Major Description
An FCC related requirement
Most detectors will feature very high granularity:
• Interest in having 64 bits for VolumeID (DD4hep “cellID” is 64 bits)
Contacts: Francois Brieuc, Alvaro Tolosa Delgado,Gerardo Ganis
See p7 of Marilena's talk: https://indico.cern.ch/event/1455551/contributions/6139451/attachments/2941438/5167964/20241007_OpenAndNewRequirementsHeP_MBandieramonte.pdf