ALFA GeoModel implementation and simulation status

ATHENA, what is our job? ALFA GeoModel implementation MC simulation – first steps Problems Summary

Vít Vorobel ALFA meeting CERN 24.5.2006

Vít Vorobel ALFA meeting CERN 24.5.2006 2

ATHENA network DATA

Materials Geometry (GeoModel)

o Tile Calo SCTo ALFA we have to provide to ATLASo …

Settings … …

TOOLS Simulation (GEANT) we may use for ALFA Analysis (Root)

Vít Vorobel ALFA meeting CERN 24.5.2006 3

23.17

135

160

173

270

ALFA

Si-1

PS

Si-2Si-3

GeoModel - Geometry & materials

• Si-1,2,3 – Si, = 2.3g/cm3, 0.3x100x100mm• PS – Polystyrene (C8H8)n , =1.05g/cm3 ,8x16x12mm• Air – 20%O2, 80%N2, = 1.29mg/cm3

ALFA detector • Ceramics – Al2O3 , =3.7g/cm3 , 0.17x16x12mm• Plastic layers – material as PS, 0.5x16x12mm, logically

divided to– Sensitive cores of fibers □0.48 mm– Insensitive everything else simulating cladding, glue,

and spacers– Fibers positioned regulary with x and pinch from

metrology data, slope=45°– Fibers are not cutted on the edge.

Vít Vorobel ALFA meeting CERN 24.5.2006 4

MC simulation A testing volume built and a particle shouted from IP to the volume Deposited energy evaluated end histogrammed

Vít Vorobel ALFA meeting CERN 24.5.2006 5

Problems

All components of the ATHENA framework are under development New versions of the components are released independently – are not compatible E.g. version…&version… histograms are not built V….&v…. histohrams are built but not visible V….&v…. segmentation fault . . Users (we) never know if the user code is wrong or the used components are not

compatible

Conclusion Achievements

GeoModel – The present code includes The ALFA and Overlap detectors with ideal fiber staggering The detectors are “cloned” to all stations

MC Simulation – we are able to shout a particle into a testing volume To read and histogram the energy deposition in the testing volume

Tasks to do Add Roman Pots to GeoModel Learn how to read a real geometry from the database Learn how to modify idealreal geometry in GeoModel Ask an administrator to add our code to ATHENA framework Extend MC simulation from a testing volume to ALFA detector