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7/28/2019 1. a General Exercise Showing the Creation of an Input File
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1.0 Example: Create Simple Geometries Using the VisualEditor
This section will contain step by step instructions for creating an input file using the VisualEditor. For this example, a cube within a sphere will be created. Figure 1-1 displays the
finished geometry.
Figure 1-1 Final Result of Geometry Creation Example.
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Start the Visual Editor.
Use Windows Explorer to bring up the Visual Editor. Figure 1-2shows a view of the initial
screen. Notice that the main menu functions are shown across the top and that each plot windowhas its own set of plot commands.
Figure 1-2 Startup Configuration for the Visual Editor
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Figure 1-3 Creating the Sphere Surface
Creating a Sphere
On the Visual Editor Main Menu, clickon Surface. This will open the Surface Panel. Figure
1-3shows the result.
On the Surface Panel, note that the Surface Type is the default type which is a sphere centered at
the origin (so).
Type 50 in the 1st
Coefficient Box (the Radius).
Click on Register on the Cell Panel Menu.
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Figure 1-4 Display of Created Spherical Surface
The Visual Editor will display a large red circle once Register is selected. Surfaces are red in theVisual Editor if they are not currently assigned to a cell. Figure 1-4shows the circle displayedon both plots.
Creating the Planes
To create the cube inside the sphere, six plane surfaces must be created. Specifically, two px,
two py, and two pz planes. A px plane is a plane normal to the X axis, intersecting it at a point
on the axis. Similarly, a py plane is a plane normal to the Y axis and a pz plane is a plane normalto the Z axis.
On the Surface Panel Menu Bar, click on SurfacePlanepx. Figure 1-4 illustrates this step.
On the Surface Panel, Type 20 in the first coefficient box (as indicated inFigure 1-5)Clickon Register.
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Figure 1-5 Sphere and First px Plane
Create the other planes.
Type -20 (note that it is negative 20) in the first coefficient box to set the distance D.
Click Register
Click on SurfacePlanepy.
Click on Register. (using the previous value of -20)
Type 20 (note that it is positive 20) in the first coefficient box to set the distance D.
Click on Register.
Click on SurfacePlanepz.
Click on Register. (using the previous value of -20)
Type -20 (note that it is negative 20) in the first coefficient box to set the distance D.
Click on Register.
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Figure 1-6 Sphere and Six Plane Surfaces shows the result.
Figure 1-6 Sphere and Six Plane Surfaces
Click Close to close the Surface Panel.
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Figure 1-7 Selecting First Surface in Creation of Cube Cell
Create the Cube Cell
A cell is defined by selecting surfaces to bound a region and then choosing a point that is entirelyinside or entirely outside all the surfacesto set the sense for the surfaces.
On the Main Menu, Click on Cell to open the Cell Panel.
On the Left Plot Window, Drag the mouse across Surface 2 as indicated by the dashed line in
Figure 1-7. Notice that the line showing Surface 2 becomes blue once it has been selected.
Drag across the other three plane surfaces on the Left Plot window.
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Figure 1-8 Using Both Plot Windows to Select Cube Surfaces
To specify a cube, six surfaces must be specified. Only four surfaces are visible from the Left
Plot window. It is necessary to use the Right Plot window to specify the py surfaces. Figure 1-8illustrates this concept.
Drag across the two py surfaces in the Right Plot Window as indicated by the dashed lines in
Figure 1-8.
A point must be selected to indicate whether the cell will be inside these surfaces or outside
them. For more information, see the discussion withFigure 1-13 Defining the Point to
Determine Cell Sense.
Click in the center of the square on either Plot Window.
In the message box on the cell panel, it should say Point Accepted.
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Figure 1-9 Define Point, Paste and Register
Once a region has been defined, it may be either added (with Paste) to the area that will be
included in the cell or subtracted (with Cut) from it. In this case, the region that has beendefined will be added to the cell so Paste is the correct choice.
Click Paste on the Cell Panel menu to add this region to the cell definition.
Click Register on the Cell Panel menu to create the cell.
Figure 1-10shows the cube cell as Cell 1.
Click the Cell Number toggle to turn on Cell Numbers (as indicated inFigure 1-10)
The lines on the square turn green when pasted and then return to red when registered. They are
still red because a cell exists inside the surfaces but not outside them.
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Figure 1-10 Display of Cube Cell.
Create the Outside World
All space must be defined in a valid MCNP geometry so there must always be an OutsideWorld. In this case, the outside world is all the space outside the sphere.
Drag across the sphere surface.
Click INSIDE the sphere as indicated inFigure 1-11. For more information, see the discussion
withFigure 1-13 Defining the Point to Determine Cell Sense.
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Figure 1-11 Create Sphere Cell
The outside world will consist of all area that is not inside the sphere. This may be defined by
pasting all the area outside the sphere or by cutting out the area within the sphere. In thiscase, the area within the sphere will be cut out.
Click Cut.
Click Register.
Figure 1-12 Cube Cell and Outside Worldshows the result.
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Figure 1-12 Cube Cell and Outside World
Defining the Point to Determine Cell Sense.
When creating cells, the point determines the cell sense. When the bounding surface is a
sphere, defining the point within the center of the sphere means that the cell will include the areainside the sphere. Similarly, if the point is defined by clicking a location outside the sphere, the
cell will include the area outside the sphere (but not inside).
While this is fairly obvious for spheres, it is more complex with planes forming shapes such as a
cube.
InFigure 1-13, choosing Point 1 can specify the inside of the sphere. It does NOT specify the
outside of the cube. Point 1 specifies an area that is:
Right of Surface 2,Below Surface 6,Above Surface 7, and
Right of Surface 3.
Choosing Point 1 causes the sense (direction) of Surface 3 to incorrectly be defined as right of
surface 3.
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Figure 1-13 Defining the Point to Determine Cell Sense
Similarly, Point 2 can specify the inside of the sphere. It does NOT specify the outside of the
cube. Choosing Point 2 to define the outside of the cube incorrectly causes the sense of
Surface 6 to be defines as below surface 6.
Point 3 can define the inside of the cube or the inside of the sphere.
Point 4 can define the outside of the sphere but NOT the outside of the cube.
To choose the area between the sphere and the cube, the user must first define a cell that includes
the inside of the sphere (paste) and then subtract the area inside the cube (cut).
Creating the Cell Inside the Sphere and Outside the Cube
As discussed above, this cell will be created by first creating the region inside the sphere and
then cutting out the region inside the cube.
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Figure 1-14 Paste Inner Sphere
Drag the mouse across the sphere surface to select it.
Click inside the sphere (it does not matter whether it is inside the cube or not).
Click Paste on the Cell Panel.
This will paste the interior of the sphere into the cell definition.
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Figure 1-15 Cut Cube from Sphere
Drag the mouse across all six planes (use the right plot to get the py planes). This step isillustrated by the dashed lines inFigure 1-15.
Click inside the cube to establish the sense as inside the cube.
Click on Cut on the Cell Panel.
This will cut away the area inside the cube from the area inside the sphere.
Click on Register.
Cell three has now been created and consists of the area inside the sphere but outside the cube.
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Figure 1-16 Geometry with Three Cells Created
Figure 1-16shows the completed cells. Valid MCNP cells are shown in black.