Speaker
O. Link
(CERN, PH/SFT)
Description
Twisted trapezoids are important compontents in the LAr end cap calorimeter of the
Atlas detector. A similar solid, the so-called twisted tubs consists of two end
planes, inner and outer hyperboloidal surfaces, and twisted surfaces, and is an
indispensable component for cylindrical drift chambers (see K. Hoshina et al,
Computer Physics Communications 153 (2003) 373-391). In Geant3 exists a general
version of a twisted trapezoid, however the implementation puts very strong
restrictions on its use.
In the Geant4 toolkit no solids have been available to date to describe twisted
objects. The design and realisation of new twisted solids within the framework of
Geant4 will be presented together with the algorithmic details, followed by a
discussion of the performance and accuracy test results.
Primary author
O. Link
(CERN, PH/SFT)
