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This section describes the process of constructing a model of teh optics of the accelerator suitable for applications.
The problem is by which we get from a beamline designer's view of the accelerator (the "geometry" - the physical layout of the machine and its gross beamline elements) to the "lattice" (how the beam is constrained in terms of controllable devices), to the description of the transport system "optics" (R-matrices and Twiss parameters) used in online model based applications.
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