New magnetic field switch class

Addition of a new class for tailored magnetic field switch-off in ATLAS simulation in order to save CPU power. This switch is operating in the area inside the EM barrel calorimeter region, where the magnetic field is low anyways, and for all particles except of muons.

The modifications include:

1. Addition of a new class SwitchingFieldManager, inheriting from G4FieldManager.
2. Modification of the DetectorFieldManagerTool.cxx to use the alternative G4FieldManager when requested. Here there was a previous attempt to achieve the same effect by the TightMuonElseNoFieldManager and it has been commented out.
3. Modification of the DetectorFieldManagerTool to be able to attach a G4FieldManager to a G4VPhysicalVolume as well, instead of G4LogicalVolume only as it was before.
4. Modification in G4FieldConfig.py to attach the SwitchingFieldManager to the LArBarrel physical volume. Μodifications have not been applied in G4FieldConfigNew.py. (maybe we should?)

The switch can be enabled with the pre-include: simFlags.MuonFieldOnlyInCalo=True;simFlags.MuonFieldOnlyInCalo(). Without this flag the developments should not affect the simulation jobs.

The idea and the development progress is documented in ATLASSIM-4749.

This merge request affects 2 packages:

• Simulation/G4Atlas/G4AtlasServices
• Simulation/G4Atlas/G4AtlasTools

Affected files list will not be printed in this case

Adding @jchapman as watcher

added Simulation master review-pending-level-1 labels

CI Result SUCCESS (hash a7d96a9c)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 35849]

Hi @ekourlit,

I have added a couple of minor comments. Can you please take a look at them?

Also, can you please add the ATLAS robot as developer to your fork as described here?

Thanks, Volker (L1)

added review-user-action-required label and removed review-pending-level-1 label

added 1 commit

• bfc2b786 - update the copyright notice

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This merge request affects 2 packages:

• Simulation/G4Atlas/G4AtlasServices
• Simulation/G4Atlas/G4AtlasTools

Affected files list will not be printed in this case

Adding @jchapman as watcher

added review-pending-level-1 label and removed review-user-action-required label

CI Result SUCCESS (hash bfc2b786)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 35880]

Changing label to review-user-action-required until the discussions are resolved. Please change back when ready. Clara (L1)

added review-user-action-required label and removed review-pending-level-1 label

added 85 commits

• bfc2b786...d4914b40 - 83 commits from branch atlas:master
• ce845b26 - remove cout commented-out lines
• 49a9cb62 - Merge branch 'master' of https://gitlab.cern.ch:8443/atlas/athena

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resolved all threads

removed review-user-action-required label

added review-pending-level-1 review-user-action-required labels

removed review-user-action-required label