---------- Forwarded message ----------
From: "黄海栗" <huanghl_at_stu.xidian.edu.cn>
Date: 2014/12/22
Subject: statistical fluctuation error of low energy neutron reaction with lithium
To: "fluka-discuss" <fluka-discuss_at_fluka.org>
Dear FLUKA physics experts:
I am doing a jod about simulation of low energy neutron reaction with lithium. I found Statistical fluctuation error is too large in the output files.How can I get a good Statistical fluctuation error. My inp file is given below. Any assistance is greatly appreciated.
Many thanks.
Yuliang Qin
TITLE
1
*Set the defaults for precision simulations
DEFAULTS PRECISIO
*Define the beam characteristics
BEAM -0.02 NEUTRON
*Define the beam position
BEAMPOS 0.0 0.0 -1
GEOBEGIN COMBNAME
0 0
*Black body
SPH blkbody 0.0 0.0 0.0 100000.0
*Viod sphere
SPH void 0.0 0.0 0.0 10000.0
RPP target -0.1 0.1 -0.1 0.1 0.0 1E-5
END
*Black hole
BLKBODY 5 +blkbody -void
*Void around
VOID 5 +void -target
*Target
TARGET 5 +target
GEOEND
MATERIAL 3. 0.534 LITHIUM-6
LOW-MAT LITHIU-6 3. 6. 87. LITHIUM-6
*..+....1....+....2....+....3....+....4....+....5....+....6....+....7..
ASSIGNMA BLCKHOLE BLKBODY
ASSIGNMA VACUUM VOID
ASSIGNMA LITHIUM TARGET
LOW-NEUT 260. 42. 0.02 0.0 -11.
LOW-BIAS 15. 16. 0.85 TARGET TARGET 1.0
USRBDX 101. 4-HELIUM -21. TARGET VOID 0.04
USRBDX 0,02 10. 0.0 10. &
*Set the random number seed
RANDOMIZ 1.0
*Set the number of primary histories to be simulation in the run
START 10000000.
STOP
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Received on Tue Dec 23 2014 - 14:46:39 CET