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MCNPX User’s Manual
Version 2.3.0, April 2002
LA-UR-02-2607
Accelerator
Production
of Tritium
The following example shows a case of three intersection Gaussian parallel beams, each
defined with the parameters a=0.2cm, b=0.1cm and c=2 in the notation previously discussed. For each, the beam is normal to the plane of definition.
•
Beam 1 is centered at (0,0,-2) with the major axis of the beam distribution along the
x-axis, emitted in the +z direction, with relative intensity 1.
•
Beam 2 is centered at (-2,0,0) with the major axis of the beam distribution along the
y-axis, emitted in the +x direction, with relative intensity 2.
•
Beam 3 is centered at (0,-2,0) with the major axis of the beam distribution along the
line x=z, emitted in the +y direction, with relative intensity 3.
The card SBn is used to provide equal sampling from the three beams which is independent of the relative intensities. This example demonstrates most of the new features. The
input cards are as follows:
Title
c Cell cards
...
999
0
-999
! cookie cutter cell
c Surface Cards
...
999
SQ
25
100
0 0 0 0 -4 0 0 0
c Control Cards
SDEF
DIR=1 VEC=0 0 1
X=D1
Y=D2
SP1
-41
.470964
0
SP2
-41
.2358482
0
SI3
L123
SP3
123
SB3
111
TR1
0 0 -2
100
010
001
TR2
-2 0 0
010
001
100
TR3
0 -2 0
.707 0.707
.707 0 -.707
MCNPX User’s Manual
! cookie cutter surface
Z=0
CCC=999
TR=D3
010
87