CERN

Collaborative partners: CERN Recently unexpected overlaps have been discovered in coil cryostat tube description. They are not presented in XML and Persint and arise later when Athena is running. Reason should be in XML->GeoModel->G4 transformation or in fault of G4 Boolean

Collaborative partners: University of Pittsburgh Considering above stated issues activities as follow are foreseen:

Collaborative partners:   Stanford University;   SLAC Reliable calculation of cavern background depends on the geometry and material descriptions in the application. There are known deficiencies in the present implementation such as in Barrel End Cap gap region, where the current model does not

There are regions where MC/data discrepancy is substantial. Purpose of this work is having answer does discrepancy comes due to the difference between Geant4 vs CATIA geometry or not. If yes then G4 baseline geometry will be accordingly modified. Execution

Collaborative partners:   University of Oxford

Collaborative partners:   Nikhef,   CERN There are regions where MC/data discrepancy is substantial. Purpose of this work is having answer does discrepancy comes due to the difference between Geant4 vs CATIA geometry or not. If yes then G4 baseline geometry will be accordingly

Collaborative partners:   University of Pittsburgh