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Performance investigation of the pulse and Campbelling modes of a fission chamber using a Poisson pulse train simulation code

Zsolt Elter (Institutionen för teknisk fysik, Nukleär teknik) ; C. Jammes ; Imre Pázsit (Institutionen för teknisk fysik, Nukleär teknik) ; L. Pal ; P. Filliatre
Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment (0168-9002). Vol. 774 (2015), p. 60-67.
[Artikel, refereegranskad vetenskaplig]

The detectors of the neutron flux monitoring system of the foreseen French GEN-IV sodium-cooled fast reactor (SFR) will be high temperature fission chambers placed in the reactor vessel in the vicinity of the core. The operation of a fission chamber over a wide-range neutron flux will be feasible provided that the overlap of the applicability of its pulse and Campbelling operational modes is ensured. This paper addresses the question of the linearity of these two modes and it also presents our recent efforts to develop a specific code for the simulation of fission chamber pulse trains. Our developed simulation code is described and its overall verification is shown. An extensive quantitative investigation was performed to explore the applicability limits of these two standard modes. It was found that for short pulses the overlap between the pulse and Campbelling modes can be guaranteed if the standard deviation of the background noise is not higher than 5% of the pulse amplitude. It was also shown that the Campbelling mode is sensitive to parasitic noise, while the performance of the pulse mode is affected by the stochastic amplitude distributions.

Nyckelord: Neutron flux monitoring, Fission chamber, Filtered Poisson process, Simulation, Pulse mode



Denna post skapades 2015-02-05.
CPL Pubid: 212208

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)

Ämnesområden

Teknisk fysik

Chalmers infrastruktur