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Advances in High Energy Physics
Volume 2013 (2013), Article ID 821709, 6 pages
Research Article

Neutron Noise Analysis with Flash-Fourier Algorithm at the IBR-2M Reactor

1Institute for Physics and Nuclear Engineering, DFCTI, Magurele, 76900 Bucharest, Romania
2Joint Institute for Nuclear Research, FLNP, Dubna, Moscow 141980, Russia

Received 19 September 2013; Accepted 17 November 2013

Academic Editor: Carlo Cattani

Copyright © 2013 Mihai O. Dima et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Neutron noise spectra in nuclear reactors are a convolution of multiple effects. For the IBR-2M pulsed reactor (JINR, Dubna), one part of these is represented by the reactivities induced by the two moving auxiliary reflectors and another part of these by other sources that are moderately stable. The study of neutron noise involves, foremostly, knowing its frequency spectral distribution, hence Fourier transforms of the noise. Traditional methods compute the Fourier transform of the autocorrelation function. We show in the present study that this is neither natural nor real-time adapted, for both the autocorrelation function and the Fourier transform are highly CPU intensive. We present flash algorithms for processing the Fourier-like transforms of the noise spectra.