1. NEUTRON OPTICS & SHIELDING GROUP NATALIIA CHERKASHYNA TAP MEETING 23 RD OF JANUARY, 2014 Latest Developments on Shielding and Backgrounds

2. Projects & Plans

3. Shielding at ESS

4. Background issues: SNS, J-PARC, ISIS

5. Particle showers: electromagnetic vs. hadronic

6. Particle shower: electromagnetic & hadronic Hadronic Electromagnetic photons, electrons, positrons Fundamental interactions involved: electromagnetism  nucleons & other quark-composite particles  Fundamental interactions involved: strong nuclear

7. Particle shower = = Neutron: Proton: Quarks: Gluons: u d Photon: Charged particles:

8. GEANT4 10 6 neutrons  2.5 GeV Size: 2m x 2m x Z Z: from 0.1m to 3m General idea

9. Collaboration

10. Shielding materials IronSteelCopper

11. Shielding materials AluminumTungstenConcrete

12. Iron, copper and steel Copper Steel Iron

13. 2m Fe + 0.7m Cu + 0.3m W

14. Z 1 = 3m Fe + 1m Cu + 0.4m W Z 2 = 2.5m Fe + 0.7m Cu + 0.3m W Z 3 = 2m Fe + 0.7m Cu + 0.3m W Z 4 = 2m C + 0.7m Cu + 0.3m W Z 5 = 1m Fe + 2m Concrete Combinations of different materials What’s next? Optimization algorithm coming soon

15. PSI (SINQ)

16. SINQ

17. Measurements at PSI (SINQ)

18. GEANT4 simulations Bands Modeling of a symmetric problem Energy cuts More details in geometry Running to improve the statistics

19. … TO BE CONTINUED BY DOUGLAS DI JULIO Not the end!