Company background presentation

Neutron Optics & Shielding group

Nataliia Cherkashyna

TAP meeting23rd of January, 2014

Latest Developments on Shielding and Backgrounds

1Projects & Plans

Shielding at ESS

Background issues: SNS, J-PARC, ISIS

Particle showers: electromagnetic vs. hadronic

The reason of that problem are the particle showers. That are the cascades of secondary particles, created by high-energy particles interacting with dense matterThere are 2 tyoes of showers:1 .. Localized2 .. More spread5Particle shower: electromagnetic & hadronicHadronicElectromagneticphotons, electrons, positrons

Fundamental interactions involved:electromagnetismnucleons & other quark-composite particles

Fundamental interactions involved:strong nuclearForcesTypically includes - -CLICK6Particle shower==Neutron:Proton:Quarks:Gluons:udPhoton:Charged particles:GEANT4106 neutrons 2.5 GeVSize: 2m x 2m x ZZ:from 0.1m to 3m

General idea

From minimizing high-energy flux to stopping it. There were some simulations done to investigate shielding properties of different materials. and here is the main idea.. .. .. .. .. Ideal detector. Development of shower in block of iron8Collaboration

9Shielding materials

IronSteelCopper10Shielding materials

AluminumTungstenConcrete11Iron, copper and steel

CopperSteelIron122m Fe + 0.7m Cu + 0.3m W

Z1 = 3m Fe + 1m Cu + 0.4m WZ2 = 2.5m Fe + 0.7m Cu + 0.3m WZ3 = 2m Fe + 0.7m Cu + 0.3m WZ4 = 2m C + 0.7m Cu + 0.3m WZ5 = 1m Fe + 2m ConcreteCombinations of different materialsWhats next? Optimization algorithm coming soonTaking into account, that different materials can be attractive for possible shielding solutions, the combinations of different materials were invstigated14PSI (SINQ)

SINQ

Measurements at PSI (SINQ)

GEANT4 simulationsBandsModeling of a symmetric problem

Energy cutsMore details in geometryRunning to improve the statistics

to be continued by Douglas Di JulioNot the end!