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None Tracking of heavy ions 

Forum: Fields: Magnetic and Otherwise
Date: Apr 29, 03:42
From: Volodymyr Rodin <Volodymyr Rodin>

Dear Geant4 users,

I am doing a simulation of the magnetic spectrometer with heavy ions As I was seeing, the tracking took into account the dynamic charge of the ion from the beginning(I assume value depends on media). Even for G4_Galactic world material initial charge is less than a charge of the ion. Can you give some link or reference how it's calculated. Particle: Ra234, fully ionized, P = 32.024 GeV

Another question is what are the best parameters for field integration and how they depend on momentum/energy? Currently, I am using these and obtaining extra Px momentum around 0.001 % of Pz as an error, please look on the attached image for geometry.

 deltaChord=0.05 mm
 deltaOneStep=0.01 mm
 deltaIntersection=0.001 mm
 epsMax=0.01
 epsMin=2.5E-7
 step inside field is limited to 0.02 mm

Best regards,

Volodymyr

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2019/04/29/03.41-35802-Spectrometer.png

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