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The Neutron Spectrum Determination of p-D 2 O Generator by the Dosimetry -Foil Method

Nuclear Physics Institute of the ASCR Faculty of Nuclear Sciences and Physical Engineering of the CTU in Prague. The Neutron Spectrum Determination of p-D 2 O Generator by the Dosimetry -Foil Method. M. Štefánik *) , P. Bém, M. Honusek, K. Katovský,

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The Neutron Spectrum Determination of p-D 2 O Generator by the Dosimetry -Foil Method

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  1. Nuclear Physics Institute of the ASCR Faculty of Nuclear Sciences and Physical Engineeringof the CTU in Prague The Neutron Spectrum Determination ofp-D2O Generator by the Dosimetry-Foil Method M. Štefánik*), P. Bém, M. Honusek, K. Katovský, M.Majerle, J. Novák, and E. Šimečková *) Department of NuclearReactions NPI ASCR, pri, 250 68 Řež, Czech Republic Department of NuclearReactors FNSPE CTU, V Holešovičkách 2, 180 00 Prague 8, Czech Republic E-mail: milan.stefanik@fjfi.cvut.cz AER Working Group F – „Spent Fuel Transmutation“ and INPRO IAEA Collaborative Project SYNERGIES

  2. Content of presentation • Goals of experiments • Motivation • Experimental equipment • D2O-target station • Activation method • Measurement of p-D2O neutron spectrum • Specification of experiments, set-up, results • MCNPX calculations • Conclusion The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method

  3. Goals of experiments • Neutron spectrum determination of p-D2O generator • Specification of neutron field characteristic in low energy range • MCNPX model of heavy water target for direct neutron beam The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method

  4. Motivation • 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 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method

  5. IFMIF • 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 The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method

  6. D2O target stationof the NPI • Source of white neutron spectrum • Mean energy of 14 MeV, spectrum extending to 33 MeV • In negative ion mode of acceleration The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method

  7. Activation method The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method

  8. Neutron field spectrometry of p-D2O source #1 • Measurement of low-energy part of spectra (En < 4 MeV) • Two irradiation position • Field deformed by samples and devices The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method

  9. Neutron field spectrometry of p-D2O source #2 • 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 • Nuclearγ-spectrometrytechnique The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method

  10. Neutron field spectrometry of p-D2O source #3 • 21 activation reactions observed • Spectrum unfolded by modified SAND-II code • EAF-2007 library, MCNPX input spectrum The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method

  11. MCNPX model of heavy water target • Parallelproton beam (Ep = 36 MeV) • D2O layer, Si and PE plate • Nuclear data library: LA-150h, ENDF/B-VII • Input spectrum for SAND-II code The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method

  12. Conclusion • Dosimetry foil activation method used for IFMIF-likeneutron spectrum determination. • Spectral flux for energies less than 4 MeV relatively well known now. The Neutron Spectrum Determination of p-D2O Generator by the Dosimetry-Foil Method

  13. Thank you for your attention.

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