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PAlet
pld.txt
.
Formatting considerations restrict the total number of materials
in the geometry model to less than 500.
PD Auto R N Xc Yc Zc
Calculate the path length distributions along a number of rays
starting on a sphere of radius R centered at
(Xc
, Yc
,
Zc
) and ending at the center of the sphere.
The polar angle phi
and equatorial angle theta
are related to the Cartesian coordinates on the surface of the sphere by
Z = R
cos(phi) + Zc
X = R
sin(phi) cos(theta) + Xc
Y = R
sin(phi) sin(thetatheta) + Yc
If N
< 0,
|N
| rays are started at random
positions on the sphere.
The polar angle and the equatorial angle or its cosine is sampled
independently with no weighting.
If N
> 0,
rays are started from an angular grid with N
polar angles and 2N
+ 1 equatorial angles.
Two additional rays are directed along the poles (phi
= 0 degrees
and phi
= 180 degrees). The polar angles are distributed equally in phi
or cos(phi) according to the
Solidangle
setting .
In addition to put being written to the log file
pld.txt
and summary information to the
QUERY window
on the screen, Sabrina also writes a particle track file
(in MCNP ascii PTRAC format) pld.tra
.
A plot of the particle tracks along with the model geometry
may aid in determining whether the angular coverage of the rays is sufficient.
Existing pld.txt
and
pld.tra
files are overwritten on each PD
A
command.
PD Xs Ys Zs Xe Ye Ze
Find the path length distribution along a ray starting at
(Xs
, Ys
, Zs
)
and ending at (Xe
, Ye
, Ze
).
At each surface crossing, Sabrina writes information to the
QUERY window including the
surface, cell and material entered, and the path length in the previous cell.
When the ray terminates, the window displays the total path length
for each material for this ray.
PD Solidangle { | ON | OFf }
When Solidangle
is
ON
, the equatorial angles
are distributed equally in cos(phi) for a regular grid;
for random rays, cos(phi) is sampled.
When OFF
,
the regular distribution is in phi
and phi
is sampled directly for random rays.
Sabrina reports the current setting when no argument is present.
PD Verbose { | ON | OFf }
The Verbose
mode controls
the amount of the information written to the pld.txt
log file when using the PD
A
command.
When the Verbose mode is On
,
the log file contains the starting position and path length distribution
for each ray as well as a summary for the entire set of rays.
When Off
,
the log file contains only the summary.
Sabrina reports the current setting when no argument is given.
PD
Show a summary of the PD
command arguments.