| S. Panebianco, P. Beauvais, O. Bringer, S. Chabod, F. Chartier, E. Dupont, A. Letourneau, P. Lotrus, L. Oriol, F. Molinie, J. Ch. Toussaint |
The MEGAPIE project is a key experiment on the road to Accelerator Driven Systems and it provides the scientific
community with unique data on the behavior of a liquid lead-bismuth spallation target under realistic and long term
irradiation conditions. The neutronic of such target is of course of prime importance when considering its final
destination as an intense neutron source. This is the motivation to characterize the inside neutron flux of the
target in operation. A complex detector, made of 8 “micro” fission-chambers, has been built and installed in the
core of the target, few tens of centimeters from the proton/Pb-Bi interaction zone. This detector is designed
to measure the absolute neutron flux inside the target, to give its spatial distribution and to correlate its
temporal variations with the beam intensity. Moreover, integral information on the neutron energy distribution
as a function of the position along the beam axis could be extracted, giving integral constraints on the neutron
production models implemented in transport codes such as MCNPX. |
