Hello Aaron,
As Maurik pointed out, there are also two other conditions
which end a track (decay of particle, and energy below a cutoff).
But back to the two "common" end conditions.
1) A particle will not go beyond the mother of all mother
volumes, which in blastmc is called "LAS-" (as you figured out).
The size of this is set in "blast_init.f", at line 1085;
C-- Master Reference System is a sphere: LAS-
CALL GSVOLU('LAS-', 'SPHE', int(BLASTfill), PARA, 6, IVOL)
PARA is an array with the parameters of the sphere, set at line 99;
C-- Size of the master reference system - a sphere:
C RMIN RMAX THE1 THE2 PHI1 PHI2
DATA PARA / 0.0, 600.0, 0.0, 180.0, 0.0, 360.0/
This is the 6 meter sphere which you see.
2) The maximum number of steps is set by the varable MAXNST
in line 116 of "blast_init";
MAXNST = 1000
this is part of the common block gctrak (section ZZZZ010-21, page 424
of the GEANT manual). You can also see this common block in
"include/geant/gctrak.inc", (note: we can not change files in
include/geant - that is the interface to the variables within the
GEANT library).
Good luck!
Tim
On Thu, 18 Oct 2001, Aaron Joseph Maschinot wrote:
>
> Hello, all:
>
> Does anyone know what the condition(s) is (are) for GEANT to stop keeping
> track of a particle? For example, I know one condition seems to be
> whether or not the particle has been tracked for 1000 steps. This
> variable can be changed inside of "blast_init.f". Another condition seems
> to be if the particle's total path length is greater than 600cm (i.e. the
> length of the radius of the LAS- volume). Is this one true? Where is this condition (and any others) set at? I know that
> tracking stops when the variable ISTOP is set equal to zero, but I can't
> find where (and why) this is done.
>
> Thanks,
>
> Aaron
>
-- ____________________________________________________________________ Timothy Paul Smith Research Scientist MIT Bates Lab tim_smith@mit.edu 21 Manning Rd. tel: (617) 253-9207 Middleton, MA 01949 fax: (617) 253-9599
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