problem with geometry

From: kaushik banerjee (kau_benj@yahoo.co.in)
Date: Sat Sep 01 2007 - 07:59:57 CEST

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Dear FLUKA development team,

I am interested in studying few MeV neutrons (AmBe source) tranport through a paraffin block and want to count the neutron track in a 2”by 2” liquid scintillator detector placed 33cm from the paraffin block along z-axis.
  I analyse the fluka result using ustsuw program.

  First (paraffin6.inp) I used one RPP as paraffin block and one RCC as my Liquid scintillator detector , I didn’t found any count in my detector .

   Then (paraffin5.inp) I slightly change my geometry using only one RPP and divided it in three parts using planes XYP, and I got count in my detector portion.
  with regards

---------------------------------
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*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
GLOBAL 4.0
TITLE
Neutron fluence inside and around a neutron-irradiated Paraffin target
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
*BEAM 50.E00 NEUTRON
BEAM -0.0102 0.0 0.0 0.0 0.0 0.0 NEUTRON
BEAMPOS 0.0 0.0 -33.0
SOURCE
*
GEOBEGIN COMBINAT
                         A simple Be target inside vacuum
  RPP 1 -5000.0 +5000.0 -5000.0 +5000.0 -5000.0 +5000.0
  RPP 2 -1000.0 +1000.0 -1000.0 +1000.0 -1000.0 +1000.0
  RPP 3 -12.5 +12.5 -6.5 +6.5 0.0 +43.0
* RPP 4 -12.5 +12.5 -6.5 +6.5 +5.5 +8.5
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
* RCC 4 0.0 -2.5 33.0 0.0 5.0 0.0
* 2.5
* RCC 4 0.0 0.0 0.0 33.0 33.0 33.0
* 2.5
  XYP 4 10.0
  XYP 5 38.0
  END
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
* black hole
  1 5 +1 -2
* Air around
  2 5 +2 -3
* Paraffin block
  3 5 +3 +4
* air b/w paraffin block and detector
  4 5 +3 -4 +5
* detector
  5 5 +3 -5
  END
GEOEND
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
MATERIAL 4.0 9.0122 1.848 5.0 BERYLLIU
*MATERIAL 0.0 0.00 0.001205 26.0 AIR
*COMPOUND -0.000124 6.0 -0.755268 7.0 -0.231781 8.0 AIR
*COMPOUND -0.012827 20.0 AIR
MATERIAL 0.93 27.0 PARAFFIN
COMPOUND -0.148605 3.0 -0.851395 6.0 PARAFFIN
* Polythene (mat. 29): H (material 3) and C (material6)
MATERIAL 0.94 29.0 POLY-CH2
COMPOUND 2.0 3.0 1.0 6.0 POLY-CH2
*MATERIAL 0.0 0.0 1.0 28.0 WATER
*COMPOUND 2.0 3.0 1.0 8.0 WATER
*LOW-MAT 3.0 1.0 -3.0 293.0 HYDROGEN
MATERIAL 0.0 0.0 1.0 20.0 WATER
COMPOUND 2.0 3.0 1.0 8.0 WATER
MATERIAL 0.0 0.0 0.001205 24.0 AIR
COMPOUND -0.000124 6.0 -0.755267 7.0 -0.231781 8.0 AIR
COMPOUND -0.012827 9.0 AIR
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
LOW-NEUT 0.0
*LOW-NEUT 72.0 22.0 6.7032E-3 2.0 1.0 11.0
*LOW-BIAS 70.0 72.0 0.95 3.0 4.0 0.0
*PART-THR -0.002 1.0 10.0 1.0 0.0 1.0
*DETECTOR
ASSIGNMAT 20.0 5.0
* region b/w paraffin block and detector
ASSIGNMAT 24.0 4.0
* Paraffin block
ASSIGNMAT 27.0 3.0
* External Black Hole
ASSIGNMAT 1.0 1.0
* Air
ASSIGNMAT 24.0 2.0
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
* e+e- and gamma production threshold set at 100 KeV
EMFCUT -1.0E-9 1.0E-9 0.0 20.0 27.0 PROD-CUT
* score in each region energy deposition and stars produced by primaries
* SCORE 208.0 8.0 7.
SCORE 208.0 211.0
*SCORE ENERGY BEAMPART
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
USRTRACK -1.0 8.0 -48.0 5.0 1000.0 20. nuFluen
USRTRACK 3.0 0.0 &
USRTRACK -1.0 1.0 -49.0 5.0 1000.0 20. prFluen
USRTRACK 3.0 0.0 &
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
RANDOMIZE 1.0
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
START 5000000.0
STOP

*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
GLOBAL 4.0
TITLE
Neutron fluence inside and around a neutron-irradiated Paraffin target
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
*BEAM 50.E00 NEUTRON
BEAM -0.3025 0.0 0.0 0.0 0.0 0.0 NEUTRON
BEAMPOS 0.0 0.0 -33.0
SOURCE
*
GEOBEGIN COMBINAT
                         A simple Be target inside vacuum
  RPP 1 -5000.0 +5000.0 -5000.0 +5000.0 -5000.0 +5000.0
  RPP 2 -1000.0 +1000.0 -1000.0 +1000.0 -1000.0 +1000.0
  RPP 3 -12.5 +12.5 -6.5 +6.5 0.0 +5.0
* RPP 4 -12.5 +12.5 -6.5 +6.5 +6.0 +8.5
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
  RCC 4 0.0 -2.5 33.0 0.0 5.0 0.0
                 2.5
* RCC 4 0.0 0.0 0.0 33.0 33.0 33.0
* 2.5
* XYP 5 5.0
* XYP 6 38.0
  END
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
* black hole
  BH1 5 +1 -2
* Air around
  AR2 5 +2 -3 -4
* Paraffin block
  PF3 5 3
* air b/w paraffin block and detector
* 4 5 +3 -5 +6
* detector
  DE4 5 4
  END
GEOEND
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
MATERIAL 4.0 9.0122 1.848 5.0 BERYLLIU
*MATERIAL 0.0 0.00 0.001205 26.0 AIR
*COMPOUND -0.000124 6.0 -0.755268 7.0 -0.231781 8.0 AIR
*COMPOUND -0.012827 20.0 AIR
*MATERIAL 0.93 27.0 PARAFFIN
*COMPOUND -0.148605 3.0 -0.851395 6.0 PARAFFIN
* Polythene (mat. 29): H (material 3) and C (material6)
*MATERIAL 0.94 29.0 POLY-CH2
*COMPOUND 2.0 3.0 1.0 6.0 POLY-CH2
*MATERIAL 0.0 0.0 1.0 28.0 WATER
*COMPOUND 2.0 3.0 1.0 8.0 WATER
*LOW-MAT 3.0 1.0 -3.0 293.0 HYDROGEN
MATERIAL 0.0 0.0 1.0 20.0 WATER
COMPOUND 2.0 3.0 1.0 8.0 WATER
MATERIAL 0.0 0.0 0.001205 24.0 AIR
COMPOUND -0.000124 6.0 -0.755267 7.0 -0.231781 8.0 AIR
COMPOUND -0.012827 9.0 AIR
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
LOW-NEUT 72.0 22.0 6.7032E-3 2.0 1.0 11.0
LOW-BIAS 70.0 72.0 0.95 3.0 4.0 0.0
PART-THR -0.002 1.0 10.0 1.0 0.0 1.0
*DETECTOR
ASSIGNMAT 20.0 4.0
* region b/w paraffin block and detector
*ASSIGNMAT 24.0 4.0
* Paraffin block
ASSIGNMAT 20.0 3.0
* External Black Hole
ASSIGNMAT 1.0 1.0
* Air
ASSIGNMAT 2.0 2.0
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
* e+e- and gamma production threshold set at 100 KeV
EMFCUT -1.0E-9 1.0E-9 0.0 20.0 27.0 PROD-CUT
* score in each region energy deposition and stars produced by primaries
* SCORE 208.0 8.0 7.
SCORE 208.0 211.0
*SCORE ENERGY BEAMPART
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
USRTRACK -1.0 8.0 -48.0 4.0 1000.0 100. nuFluen
USRTRACK 3.0 0.0 &
USRTRACK -1.0 1.0 -49.0 4.0 1000.0 20. prFluen
USRTRACK 3.0 0.0 &
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
RANDOMIZE 1.0
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
START 5000.0
STOP

*
*
*
3.250E-03 2.5151E+03
3.750E-03 1.9055E+03
4.250E-03 1.9233E+03
4.750E-03 2.4983E+03
5.250E-03 2.0782E+03
5.750E-03 2.0344E+03
6.250E-03 2.0628E+03
6.750E-03 1.3353E+03
7.250E-03 1.3713E+03
7.750E-03 1.6601E+03
8.250E-03 1.3330E+03
8.750E-03 6.1788E+02
9.250E-03 7.7370E+02
9.750E-03 9.3801E+02
1.025E-02 5.8393E+01

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