Abstract
Consistent detector description is an integral part of all modern experiments and also the main motivation behind the creation of DD4hep, which tries to address detector description in a broad sense including for, example, geometry and the materials used in the device, additional parameters describing e.g. the detection techniques, constants required for alignment and calibration, description of the readout structures and conditions data. A central component of DD4hep is DDG4 which is a mechanism that converts arbitrary DD4hep detector geometries to Geant4 and provides access to all Geant4 action stages. In addition to that DDG4 also offers a comprehensive plugins suite that includes handling of different IO formats, Monte Carlo truth linking and a large set of segmentation and sensitive detector classes, allowing the simulation of a wide variety of detector technologies. One of the last remaining open issues of detector description was support for drawings from civil engineers for passive detector components. In this proceedings we highlight recent developments in DD4hep/DDG4 that enable support for CAD drawings and generic tessellated shapes and through the help of the library assimp enable the import of a wide variety of CAD formats, thus eliminating the need for writing complex re-implementations of CAD drawings in source code. In addition, we present other developments such as support for a new output format called EDM4hep and developments for a more unified and easier handling of units.
Highlights
The DD4hep software toolkit [1] targets the unification of detector description at all stages of the experimental lifecycle
The aim is to deliver on one side the geometrical and material properties, and on the other side provide parameters such as alignment constants and calibration, description of the readout structures and conditions, and those directly associated with detection techniques
The support to create real parts of the detector geometry directly from design files provided by engineering departments using Computer Aided Design (CAD) tools was demanded by physicists for a long time
Summary
The DD4hep software toolkit [1] targets the unification of detector description at all stages of the experimental lifecycle. The objective is to extract consistent information from a single source and deliver it to simulation, reconstruction and analysis steps in data processing. The advantages of such a consistent, comprehensive description are clearly established from experience in high energy physics experiments. The working principles of DD4hep [6] and details about simulation [7] have been summarized at previous conferences [8]. The aim of these proceedings is to present Tessellated Shapes and CAD support as well as highlight the most relevant changes that occurred since release DD4hep v01-11, the current realease is v01-16
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