Let's setup new detector in FCCSW

Juraj Smieško

CERN

Kick-Off Workshop on Detector Optimisation and Benchmarking for FCC-ee

23 June 2022

FCCSW

• Set of software packages, tools, and standards to help different FCC studies work together
• Based on Key4HEP
  • Common software for FCC, CLIC/ILC and CEPC
• Key features:
  • Data processing framework: Gaudi
  • Event data model: EDM4hep
  • Detector description: DD4hep
  • Software distribution: Spack

Typical HEP Software stack source: Graeme A Stewart

Workflow

• Mostly Key4HEP algorithms combined into several stages
• Data exchange governed by EDM4hep
• Analysis framework: FCCAnalyses
  • RDataFrame based
  • Can read EDM4hep files
• Stack is hosted on CVMFS
• Much more detail: FCC Tutorials

Detector description

• The detector geometry is described with help of DD4hep
• The detector is described in series (tree) of XML files
• XML Schema defined by LCSim
• To instantiate the detector in the memory functions need to be created
• All FCC detectors implemented so far are collected in FCCDetectors repository
• CLIC/ILC detectors are implemented in lcgeo

Detector description

Detector description

Detector Visualization

geoDisplay: LAr based detector

Detector Visualization

Phoenix: DD4hep compact file converted to glTF

WIP: Event data conversion

Simulation

• One can use combination of k4Gen + K4SimGeant4
• k4Gen wraps generators and particle guns
• K4SimGeant4 wraps Geant4
• EDM4hep ⟷ HepMC done by Gaudi algorithm
• The whole simulation is steered from Gaudi
• Example: Noble Liquid Calo

Simulation

• Other possibility is to use ddsim
• Splits the workflow
• Used by CLD
• EDM4hep allows to crosscheck the two approaches
  
  Determination of LAr upstream correction using DDSim

Conclusions

• FCCSW stack is Key4HEP based
• Detectors are described in dd4hep
• We see advantages in having one processing framework
• Work on visualization tools underway
• Come talk to us: Main page, Forum, Tutorials