From: Sebastien WURTH (wurth@ipno.in2p3.fr)
Date: Wed Feb 13 2008 - 12:42:20 CET
attached mail follows:
Hello,
I think it is in the definition of Cs and I : SDUMs of material cards
must be CESIUM and IODINE for linking to the neutron X-sections (please
look at the manual, chapter 10 "low energy neutrons in fluka").
Hope it helps.
Regards.
Sebastien.
Jiasen Ma a wrote :
>Dear All,
>
>When I run fluka on a detector of caesium iodide(CsI), Fluka
>seems to stop the physics process. At the end of the output
>file, there is this message:
>
> **** Low energy neutron xsec not found for some media 0 2 ****
> I
> Cs
>
>If there are no certain physics paramters available for low
>energy neutron interaction for CsI, can I tell Fluka to bypass
>this but still do the full simulation for other parts of the
>detector? (I need better neutron simulation for other
>materials than CsI) Or something else is wrong?
>
>I have a simple input card attached. It's also possible I made
>a stupid mistake in the material definition.
>
>Thanks a lot and thanks for your previous responses to my
>questions.
>
>Jiasen
>
>
>------------------------------------------------------------------------
>
>TITLE
>Particle production from 12-GeV (KE) protons on a Pt target
>*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
>GLOBAL 1.0
>DEFAULTS PRECISION
>SOURCE 1.0 1.0 13.0 pt13_
>BEAM 15.0 NEUTRON
>PHYSICS 1000. 1000. 1000. 1000. 1000. 1000. PEATHRESH
>*EMF OFF
>*LOW-BIAS 1.0
>*LOW-MAT 26.0 74. -2. 293. TUNGSTEN
>*LAM-BIAS 1.0E+10 13. 16. 1.GDECAY
>*
>GEOBEGIN COMBINAT
> 0 0 A simple Pt target inside vacuum
>SPH BlakHole 0.0 0.0 0.0 3000.0
>SPH World 0.0 0.0 0.0 2000.0
>RCC CSITG 0.0 0.0 550.0 0.0 0.0 600.0 100.0
>END
>R1bh 2 +BlakHole -World
>R2World 2 +World -CSITG
>RCSITG 2 +CSITG
>END
>GEOEND
>*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
>MATERIAL 53.0 126.900 1.9300 26.00 I
>MATERIAL 55.0 132.910 7.1400 27.00 Cs
>MATERIAL 0.0 0.0000 4.53 28.00 CSI
>COMPOUND 1.0 26.0 1.0 27.00 CSI
>*
>ASSIGNMAT 1.0 1.0
>ASSIGNMAT 2.0 2.0
>***MB(vac is with world)
>ASSIGNMAT 28.0 3.0
>*
>*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
>* e+e- and gamma production threshold set at 10 MeV
>*EMFCUT -0.010 0.010 1.0 12.0 PROD-CUT
>* Boundary crossing current in the middle of the target (log intervals, one-way)
>USRBDX 1.0 201.0 47.0 4.0 2.0 1. CurrUD
>USRBDX +15.0 +15.0 0.0 &
>USRBDX 1.0 201.0 47.0 6.0 2.0 1. CurrUD
>USRBDX +15.0 +15.0 0.0 &
>* Call MGDRAW
>USERDUMP 101.0 2. prod
>*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
>RANDOMIZE 1.0 128352042.
>*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
>START 200000.0
>STOP
>
>
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