First “Skin Depth” estimations using GEANT4 and FLUKA based simulations for CERN secondary beamlines

In order to have highly flexible secondary beamlines collimation is crucial. Collimators are blocks of material placed along the beamline that let main beam pass within collimator aperture limits, while most particles beyond it interact in and gets absorbed or loses enough energy be deflected away from core by magnets downstream. Some can at edge collimators accepted beam, creating background for experiments The thickness layer contributing this potential called Skin Depth. It depends on collimator, momentum as well acceptance terms band divergence. This article presents first studies with GEANT4 FLUKA based simulations effects such interactions CERN beamlines.