Magnetic field + Vacuum strange trajectories

[jw3126]

Magnetic fields in vacuum give me weird results. See below for an example. In Air I get a spiral trajectory around the field lines as expected. In Vacuum something strange happens.

Air

Vacuum

/vis/open OGLIQt
/vis/drawVolume
/vis/viewer/set/style wireframe
/vis/viewer/flush
/tracking/storeTrajectory             1
/vis/scene/add/trajectories
/vis/modeling/trajectories/create/drawByCharge
/vis/scene/endOfEventAction           accumulate -1
/vis/scene/add/axes 0 0 0 50 cm
/gate/geometry/setMaterialDatabase data/GateMaterials.db
# World
/gate/world/geometry/setXLength 1.0 m
/gate/world/geometry/setYLength 1.0 m
/gate/world/geometry/setZLength 1.0 m
/gate/world/setMaterial         Vacuum
# physics
/gate/physics/addPhysicsList emstandard_opt3

# StatsActor187
/gate/actor/addActor                    DoseActor StatsActor187
/gate/actor/StatsActor187/save                  /tmp/juliaFgarML/StatsActor187.txt
/gate/actor/StatsActor187/attachTo              world
/gate/actor/StatsActor187/saveEveryNSeconds     60


/gate/geometry/setMagField 1.0 1.0 0.01 T

/gate/run/initialize
/gate/source/addSource GPS186     gps
/gate/source/GPS186/gps/particle  e-
/gate/source/GPS186/gps/direction 0.0 0.0 -1.0
/gate/source/GPS186/gps/centre    0.0 0.0 0.0 mm


/gate/source/GPS186/gps/energytype Mono 
/gate/source/GPS186/gps/monoenergy 10.0 MeV


/gate/source/GPS186/gps/pos/type  Plane
/gate/source/GPS186/gps/shape     Rectangle
/gate/source/GPS186/gps/halfx     10.0 cm
/gate/source/GPS186/gps/halfy     10.0 cm
# JamesRandom Ranlux64 MersenneTwister
/gate/random/setEngineName MersenneTwister
/gate/random/setEngineSeed auto

#/tracking/verbose 1

/gate/application/noGlobalOutput
/gate/application/setTotalNumberOfPrimaries 1
/gate/application/start