WP#01/2020-2021 – Improvement of Passive Material Description of ATLAS Detector for Simulation

Collaborative partners:   University of Edinburg

There are several regions of the geometry used in the Geant4 simulation where volumes representing service and support structures are missing or described by insufficient detail. Moreover, volumes representing structures that will undergo modifications during the Phase-I upgrades will be changed, in particular the NSW. The work to be carried out as part of this working package is the implementation of these missing volumes and the refinement of volumes with insufficient detail.

The main objective is to establish a smooth workflow from design engineers to the implementation within the ATLAS ATHENA framework. The design geometry will be extracted from the engineering database and implemented in CATIA by adding absent drawings. Subsequently the derived 3D model will be simplified, paying special attention to preserving the initial volume and weight. A transfer into XML will be performed. The result will then be integrated into the simulation geometry with assistance from geometry and simulation experts. All detector systems will be considered in these studies, starting with the Muon Spectrometer, including the NSW, and extending to the calorimeter (and subject to further discussion the inner detector).

General list of volumes to be done:

1. ID services in sectors 3, 1 and 7 — Muon subsystem
2. Magnet services in sector 13 and 7 — Muon subsystem
3. Lar services in GAP region — Calo subsystem
4. Cables, Pipes and support structures in GAP region — Calo subsystem
5. Electrical boxes in GAP region — Calo subsystem
6. CALO services — Calo subsystem
7. Muon services — Muon subsystem
8. Racks, Cable trays — Muon subsystem
9. Platforms in sectors: 1, 3, 5, 7, 9, 11, 13, 15 — Muon subsystem

ATLAS Project(s): Muon Spectrometer and Tile Calorimeter

ATLAS contact person: Stefano Rosati and Nicolas Koehler (Muon Spectrometer); Alexander Solodkov (Tile Calorimeter)
Required effort from Georgian team: 2 FTE /CATIA designers, programmers
Georgian team contact person: 0.4 FTE
Required visits to CERN by Georgian team: 3 visits of 1-2 weeks Deliverables:
1.     Technical reports of Simplification
2.     Technical reports of Integration Conflicts Checking
3.     XML code
4.     Implementation in the simulation geometry