Abstract
Since a few years, simulation codes were built at CEA Cadarache to predict the signal of ionisation chambers and taylor detectors for specific applications. It is proposed here to present COSICAF, a tool developed for mainly academic purpose and rapid fission chamber prototyping. This numerical simulation, mostly based on semi-empirical models and Monte-Carlo method will help students to understand how ionisation chambers work. Through the paper, models and their numerical implementation will be discussed. A focus is made on recently implemented features like charge multiplication and correlated source which make the simulation of proportional counter possible. To demonstrate the interest of the code, simulations of a planar fission chamber is proposed.
Highlights
Ionisation chambers sensitive to neutron flux and fission chambers play a key role in nuclear industry where they are used mainly for core neutron monitoring
Those detectors are constituted of a gastight body which contains at least two polarised electrodes, a volume of noble gas and an active material such as a fissile deposit
When a neutron travels trough the detector, it has a chance to react with the active material, producing energetic heavy ions
Summary
Ionisation chambers sensitive to neutron flux and fission chambers play a key role in nuclear industry where they are used mainly for core neutron monitoring. Those detectors are constituted of a gastight body which contains at least two polarised electrodes, a volume of noble gas and an active material such as a fissile deposit. COSICAF [3], an open source software written in Octave/Matlab[4] was developed at the instrumentation, sensor and dosimetry laboratory of CEA Cadarache This tool is part of the decade effort of our team on fission chamber simulation. In the last part of the paper one example of simulation, a planar fission chamber built by the CEA fission chamber workshop is discussed
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