Geometry of the Showerdetector in Geant

by Ilse Koenig, April 8, 1998
The geometry was implemented by Jacek Otwinowski from Krakow





Fig 1: Drawing of the Showerdetector.





Fig 2: Geometry tree of the Showerdetector in Geant





Fig 2: Cut through Showerdetector at the upper edge and at x=0. The y-axis points upward and the z-axis to the right.



The keepin volume SHKx (filled with AIR$) in each sector contains three modules: SH1M (Preshower), SH2M and SH3M (Postshower). SH1M and SH2M contain a Lead converter SxPB.




Fig 2: Geometry tree of the Preshower in Geant





Fig 2: Cut through the Preshower at the upper edge and at x=0. The y-axis points upward and the z-axis to the right.



The volume S1AO contains the active volume S1AI (filled with DRIFTGAS_SHOWER$) with the padplane S1SW (filled with TU_CU_BE_WIRES$) in the middle.
The frames S1FB and S1FB (filled with ALUMINIUM$) contain an inner volume S1IB and S1IT (filled with AIR$) with the 7-fold support structure made from ALUMINIUM$.
These inner volume are visible only in Fig. 2.