M. Štefánik *), P. Bém, M. Honusek, K. Katovský, M. Majerle, J. Novák, and E. Šimečková AER Working Group F – „Spent Fuel Transmutation“ and INPRO IAEA Collaborative Project SYNERGIES *) Department of Nuclear Reactions NPI ASCR, pri, Řež, Czech Republic Department of Nuclear Reactors FNSPE CTU, V Holešovičkách 2, Prague 8, Czech Republic

 Goals of experiments  Motivation  Experimental equipment ◦ D 2 O-target station  Activation method  Measurement of p-D 2 O neutron spectrum ◦ Specification of experiments, set-up, results  MCNPX calculations  Conclusion 27 January 2016 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method2

 Neutron spectrum determination of p-D 2 O generator ◦ Specification of neutron field characteristic in low energy range ◦ MCNPX model of heavy water target for direct neutron beam 27 January 2016 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method3

 IFMIF-like neutron spectrum simulation utilizing the NPI Cyclotron U-120M and NG-2 generator  Application of simulated IFMIF neutron field for testing Eurofer  Need for knowledge of neutron spectrum in whole energy range including the low energy part 27 January 2016 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method4

 International Fusion Material Irradiation Facility  Accelerator driven neutron source  Source reaction: d(40 MeV) + Li  Spectrum mean energy of 14 MeV  Testing of materials for fusion reactors Deuteron beam Neutron beam Liquid Li Chamber with samples 27 January 2016 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method5

 Source of white neutron spectrum  Mean energy of 14 MeV, spectrum extending to 33 MeV  In negative ion mode of acceleration 27 January 2016 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method6

 27 January 2016 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method7

 Measurement of low-energy part of spectra (E n < 4 MeV)  Two irradiation position  Field deformed by samples and devices 27 January 2016 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method8

 Proton (36 MeV) beam current of 8.4 µA  7 types of activation materials (Mn, Y, Mo, In, Lu, Cd and Au) ◦ From thermal to fast region  Nuclear γ-spectrometry technique 27 January 2016 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method9

 21 activation reactions observed  Spectrum unfolded by modified SAND-II code  EAF-2007 library, MCNPX input spectrum 27 January 2016 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method10

 Parallel proton beam (E p = 36 MeV)  D 2 O layer, Si and PE plate  Nuclear data library: LA-150h, ENDF/B-VII  Input spectrum for SAND-II code 27 January 2016 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method11

 Dosimetry foil activation method used for IFMIF-like neutron spectrum determination.  Spectral flux for energies less than 4 MeV relatively well known now. 27 January 2016 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method12