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Track pruning selects the path(s) in a history that lead from the source to desired cell(s) and/or surface(s). A history may consist of a number of particles, not all of which are of interest.
Pruning is controlled with the Pruning dialog
(and with the TRACK
PRUNE commands).
All histories, branches, and events are marked as desirable, filtered, or pruned. Pruned and filtered elements are not displayed nor included when a track file is written. Filters cannot retrieve pruned elements and make them desirable. Filtered elements are reset to acceptable before pruning. Successive pruning operations can only result in more pruned elements; previously pruned elements are not made acceptable.
The Prune
To box specifies the pruning criterion,
which may be a list of Cells,
Surfaces, or the track file
Header.
The first two select histories that enter a cell or cross a surface
in the list and discard all branches in the selected histories that
are not in the path from the source to the cell or surface.
Paths that were discarded by a previous pruning operation and
satisfy the current selection are not selected
(use Reset to enable selection).
If the MCNP PTRAC input specified cell and/or surface filters, those cell(s) and surface(s) are listed in the file header data. Pruning with the Header criterion searches for that data and prunes the tracks to those cells and/or surfaces. A warning is given and no pruning is done if the data does not exist.
When Branches/History is checked, pruning selects and marks desirable the first N branches that satisfy the pruning criteria where N is the integer value in the edit field to the right. If unchecked, all branches that satisfy the criteria are selected.
When the Continue Track box is checked, the track path is continued past the pruning surface or cell to the branch’s termination. Otherwise, the path ends at the cell or surface. Figure 123 was made with Continue Track enabled.
The Prune button performs the pruning operation.
The Reset button discards all pruning and marks all track elements as desirable.