Production and measurement of neutron reference fields: the AMANDE facility and MIMAC prototype as neutron detection system.

10 Jun 2011, 11:15
30m

Speaker

Dr Lena Lebreton (IRSN)

Description

The AMANDE facility produces mono-energetic neutron fields from 2 keV to 20 MeV with a metrological quality [1]. To be considered as a standard facility, fluence and energy distributions of neutron fields have to be mastered, i.e. measured by primary detector standards. For this purpose, a new gaseous Time Projection Chamber (µTPC) is being developed within the MIMAC project devoted to directional Dark Matter search [2]. The µTPC is dedicated to measure neutron fields from 2 keV up to 1 MeV. The measurement strategy requires track reconstruction of recoiling nuclei down to a few keV, which can be achieved with low pressure gaseous detectors. Hence the energy must be measured precisely and the track of the recoiling nucleus must be 3D reconstructed. This is achieved with a low pressure micropattern gaseous detector (a pixelized bulk micromegas) equipped with a self triggered electronics able to perform the anode sampling at a 50 MHz frequency. Methods to measure fluence and neutron energy with the µTPC have been determined and confirmed with Monte Carlo simulations using realistic neutron fields produced by AMANDE. Detection efficiency and energy resolution of the µTPC have also been estimated. Preliminary experimental results will be shown. 1. V. Gressier et al, Rad. Prot. Dos. 110, 46-52 (2004). 2. J. Billard et al, Phys. Lett. B 691, 156-162 (2010).

Primary author

Dr Lena Lebreton (IRSN)

Presentation Materials