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MARK

A marker, equivalent to a zero-length drift space.
Parallel capable? : yes
Parameter Name Units Type Default Description
DX $M$ double 0.0 non-functional misalignment (e.g., for girder)
DY $M$ double 0.0 non-functional misalignment (e.g., for girder)
FITPOINT   long 0 Supply local values of Twiss parameters, moments, floor coordinates, matrices, etc. for optimization?
GROUP   string NULL Optionally used to assign an element to a group, with a user-defined name. Group names will appear in the parameter output file in the column ElementGroup





If FITPOINT=0, this element results only in generation of additional output rows in the various files that contain output vs s. For example, Twiss parameters, closed orbits, and matrices vs s will all contain a row for each occurrence of each marker element.

If FITPOINT=1, the element has additional functionality in the context of optimizations. In particular, for occurrence N of the defined element Element, a series of symbols are created of the form Element#N.quantity, where quantity has the following values:

The misalignment controls for this element are non-functional, in the sense that they do not affect the beam. However, when combined with external scripts and the GROUP parameter, one can use this feature to implement girder misalignments using pairs of markers to indicate the ends of the girders. A future version of elegant will implement this internally.


next up previous
Next: MATR Up: Element Dictionary Previous: MAPSOLENOID
Robert Soliday 2014-06-26