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FLUKA radioprotection calculations

FLUKA radioprotection calculations. Maria – Ana Popovici Politehnica University of Bucharest. Dose Legal Limits in Romania. NSR-01 Monitorul Oficial al Romaniei Partea I nr. 404 bis /29.08.2000 Fundamental Norms for Radiological Safety. Overview.

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FLUKA radioprotection calculations

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  1. FLUKA radioprotection calculations Maria – Ana Popovici Politehnica University of Bucharest

  2. Dose Legal Limits in Romania NSR-01 Monitorul Oficial al Romaniei Partea I nr. 404 bis /29.08.2000 Fundamental Norms for Radiological Safety

  3. Overview • FLUKA simulations of ELI-NP facility “hot spots” (from a radioprotection point of view) were performed for: • Gamma Source a) 600 MeV electron beam dump b) 19.5 MeV gamma beam dump (E7, E8 in the general layout) • 10 PW Laser (E1)

  4. ELI-NP Facility Layout

  5. FLUKA Settings – Defaults Precisio • EMF on • Rayleigh scattering and inelastic form factor corrections to Compton scattering activated • Detailed photoelectric edge treatment and fluorescence photons activated • Low energy neutron transport on down to thermal energies included, (high energy neutron threshold at 20 MeV) • Fully analogue absorption for low-energy neutrons • Particle transport threshold set at 100 keV • Multiple scattering threshold at minimum allowed energy, for both primary and secondary charged particles

  6. FLUKA Settings • Delta ray production on with threshold 100 keV • Heavy particle e+/e- pair production activated with full explicit production (with the minimum threshold = 2m_e) • Heavy particle bremsstrahlung activated with explicit photon production above 300 keV • Muon photonuclear interactions activated with explicit generation of secondaries • Heavy fragment transport activated

  7. Materials (FLUKA input) • Normal concrete (walls) • Normal concrete, used at ELBE(FZD); density 2.6 g/cm3 • Composition (mass fraction): HYDROGEN - 0.007; OXYGEN - 0.456; SILICON - 0.225; SODIUM - 0.014; MAGNESIU - 0.028; ALUMINUM - 0.055; IRON - 0.058; POTASSIU - 0.005; CALCIUM - 0.106; TITANIUM - 0.005; FLUORINE - 0.0026; SULFUR - 0.0015; PHOSPHO - 0.0004; CHLORINE - 0.0001 • Heavy concrete (beamdumps) • MPQ Concrete; densiy 3.295 g/cm3 • Composition (mass fraction): HYDROGEN – 0.01048482; BORON - 0.00943758 CARBON – 0.0129742; OXYGEN – 0.27953541; FLUORINE – 1.5175E-4; SODIUM - 3.7014E-4 ; MAGNESIU – 0.08298213; ALUMINUM – 0.02769028; SILICON – 0.06317253; PHOSPHO – 0.00176963; SULFUR – 5.8275E-4; POTASSIUM – 4.2024E-4; CALCIUM – 0.03227609; TITANIUM - 5.457E-5; MANGANES – 0.00321757; IRON – 0.47423935; STRONTIU - 6.4097E-4

  8. Materials (FLUKA input) • Stainless steel (electron pipeline, laser beamdump – as an alternative) AISI316LN; density 7.8 g/cm3 • Composition (mass fraction): IRON – 0.67145; CHROMIUM - 0.185; NICKEL - 0.1125; MANGANES - 0.02; SILICON - 0.01; PHOSPHO - 4.5E-4; SULFUR - 3.E-4; CARBON - 3.E-4 • Borated polyethylene (beamdump); density 0.94761 g/cm3 • Composition (mass fraction): CARBON – 0.61192; HYDROGEN – 0.1153; OXYGEN – 0.22261; BORON-11 – 0.04107; BORON-10 – 0.0091 • Wet air (air with moisture); density 0.00129 g/cm3 • Composition (mass fraction): NITROGEN - 0.74379; OXYGEN - 0.24169; CARBON - 0.00012; ARGON - 0. 01263; HYDROGEN - 0.00177

  9. Source terms (FLUKA input) Gamma Source ( ELI-NP White Book) a) Electrons: 600 MeV electron beam, 250 pC/pulse, 12kHz, Div = 0.1 mrad, Gaussian, FWHM = 6 MeV b) Photons: 19.5 MeV gamma beam, 8.0E+08 g/pulse, Div = 0.1 mrad, Gaussian, FWHM = 0.0195 MeV

  10. Source terms (FLUKA input) • 10 PW Laser (I = 1.0E+22) - (ELI-PP White Book - draft) - 0.1 Hz, 300 J pulse-1 • a) Photons • 3 thermal components with CUTOFF energy at 4 MeV, isotropic • T1 = 0.035 MeV, N1 = 1.1E+14 sr-1 pulse-1 • T2 = 0.58 MeV, N2 = 1.0E+14 sr-1 pulse-1 • T3 = 8.8 MeV, N3 = 9.0E+11 sr-1 pulse-1 • b) Electrons • 38 GeV Gaussian beam, FWHM = 1MeV, CUTOFF energy at 38 GeV, N = 9.0E+13 sr-1 pulse-1, Div = 1o

  11. Source terms (FLUKA input) c1) Protons 1 thermal component with CUTOFF energy at 2 GeV, isotropic T = 20 MeV, N = 1.0E+07 sr-1 pulse-1 c2) Protons uniform energy distribution between 0 and 2 GeV, isotropic T = 20 MeV, N = 1.0E+07 sr-1 MeV-1 pulse-1 10 PW Laser (I = 1.0E+23) – ELI-PP estimations concerning only protons First estimation 1 thermal component with CUTOFF at 100 MeV, Div = 40o T = 20 MeV, N = 5.0E+13 sr-1 pulse-1 Second estimation uniform energy distribution between 0 and 100 MeV, Div = 40o N = 5.0E+13 sr-1 MeV-1 pulse-1

  12. Gamma SourceElectron Beamdump - Geometry • Cave dimensions: 19m x 5m x 11m • Lateral walls, roof, floor – thickness = 1m Exception: lateral wall for beamline admitance 1.5 m • Beamline: diameter = 2cm, 2mm thick, in AISI316LN, 1mm thick Al cap

  13. Gamma SourceElectron Beamdump - Geometry • Beamdump: 6m x 4.5m x 8m in MPQ concrete (Martin Gross design) • Beamdump core: graphite (cone, diameter = 10cm, height = 50cm), Al (cylinder, diameter = 10cm, height = 30cm)

  14. Gamma SourceElectron Beamdump – FLUKA Simulation

  15. Gamma SourceElectron Beamdump – FLUKA Simulation

  16. Gamma SourceGamma cave + Beamdump Geometry • Cave E7: 8m x 5m x 8m • Cave E8: 8m x 5m x 5m • Walls – 1.5 m thick • Wall opposite to the admitance of the beamline is 2m thick

  17. Gamma SourceGamma cave + Beamdump Geometry • Beamdump dimensions: 3m x 3m x 4m • Beamdump in normal concrete • Central hole in beamdump: 30 cm diameter, 1m length • Beamline in stainless steel, diameter 2 cm, 2 mm thick walls, 1 mm thick exit cap in Al.

  18. Gamma SourceGamma cave – FLUKA Simulation

  19. 10 PW LaserLaser Cave & Reaction Chamber Geometry • Cave dimensions: 5m x 5m x 10m • Lateral walls, roof, floor – thickness = 1.5 m • Reaction chamber dimensions 1.3m x 1.5m x 2.85m • Wall thickness – 6 cm • Pipe: diameter = 40 cm, 2cm thick, 2 m length in Al, 2mm thick Al cap

  20. 10 PW LaserFirst Beamdump Geometry & Materials • 3m x 3m x 7.5m MPQconcrete BD • 50 cm Bor_Poly inside cave • Lead core 1.3m x 1.3m x 3m • Central hole: 2m long cylinder (diameter = 15cm) + 50 cm height cone

  21. 10 PW LaserSecond Beamdump Geometry & Materials • 3m x 3m x 7.5m AISI316LN stainless steel BD • 1m Bor_Poly inside cave • 1m Bor_Poly outside the external region of BD • Graphite core 1m long cylinder (diameter = 20cm) + 50 cm height cone • Central hole: 1m long cylinder (diameter = 20cm)

  22. 10 PW LaserElectrons – FLUKA Simulation

  23. 10 PW LaserElectrons – FLUKA Simulation

  24. 10 PW LaserElectrons – FLUKA Simulation

  25. 10 PW LaserElectrons – FLUKA Simulation

  26. 10 PW LaserPhotons – FLUKA Simulation

  27. 10 PW LaserPhotons – FLUKA Simulation

  28. 10 PW LaserPhotons – FLUKA Simulation

  29. 10 PW LaserPhotons – FLUKA Simulation

  30. 10 PW LaserProtons – FLUKA Simulation

  31. 10 PW Laser - 1.0E+22 W cm-2 • Protons • 1 thermal component with CUTOFF energy at 2 GeV, isotropic • T = 20 MeV, N = 1.0E+07 sr-1 pulse-1 • Protons • uniform energy distribution between 0 and 2 GeV, isotropic • N = 1.0E+07 sr-1 MeV-1 pulse-1

  32. 10 PW Laser - 1.0E+22 W cm-2Protons (thermal) – FLUKA Simulation

  33. 10 PW Laser - 1.0E+22 W cm-2Protons (uniform) – FLUKA Simulation

  34. 10 PW Laser - 1.0E+22 W cm-2Protons (uniform) – FLUKA Simulation

  35. 10 PW Laser - 1.0E+22 W cm-2Protons (uniform) – FLUKA Simulation

  36. 10 PW Laser - 1.0E+22 W cm-2Protons (uniform) – FLUKA Simulation

  37. 10 PW Laser - 1.0E+22 W cm-2Protons (uniform) – FLUKA Simulation

  38. 10 PW Laser - 1.0E+22 W cm-2 Protons (uniform) – FLUKA Simulation

  39. 10 PW Laser - 1.0E+23 W cm-2Protons (thermal) – FLUKA Simulation

  40. 10 PW Laser - 1.0E+23 W cm-2ELI-PP estimations concerning only protons • 1 thermal component with CUTOFF at 100 MeV, Div = 40o, T = 20 MeV, N = 5.0E+13 sr-1 pulse-1, • uniform energy distribution between 0 and 100 MeV, Div = 40o, N = 5.0E+13 sr-1 MeV-1 pulse-1

  41. 10 PW Laser - 1.0E+23 W cm-2Protons (uniform) – FLUKA Simulation

  42. 10 PW Laser - 1.0E+23 W cm-2Protons (uniform) – FLUKA Simulation

  43. 10 PW Laser - 1.0E+23 W cm-2Protons (uniform) – FLUKA Simulation

  44. Conclusions • All the radiation sources at the ELI-NP facility are shieldable in the present simplified layout, even in an uninterrupted 0.1 Hz working regime. • An important exception: protons with a rectangular energy distribution. If this source term definition will prove to be valid, then a limitation of the number of shots per day will become necessary. • In order to avoid such unwanted limitations, more realistic source definitions would be very helpful.

  45. Conclusions • The present calculations are schematic and changes in these results are naturally expected once building and experimental setup details are taken into account. • Shielding calculations with FLUKA transport code can and need to be refined, but this requires the cooperation of members of the experimental groups, who need to provide detailed description of their setups. Also, the problem of the source term definition should find a realistic solution for each type of experiment which is to be performed.

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