tiParam.par
A typical tiParam.par file has parameters
as described in this document. They are:
- primaryCheck: If greater than or equal to zero, the code
runs a group finding algorithm with a 0.5 arcsec linking length. The
value of primaryCheck is the maximum number of members of groups with
multiplicity greater than one are allowed. This provides a check on
the setting of primary.
- relaxMargin: In the "relaxed assignment" section of the
cost minimization, use this value times the tile radius as the
"relaxed" tile radius.
- tileRadius: Radius of a tile in degrees
- maxFibresPerTile: Number of available fibers per tile.
- minFibreSpacing: Closest two fibers can be placed on the
same tile (in arcsec).
- limitCombinationIter: When optimizing the resolution of
collisions, it is possible to get into situations where you need
exponentially many operations to optimally solve a group. This value
is the maximum number of operations allowed per group during cost
minimization.
- limitCombinationFinal: Same as the last, but this is larger,
because this is the maximum number during the the final fiber
allocation.
- minFOFChunkSize: To do the friends-of-friends quickly, we
break up the region into little chunks (which overlap), do FOF in
each, and then do the book-keeping to link the groups across the
edges. This parameter gives the size of the chunks. It has to be
bigger than twice the linking length (the fiber collision length, that
is).
- onlyDecollided: If set to 1, base the tile perturbations
only on the decollided objects. This is generally what you want to do.
- costFunctionIndex: The power law index of the cost
function. Set it between 0.5 and 2. A good rule of thumb is that
the smaller the chunk and the more tiles which are close to the edge,
the smaller the costFunctionIndex should be. This is because it rarely
pays to chase after targets far away in such situations, since edge
effects are so important.
Snail Mail:
Michael Blanton;
Email:
blanton@fnal.gov