Dear Lifi,
On Tue, Jul 23 2019, at 16:42 +0000, Huang, Lifi wrote:
>
>Dear FLUKA experts,
>
>
>I have another short question regarding particle tracking/latching:
>
>
>In the usdraw subroutine of mgdraw, if I add:
>
>
>IF (ICODE.EQ.101) THEN:
>
> ISPUSR(1)=MREG
>
>ENDIF
>
>
>am I correct to assume that this will save the region where the daughter particle was created?
Yes.
>What happens if the same mother particle generates two secondaries in two different regions, will both secondaries inherit the same MREG or the correct (different) ones? Or does FLUKA consider everything resulting from an inelastic interaction a secondary?
More savvy FLUKers may want to comment/correct on this subtle point, but
after a nuclear inelastic interaction, all emerging particles are
secondaries. And for good reason: in the final state after a collision
one can generally not distinguish/label/identify the incoming projectile
anymore.
Thus, one cannot strictly speak of "the mother particle producing two
secondaries in two different regions". If a parent particle's generation
number is N and it undergoes a nuclear inelastic interaction, all
produced particles have generation number N+1, and at this point you can
strictly speaking no longer identify the parent particle among them.
Still, you can keep track of where interactions happened, how to
propagate them, etc. See e.g.
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/6241.html
Cheers,
Cesc
>Lifi Huang
>MSc Student
>E041
>Medical Physics in Radiooncology
>
>German Cancer Research Center (DKFZ)
>Foundation under Public Law
>Im Neuenheimer Feld 280
>69120 Heidelberg
>Germany
--
Francesc Salvat Pujol
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
Tel: +41 22 76 64011
Fax: +41 22 76 69474
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Received on Wed Aug 14 2019 - 09:40:59 CEST