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Monte Carlo Simulations of Natural Uranium Setups Irradiated With Relativistic Deuterons

This paper presents Monte Carlo simulations of natural uranium setups irradiated with relativistic deuterons using the MCNPX code. The study includes a description of the setups, the method and models used in the simulations, beam monitoring and input parameters, computation results, and conclusion.

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Monte Carlo Simulations of Natural Uranium Setups Irradiated With Relativistic Deuterons

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  1. Nuclear Physics Institute, Academy of Sciences of the Czech Republic Department of Nuclear Reactors, Faculty of Nuclear Sciences andPhysical Engineering, Czech Technical University in Prague Martin Suchopár Monte Carlo Simulations of Natural Uranium Setups Irradiated With Relativistic Deuterons by Means of MCNPX Code XXI International Baldin Seminar on High Energy Physics Problems Relativistic Nuclear Physics and Quantum Chromodynamics JINR Dubna, Russia, September 10-15, 2012

  2. Outline • Energy + Transmutation & Kvinta setup description • Method and models used in MCNPX simulations • Beam monitoring and input parameters • Computation results • Conclusion Setup Method Results Beam monitors Conclusion

  3. Energy + TransmutationSetup • Setup • E+T setup • Kvinta setup • Method • Results • Beam monitors • Conclusion m natU = 206 kg

  4. Kvinta 2010 and 2011 Setup Kvinta 2010 setup Kvinta 2011 setup • Setup • E+T setup • Kvinta setup • Method • Results • Beam monitors • Conclusion • 3 sections • 4 detector plates • Pb shielding • 5 sections • 6 detector plates • no Pb shielding m natU = 315 kg m natU = 512 kg

  5. Kvinta-M 2011 Setup • Setup • E+T setup • Kvinta setup • Method • Results • Beam monitors • Conclusion

  6. Y Target sections (U-238) 114 120 p, d Z 0 r 40 Beam window, Ø 80 17 17 17 17 131 262 393 524 655 700 Kvinta-M 2011 Setup March 2011 irradiation • Setup • E+T setup • Kvinta setup • Method • Results • Beam monitors • Conclusion 6

  7. Y beam entrance window 150×150 mm mounting pits for detector plates 114 120 Z 0 r 40 d section U-238 17 131 17 17 17 262 lead shielding 100 mm 393 524 655 700 900 Kvinta-M 2011 Setup • Setup • E+T setup • Kvinta setup • Method • Results • Beam monitors • Conclusion December 2011 irradiation 7

  8. Kvinta-M 2011 Setup • Setup • E+T setup • Kvinta setup • Method • Results • Beam monitors • Conclusion

  9. Energy + Transmutation and Kvinta Irradiations • Setup • E+T setup • Kvinta setup • Irradiations • Method • Results • Beam monitors • Conclusion 9

  10. Energy + Transmutation and Kvinta Irradiations • Setup • E+T setup • Kvinta setup • Irradiations • Method • Results • Beam monitors • Conclusion 10

  11. QUINTA-M setup layout at the irradiation position Detector plates Target«Quinta-М» Pad with Pb foil monitor and SSNTD Plate (700х400х16) Platform Beam window Rails p, d SSNTD and AD positions on the QUINTA-M target surface • Setup • E+T setup • Kvinta setup • Irradiations • Method • Results • Beam monitors • Conclusion 11

  12. QUINTA setup and equipment layout during an experiment at F-3 focus (December 2011) Sc telescope 3320 Platform (turned by 2°relatively to the beam axis) Profilometer QUINTA Activation foil Ionization chamber 20° 160° 90° 2 detectors Demon (NE213) Beam extraction 2 detectors Demon (NE213) Polyethylene shielding 2 detectors Demon (NE213) ISOMER detectorНе3 • Activation detectors • Solid State Track detectors • NE213, Stilben neutron detectors • He-3 neutron detectors • Setup • E+T setup • Kvinta setup • Irradiations • Method • Results • Beam monitors • Conclusion 12

  13. Main Objectives of the Kvinta Setup • To have another set-up for benchmark studies of neutron production and transport simulation codes (e.g. MCNPX code) • To have systematic of deuteron beams with energies above 1 GeV • To obtain strong source of neutrons for transmutation tests • Measurement of neutrons and delayed neutrons during low intensity beam irradiation by scintillation detectors • Measurement of neutron field during high intensity beam irradiation by threshold activation and solid state track detectors • Measurement of fission yields in thorium and natural uranium samples in fast neutron spectra • Setup • E+T setup • Kvinta setup • Irradiations • Method • Results • Beam monitors • Conclusion 13

  14. Comparison of E+T and Kvinta Setup E + T setup model Kvinta 2011 setup model • Setup • Method • Setup model • MCNPX simulation • Results • Beam monitors • Conclusion 30 U rods 54 U rods 61 U rods

  15. Kvinta Setup with Lead Shielding Kvinta 2012 setup model • Setup • Method • Setup model • MCNPX simulation • Results • Beam monitors • Conclusion front view 54 U rods 61 U rods side view top view 15

  16. MCNPX simulations • Setup • Method • Setup model • MCNPX simulation • Results • Beam monitors • Conclusion • Used version MCNPX 2.7a • Used Los Alamos la150n neutron and la150h proton libraries • All available physics models in the code tested • Most preferred combination of models for spectra calculation –INCL-ABLA+FLUKA (time-consuming computation but provides the most reliable results)

  17. Beam Monitoring • deuteron beam with energies of 1, 2, 4, 6 and 8 GeV • common measurement of beam intensity using ionization chambers • aluminium and copper foils + SSNTD for beam monitoring • aluminium foil – integral number of deuterons determination, placed several meters away from the set-up • copper foil – deuteron cross-section measurement, placed together with the aluminium foil • copper foil cut into pieces – beam position and profiledetermination, placed directly on the beginning of the target • copper foil – beam alignment with the target axis, placed on the back of the target (2, 4, 6 GeV experiments without Pb shielding) Setup Method Results Beam monitors Conclusion

  18. Beam Monitors Self-absorption correction Beam instability correction Square-emitter correction Decay during cooling and measurement Peak area g line –intensity per decay Detector efficiency Correction for geometry change Correction for Coincidences Dead time correction Decay during irradiation Beam integral determination by Al foil Setup Method Results Beam monitors Conclusion λ – decay constant, tirr – irradiation time, treal – real measurement time, tlive – live time of the detector, t0 – cooling time. 18

  19. Beam Monitors Setup Method Results Beam monitors Conclusion Nyield – total amount of produced 24Na nuclei, A – molar weight, σ - cross-section, m – weight of the foil, S – area of the foil, NA – Avogadro’s number. 19

  20. Beam Monitors Setup Method Results Beam monitors Conclusion Cu foil cut into 16 pieces 2x2 cm 4 most active foils cut again into 16 pieces 1x1 cm example of beam position and shape determination (6 GeV exp) results from SSNTD (A. Potapenko) results from activation foils (Řež group) 20

  21. Kvintaneutron fluxes • Setup • Method • Results • neutron flux • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Kvinta setup with Pb shielding simulated neutron flux in Al foils

  22. Kvintaneutron fluxes • Setup • Method • Results • neutron flux • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Kvinta setup with Pb shielding simulated neutron flux in Al foils

  23. Kvintaneutron fluxes • Setup • Method • Results • neutron flux • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Different types of Kvinta setups simulated neutron flux in Al foils

  24. Kvintaneutron spectra Kvinta setup with Pb shielding simulated neutron spectra in Al foil • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Convolution of cross-sections calculated by TALYS+MCNPX with spectral fluences calculated by MCNPX for neutrons, protons, deuterons and pions

  25. Kvintaneutron distribution • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Kvinta setup with Pb shielding longitudinal neutron distribution Experiment 4 GeV December 2011 Kvinta setup with Pb shielding radial neutron distribution Experiment 4 GeV December 2011

  26. Kvintaneutron distribution • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Kvinta setup with Pb shielding longitudinal neutron distribution Experiment 4 GeV December 2011

  27. Kvintaneutron distribution • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Kvinta setup with Pb shielding radial neutron distribution Experiment 4 GeV December 2011

  28. Kvintaneutron distribution • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Kvinta setup with Pb shielding longitudinal neutron distribution Experiment 1 GeV March 2012

  29. Kvintaneutron distribution • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Kvinta setup with Pb shielding radial neutron distribution Experiment 1 GeV March 2012

  30. Kvintaneutron distribution • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Kvinta setup with Pb shielding longitudinal neutron distribution Experiment 4 GeV March 2012

  31. Kvintaneutron distribution • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Kvinta setup with Pb shielding radial neutron distribution Experiment 4 GeV March 2012

  32. Simulated multiplicity – various models Kvinta 5 sections setup neutron multiplicity • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Kvinta 5 sections setup with Pb shielding neutron multiplicity

  33. Simulated multiplicity – various models Kvinta 5 sections setup neutron multiplicity per GeV • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Kvinta 5 sections setup with Pb shielding neutron multiplicity per GeV

  34. Simulated multiplicity – various models Comparison of Kvinta 5 sections setup with and without Pb shielding neutron multiplicity • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Comparison of Kvinta 5 sections setup with and without Pb shielding neutron multiplicity per GeV

  35. Neutron multiplicityfrom various models • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion

  36. Neutron multiplicityfrom various models • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion 36

  37. Simulated multiplicity – various models Comparison of models in combination with FLUKA or LAQGSM - neutron multiplicity • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Comparison of models in combination with FLUKA or LAQGSM - neutron multiplicity/GeV

  38. Simulated multiplicity – various models Comparison of models in combination with FLUKA or LAQGSM above 1 GeV - neutron multiplicity • Setup • Method • Results • neutron spectra • neutron distribution • MCNPX models • Multiplicity in various models • Beam monitors • Conclusion Comparison of models in combination with FLUKA or LAQGSM above 1 GeV - neutron multiplicity/GeV

  39. Conclusion Setup Method Results Beam monitors Conclusion • made detailed model of the new Kvinta setup consisting of uranium target and blanket • calculated neutron multiplicity of several modifications of the new Kvinta setup • performed beam integral, position, shape and alignment monitoring using aluminium and copper foils • beam characteristics used as input parameters for simulations • simulated neutron fluxes and spectra in diverse positions in the new Kvinta setup and obtained experiment/simulation yield ratios • studied dependency on various physics models included in MCNPX 39

  40. Thank you for your attention

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