Problem 210

Summary:	magnetic field with Vacuum
Product:	Geant4	Reporter:	Michel.Maire
Component:	geometry/magneticfield	Assignee:	John Apostolakis <John.Apostolakis>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	P2
Version:	2.0
Hardware:	PC
OS:	Linux

Description Michel.Maire 2001-01-29 10:22:27 CET

The macro below, to be run with extented/electromagnetic/TestEm5,
show that it is not possible to set a magnetic field in the World,
if this World is made of low density material, like "Galactic".

#
# Macro file for the initialization phase of "TestEm5.cc"
#
# It creates the default geometry (simple absorber box )
#
/control/verbose 2
/run/verbose 2
#
/calor/setWorldMat Air
/calor/setAbsMat XenonGas
/calor/setField 10 tesla
#
/gun/particle proton
/gun/energy 10 MeV
/tracking/verbose 1
#
/step/setMaxStep 1 mm
/run/beamOn 10
#
##/calor/setWorldMat Air
##/calor/setAbsMat Galactic
##/run/beamOn 10
#
##/calor/setWorldMat Galactic
##/calor/setAbsMat XenonGas
##/run/beamOn 10

Comment 1 John Apostolakis 2001-06-20 12:35:59 CEST

A protection has been added in the magnetic field classes which corrects the
problem seen in this case.  The tag containing these fixes geomvol-V03-01-08 is
now accepted, and should appear in the next public release, 3.2

Comment 2 Michel.Maire 2001-07-16 07:32:59 CEST

I tried Geant4 V3.2, the problem seen with the attached macro is still here.

Comment 3 John Apostolakis 2002-01-23 10:35:59 CET

The changes in Geant4 3.2 were activated by default.
This has now been corrected -- and the fixes have been included in Geant4 4.0.