Detector description News

1. Detector description News • Detector description transient model • logical detector description • geometry detector description • Prototype • detector data service • metadata • concrete detector elements

2. Logical detector description • description of a detector which is based on its logical organization, e.g. hierarchical containment • used for navigation through all the hierarchy of detector elements and access to its information • unique identifiers for individual detector elements, e.g. /dd/setup99/muon/station1

3. Geometry detector description • defines structure, hierarchy of volumes and how they are composed of each other • holds information about volumes properties, e.g. shape, dimensions, material • position in space, translation, rotation of the volumes

4. Volumes definitions • Logical volume • represent a leaf node or unpositioned subtree in the geometry hierarchy • may have daughters ascribed to it • responsible for retrieval of the physical attributes of the physical volume that it represents • e.g. shape, material, magnetic field, user limits, sensitive detectors,… • Physical volume • positioned within and relative to a given mother volume • represented by a given logical volume

5. Transient Model Detector Description Geometry Geometry Attributes DataObject Material 1 m_material 0..n DetectorElement LogicalVolume m_geometry : PhysicalVolume m_solid : Solid 1 m_material : Material m_pparvol 1 1..n m_dir : PhysicalVolume 1 1 m_solid m_geometry Solid n 1 m_pvol n PhysicalVolume m_volume : std::string = "" m_parentvol : std:;string = "" m_replica : u_int = 0 m_dir 0..n m_pvol : LogicalVolume m_pparvol : LogicalVolume Tube Box Sphere m_pvol: N replicas of the PhysicalVolume can point to the same LogicalVolume m_pparvol: N PhysicalVolumes can have the same parent m_dir: LogicalVolume may have 0..N daughter PhysicalVolumes

6. Detector Data service • Test prototype done • creates detector elements hierarchy • creates volumes hierarchy • resolves the links from detector elements to geometry • Release prototype being prepared • integration with Gaudi • use of metadata to build transient store structure • additional interface(s) specific to detector data

7. Metadata • Define structure of the detector data in the transient store including both the detector elements and geometry volumes • current implementation uses structured text file with parser • query interface implemented for integration with detector data service(s) • move towards real database technology in the future (Objectivity DB)

8. Detector elements • generic • implemented • defines common interface • provide links to other information • detector specific • inherit from generic • define attributtes and methods specific to a given detector or element • to be designed and implemented • help needed from detector groups