From: Alberto Fasso' (fasso@SLAC.Stanford.EDU)
Date: Wed Jun 07 2006 - 00:56:46 CEST
You have activated photonuclear reactions only for material 4, but your
target is made of iron (material 11 in your input). There is also a comment
line which says "Be target", but 11 is defined as iron. In any case,
material 4 (Helium) is not used anywhere.
The same mistake is in your command PAIRBREM: you need to realize that not all
commands are specified by region. Some of them, like PHOTONUC and
PAIRBREM, are specified by material.
You should also add a command LAM-BIAS, to decrease the photon nuclear
interaction length, otherwise you will never get sufficient statistics.
Alberto
On Tue, 6 Jun 2006, liujt wrote:
> if this letter bother you, i'm sorry for that
> i have simulated some example,and i can get right result
> recently,i simulate the neutron yield with electron beam effecting with the target
> and the target material is iron.i can get photon score,but i can't get any neutron score in the result
> this question have bother me many days,and i have change the material of the target.however i can't get
> any neutron .
> could you tell me what can i do
> thank you for your attention
>
>
> *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
> TITLE
> Electron fluence inside and around a Fe target
> *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
> BEAM 1.89 ELECTRON
> BEAMPOS 0.0 0.0 -50.0
> *
> GEOBEGIN COMBINAT
> A simple Fe target inside vacuum
> RPP 1-5000000.0+5000000.0-5000000.0+5000000.0-5000000.0+5000000.0
> RPP 2-1000000.0+1000000.0-1000000.0+1000000.0-1000000.0+1000000.0
> RPP 3 -20.0 +20.0 -20.0 +20.0 -20.0 +20.0
> RPP 4 -10.0 +10.0 -10.0 +10.0 0.0 +5.0
> END
> * black hole
> BH1 5 +1 -2
> * vacuum around 1
> VA2 5 +2 -3
> * vacuum around 2
> VA3 5 +3 -4
> * Fe target
> FE4 5 +4
> END
> GEOEND
> *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
> MATERIAL 26.0 55.845 7.874 11.0 IRON
> *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
> * Be target
> ASSIGNMAT 11.0 4.0
> * External Black Hole
> ASSIGNMAT 1.0 1.0
> * Vacuum
> ASSIGNMAT 2.0 2.0
> ASSIGNMAT 2.0 3.0
> *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
> LOW-BIAS 0.0 74.0 1.0 4.0 4.0 1.0
> LOW-MAT 11.0 26.0 -2.0 293.0 0.0 0.0 IRON
> LOW-NEUT 72.0 22.0 0.0196 1.0 0.0 -9.0
> PAIRBREM 3.0 0.0 0.000001 4.0 4.0 1.0
> EMFCUT 0.0 0.0 0.0 4.0 4.0 1.0 PHOT-THR
> EMFCUT 0.0 0.0 0.0 4.0 4.0 1.0 PHO2-THR
> PHOTONUC 1.0 0.0 0.0 4.0 4.0 1.0
> * score in each region energy deposition and stars produced by primaries
> SCORE 208.0 210.0 8.0
> * Boundary neutron crossing current from the target to the vacuum
> USRBDX +1.0 8.0 -47.0 4.0 3.0 n-out
> USRBDX +1.89 +50.0 0.0 0.0 0.0 &
> * Boundary photon crossing current from the target to the vacuum
> USRBDX 1.0 7.0 -47.0 3.0 4.0 ph-out
> USRBDX +1.89 +50.0 0.0 0.0 0.0 &
> * Boundary electron crossing current from the target to the vacuum
> USRBDX 1.0 3.0 -47.0 3.0 4.0 e-out
> USRBDX +1.89 +50.0 0.0 0.0 0.0 &
> * Boundary charged particle crossing current from the target to the vacuum
> USRBDX 1.0 202.0 -47.0 3.0 4.0 ch-out
> USRBDX +1.89 +50.0 0.0 0.0 0.0 &
> *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
> RANDOMIZE 1.0
> *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
> START 1000.0
> STOP
>
>
-- Alberto Fassò SLAC-RP, MS 48, 2575 Sand Hill Road, Menlo Park CA 94025 Phone: (1 650) 926 4762 Fax: (1 650) 926 3569 fasso@slac.stanford.edu
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