From: wuzhen (wu_zhen01@mails.tsinghua.edu.cn)
Date: Sun Feb 23 2003 - 11:02:09 CET
Dear Fluka users,
As you know, when the energy of the electron beam above about 10Mev, if it hits the tungsten target, the photonuclear interactions will occur between the electrons (or the produced photons) with and the target nucleus. Photoneutron will be produced. I want to get the fluence distribution of photon in the distance of 1 cm. The following is my input file and result. Can anyone tell me where does the errors occur? Why linear energy binning is from 1.9600E-02 to 1.9600E-02 GeV, although I have defined the linear energy is from 0 to 1.9600E-02 Gev in the card of "USRBDX"? And in the standard output file, i find the cut-off kinetic energy for NEUTRON transport is 1.960E-02 GeV. Where can i change it? Any help will be appreciated!
Best wishes!
Zhen Wu
02/23/2003
Input file:
TITLE
Testing fluka: Beam of electron through tungstEn target
DEFAULTS NEW-DEFA
*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
BEAM -1.5E-2 0.0 0.0 0.0 0.0 1.0ELECTRON
BEAMPOS 0.0 0.0 -1.0
GEOBEGIN 0.0 COMBINAT
outer sphere and tungsten target
*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
RPP 1 -10.0 10.0 -10.0 10.0 -10.0 10.0
SPH 2 0.0 0.0 0.0 1.0
RCC 3 0.0 0.0 -0.06 0.0 0.0 0.12
0.5
END
*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
BL1 4 +1 -2
VA2 7 +2 -3
TU3 7 +3
END
GEOEND
*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
MATERIAL 74.0 184.0 19.3 23.0 0.0 0.0TUNGSTEN
LOW-MAT 74.0 74.0 -2.0 293.0 TUNGSTEN
*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
ASSIGNMA 1.0 1.0
ASSIGNMA 2.0 2.0
ASSIGNMA 23.0 3.0
*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
PHOTONUC 1111. 74.0
*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
LOW-NEUT 72.0 22.0 1.96E-2 0.0 1.0 0.0
LOW-BIAS 0.0 72.0 0.85 1.0 3.0 1.0
LOW-DOWN 0.0 1.5 1.0 3.0 1.0
*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
OUTLEVEL 1.0 7.0
*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
USRBDX 1.0 8.0 48.0 2.0 1.0 1.0Neutrons
USRBDX 1.96E-2 0.0 72.0 &
RANDOMIZ 1.0
START 10000.0 9999999.
STOP
Result:
***** Testing fluka: Beam of electron through tungstEn target *****
DATE: 2/23/ 3, TIME: 19:58:10
Total number of particles followed 10000, for a total weight of 1.0000E+04
1
Bdrx n. 1 "Neutrons " , generalized particle n. 8, from region n. 2 to region n. 1
detector area: 1.0000E+00 cm**2
low energy neutrons scored from group 1 to group 72
this is a one way only estimator
this is a current like estimator
linear energy binning from 1.9600E-02 to 1.9600E-02 GeV, 0 bins ( 1.5503E-03 GeV wide)
linear angular binning from 0.0000E+00 to 6.2832E+00 sr , 1 bins ( 6.2832E+00 sr wide )
Data follow in a matrix A(ie,ia), format (1(5x,1p,10(1x,e11.4)))
Low energy neutron data from group 1 to group 72 follow in a matrix A(ig,ia), format (1(5x,1p,10(1x,e11.4)))
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00
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