Abstract
The study of nuclear fission is encountering renewed interest with the development of GEN-IV reactor concepts, mostly working in the neutron fast energy domain. To support the fast reactor technologies, new high quality nuclear data are needed. New facilities are being constructed to produce high intensity neutron beams from hundreds of keV to few tens of MeV (Licorne, NFS, nELBE, ...). They will open new opportunities to provide nuclear data. In this framework the development of an experimental setup called FALSTAFF for a characterisation of actinide fission fragments has been undertaken. Fission fragment yields and associated neutron multiplicities will be measured as a function of the neutron energy. Based on time-of-flight and residual energy technique, the setup will allow the simultaneous measurement of the complementary fragment velocity and energy. The FALSTAFF setup and the upgrade of the first arm prototype with the new ionisation chamber CALIBER will be presented. The performances of the experimental apparatus is discussed.
Highlights
The study of nuclear fission is encountering renewed interest with the development of GEN-IV reactor concepts, mostly working in the neutron fast energy domain
To study neutron-induced fission for fissile isotopes in the fast neutron energy range, the FALSTAFF spectrometer is under development at CEA-Saclay
The challenge of the FALSTAFF development is to take into account correctly the fission fragment energy losses in the detector materials for the correct mass and charge identification
Summary
The FALSTAFF [1, 2] instrument consists of two detector arms each containing two timing detectors with a position sensitive readout and an energy detector. Each arm is made of two TOF Secondary Electron Detectors (SeD), as two timing position sensitive detectors, and one axial ionisation chamber as the residual fission fragment energy detector. This feature makes the FALSTAFF goal very challenging to reach For this reason the technological aim is to reduce the thickness of material layers as much as possible and to measure the ion positions at a millimeter level accuracy on the different layers in order to calculate the crossed thickness and to apply reliable energy loss corrections. The TOF detectors consist in two Secondary Electron Detectors (SeD) [6, 7] separated by 50 cm These detectors are specially conceived to reduce the interaction between the fragments and the detector material as much as possible and, at the same time, to be able to track the trajectory of the incoming particle. These detectors allow to cover a large area without degrading the time and spatial resolution, which have been measured to be σt ∼ 120 ps and σX ∼ 1 mm, respectively[7]
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