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D
g
B
2
1
=
3Σ
t,
g
⎪
⎧
⎨
⎪⎩
π
2
⎪⎫
Σ
=
⎪⎭
t,
g
⎪
⎧
2 ⎬ ⎨
2
( BHGT + 2δ
) 3 ( Σ * BHGT + 1.4209)
g
⎪⎩
t,
g
π
2
⎪⎫
⎬
⎪⎭
Σ t,g
Here
2δ = 1.4209 / Σ is twice the Milne problem extrapolation distance.
g t,
g
is a total cross-section if it is prepared by anisotropic calculation routine
ANISN or TWOTRAN, otherwise
Σ t,g is a transport cross-section, because these
cross-sections are stored in the same position in MACRO file.
Use this option in (X,Y) and (R,θ) geometries only. If the negative value is
entered, the Milne extrapolation distance is not added to the buckling height.
Block-5
IHX(i)
Number of fine mesh intervals in each coarse-mesh i-interval.
/IM/
Block-6
IHY(j)
Number of fine mesh intervals in each coarse-mesh j-interval.
/JM/
Block-14
XRAD(i)
/IM+1/
Coarse i-mesh boundaries in cm. Must form increasing sequence including the
original point (0.0).
Block-15
YRAD(j)
/JM+1/
Coarse j-mesh boundaries in cm. Must form increasing sequence including the
original point (0.0).
Block-16
IDCS(i,j)
/IM*JM/
Material identification numbers by coarse mesh zone.
Material number is assigned by the order appearing in the material
specifications in Sect.2.9. Enter in the order : (IDCS(i,j),i=1,IM),j=1,JM).
If these numbers are negative, an anisotropic scattering source is calculated in
the coarse mesh zone; but the numbers need not be negative unless ISCT>0.
----- A sample input for Fig.2.6-1 -----
-2 -2 -3 / j=1
-1 -2 -3 / j=2 (Note : This map will be printed inversely)
-2 -2 -3 / j=3
-3 -3 -3 / j=4=JM
Block-19 Required if IEDOPT>0 (See 31st term in Block-3) /1/
NEDS Number of edits to be performed (See below)
84