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Activation studies on benefit of the selection of the ESS target concept

Activation studies on benefit of the selection of the ESS target concept. D. Ene. M. P. W. Chin. C. Kharoua. E. Noah. F. Plewinski ESSS-AB. Stora Algatan 4. Lund. Sweden. ESS in Lund. Goal. Development of a method to be used for residual field estimation for target

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Activation studies on benefit of the selection of the ESS target concept

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  1. Activation studies on benefit of the selection of the ESS target concept D. Ene. M. P. W. Chin. C. Kharoua. E. Noah. F. Plewinski ESSS-AB. Stora Algatan 4. Lund. Sweden

  2. ESS in Lund SATIF 2010 CERN, Geneva 2-4 of June 2010

  3. Goal • Development of a method to be used for residual field estimation for target • and its surroundings. • Selection of the appropriate approach for the optimized model estimates. • Rough estimates for order of magnitude evaluations. • Global amounts are analyzed. • -Investigation of the influence of various parameters: • -proton beam energy; • -target material; • -complexity of the geometry model. • irradiation history, beam profile. etc SATIF 2010 CERN, Geneva 2-4 of June 2010

  4. Neutron flux in ith cell ⇨The neutron flux is assumed to be constant over the irradiation period and not being modified by the irradiated medium RESIDUAL RADIATION: Method Geometry and materials description PHITS/ MCNPX Residues in ith cell Irradiation Scheme- DCHAIN-SP-2001/ CINDER 40 y irradiation @5000h Activation products & Photon sources MCNPX H*(10) SATIF 2010 CERN, Geneva 2-4 of June 2010

  5. Input data Moderators: L-H2 R=16cm. H=20cm Proton beam: Gauss :2sx = 10 cm 2sy =3 cm E= 2.5GeV | ( 1-4) GeV Target materials: Hg. PbBi. PbAu. W (Ta claded) Target vessel: SS316 Moderator clad: Al Beam window: AlMg3 Irradiation history: 38 y 5 MW @ 5000h 5000 h 5MW 3678 h 0 5000 h 5 MW Normalization : 5 MW Preliminary results SATIF 2010 CERN, Geneva 2-4 of June 2010

  6. Proton beam energy Hg target neutrons protons SATIF 2010 CERN, Geneva 2-4 of June 2010

  7. Proton beam energy Hg_target SS vessel daniela.ene@ess.se SATIF 2010 CERN, Geneva 2-4 of June 2010 7

  8. Details in modeling Hg target Reflector configuration Hg target daniela.ene@ess.se SATIF 2010 CERN, Geneva 2-4 of June 2010 8

  9. Details in modeling Al clad SS vessel SS vessel 51Cr, 55Fe, 3H,54Mn 3H, 51Cr, 55Fe,63Ni, 60Co 59Ni, 14C, 93Mo,91Nb Al clad 28Al 3H 26Al, 14C SATIF 2010 CERN, Geneva 2-4 of June 2010

  10. Details in modeling stars Hg target Hg target daniela.ene@ess.se SATIF 2010 CERN, Geneva 2-4 of June 2010 10

  11. Target material T#1 T#1 198Au. 187Ws (n.g) (JEF2.2) ? T#1 194Hg-194Au 208Bi 202Pb 163Ho. 191Nb. 93Mo daniela.ene@ess.se SATIF 2010 CERN, Geneva 2-4 of June 2010 11

  12. Target material Hg PbBi W PbAu daniela.ene@ess.se SATIF 2010 CERN, Geneva 2-4 of June 2010 12

  13. Target material Activation | TOP 10 @ 1 y daniela.ene@ess.se SATIF 2010 CERN, Geneva 2-4 of June 2010 13

  14. Comparison of tools Hg target daniela.ene@ess.se SATIF 2010 CERN, Geneva 2-4 of June 2010 14

  15. Detailed results Beam window #2 SATIF 2010 CERN, Geneva 2-4 of June 2010

  16. Conclusions • Changing the proton beam energy while maintaining the same beam power does not change substantially the total radioactivity in the target material • Induced radioactivity and decay heat depend on the target material. Large differences occur mainly for those materials where the thermal neutron activation is the dominant factor. • Contribution of moderators and reflector has to be accounted since the early design phase. • Analysis of the differences obtained by using various tools to be continued. daniela.ene@ess.se SATIF 2010 CERN, Geneva 2-4 of June 2010 16

  17. Backup daniela.ene@ess.se SATIF 2010 CERN, Geneva 2-4 of June 2010 17

  18. Details in modeling Hg target H*(10) [mSv h-1] daniela.ene@ess.se SATIF 2010 CERN, Geneva 2-4 of June 2010 18

  19. Backup daniela.ene@ess.se SATIF 2010 CERN, Geneva 2-4 of June 2010 19

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