CUP–A New High-Flux Irradiation Position at the ANITA Neutron Facility at TSL

Abstract

Abstract-A new irradiation position has been constructed, characterized, and put into operation at the ANITA facility in The Svedberg Laboratory (TSL) for accelerated testing of components and systems for single event effects. Results of beam characterization measurements are reported. The energyintegrated neutron flux above 10 MeV, amounting to more than 10 7 cm -2 •s -1 , is the highest among the facilities with atmosphericlike spectra. The employed characterization and simulation techniques are applicable for a broad class of neutron facilities.

Detailed Geant4 Simulations of the ANITA and ANITA-CUP Neutron Facilities

“…As CUP is upstream of the collimator the distribution is not circularly symmetric. In the central region the calculated neutron fluence rate above 10 MeV is 7.85 × 10 6 n cm −2 s −1 , compared to 1.17 × 10 7 n cm −2 s −1 from measurements [2]. The present results underestimate measurements at the CUP by 33%.…”

“…Simulations of a bare spallation target showed qualitative agreement with independent calculations and measurements of the fast neutron field [1]. The present work was motivated partly by a desire to investigate whether improvements to the geometry used in the simulations would lead to closer quantitative agreement with measurements, and partly by a need to extend the work to encompass the new ANITA-CUP facility [2].…”

“…Fig. 5 compares calculated spectra at SUP and CUP with analytical fits based on MCNPX simulations and TOF measure- [2]. The SUP data are also compared with results from Geant4 simulations of the bare target [3].…”

Research opportunities with compact accelerator-driven neutron sources

“…The energy-integrated neutron flux above 10 MeV amounts to more than 10 7 cm 2 s 1 with an atmospheric-like spectrum. Characterization measurements have confirmed that the availability of the neutron flux is currently the highest among the facilities of the same class [56]. …”

(n,xn) cross section measurements for Y-89 foils used as detectors for high energy neutron measurements in the deeply subcritical assembly “QUINTA”

“…The 7 Li target thickness amounted to 4 mm, except for the irradiation with neutron energy of 95.5 MeV, for which the target was 23.5 mm thick [11]. located at the distance 198 cm from the 7 Li target, in socalled Close User Position (CUP) [9].…”