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Question Extrapolating particle by hand 

Forum: Fields: Magnetic and Otherwise
Date: 28 Jul, 2014
From: <Tobias>

Hello,

we have the particle position and momentum of our primary particle given at the z=0 position, but we need to start this primary particle at z=-9m. In addition we have a magnetic dipole field in our setup which should be considered in the backwards extrapolation.

Is there a possibility to use a Geant4 function to calculate the x and y position as well as the momentum of the particle at z=-9m before we generate the primary vertex?

Thanks in advance!

Tobias

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