Difference GEANT3-GEANT4 via VMC: media in magnetic field (CBMROOT) about vmc HOT 3 CLOSED

Hello @kisselan ,

In Geant4 VMC, only some of tracking media parameters are taken into account.
Can you, please, explain the meaning of the tracking media parameters that you put on your slides, such as

// ----- Vacuum ----------------------------------------------------------
Vacuum  1 1.e-16 1.e-16 1.e-16
        0 1 20. .001
        0

They seem to be FairRoot specific.

Thank you,

from vmc.

The all explanations you can find here: https://fairroot.gsi.de/index.html%3Fq=node%252F34.html

from vmc.

Hello @kisselan ,

Sorry for a delay; I confirm that the four parameters for field defined for a tracking medium: sensflag, fldflag, fld and epsil are not taken into account by Geant4 by default. It is possible to choose to take into account the sensflag with

/mcDet/setIsZeroMagField true 

There are also commands available for customisation of parameters for field propagation described in Geant4 VMC documentation:

https://vmc-project.github.io/user-guide/geant4_vmc/magnetic-field/

Best regards,

from vmc.