Problem 914

Summary:	G4Exception: StuckTrack issued by G4Navigator with ellipsoids
Product:	Geant4	Reporter:	Susanna.Guatelli
Component:	geometry	Assignee:	Vladimir.Grichine
Status:	RESOLVED WORKSFORME
Severity:	normal
Priority:	P1
Version:	other
Hardware:	PC
OS:	Linux

Description Susanna.Guatelli 2006-11-29 11:38:43 CET

The error is with geant4-08-02-cand02.
Experimental set-up: electrons are incident on an ellipsoid
defined as G4Ellipsoid(G4String name, ax, by, cz, zcut1, zcut2), filled with
water. The ellipsoid is set in a world volume (filled with air).
The physics is active for e-, e+, photons.

Events are aborted with the following message:
-----------------------------
**G4Exception: StuckTrack
  issued by G4Navigator::ComputeStep()
StuckTrack: potential geometry or navigation problem
*** Event must be aborted
-----------

/afs/cern.ch/user/g/guatelli/public/ellipsoid/N01.tgz contains a simple G4
application that shows the problem. run_e-_geant4.8.2.cand02.out is an example
of output file (with the list of aborts).
500K primary particles have been generated.

Comment 1 Vladimir.Grichine 2006-12-01 08:58:59 CET

In application /afs/cern.ch/user/g/guatelli/public/ellipsoid/N01.tgz
there is bug in primary generator resulting
to generation of particles out of world. After fixing that
the application works without any messages.