility, as well as instantaneous changes in the irradiation conditions. A Monte Carlo Fission Chamber Designer (MCFCD) has been developed in order to assist engineers in the complete design cycle of the fission chambers. So far MCFCD focuses on the most important neutron reactions taking place in a thermal nuclear reactor. A theoretical model describing the most important outcomes in fission chambers design has been developed, including the expected electrical signals (current intensity and drop in potential) and, current-polarization voltage characteristics (sensitivity and saturation plateau); the saturation plateau is the zone of the saturation curve where the output current is proportional to fission rate; fission chambers work in this region. Data provided by MCFCD are in good agreement with measurements available.