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 Physical 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
Geometry
Geometry Attributes
Material 1
DetectorElement
LogicalVolume
0..n
m_material
m_geometry : PhysicalVolume 1
m_solid : Solid
m_pparvol
m_material : Material 1
m_dir : PhysicalVolume
1..n 1
m_solid 1
m_geometry n
Solid 1
m_pvol n
PhysicalVolume
m_volume : std::string = ""
m_parentvol : std:;string = ""
m_replica : u_int = 0
m_dir
m_pvol : LogicalVolume
0..n
m_pparvol : LogicalVolume
Tube
Sphere
Box
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 detector specific 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