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15.2 Geometry
15.2.1 Coordinates of the principal elements
Please refer to annex D for the coorinates of the beam line at a0.
15.2.2 Dogleg lattice coordinates
Figure 15.1 displays the coordinates of the dogleg at a0, thanks to Bruce Popper (Fermilab)
Table 15.2 reference the coordinates of the dipoles where the origin is taken at the entrance of the first dipole. See figure 3 for convention of notations. The column 
and 
corresponds to the real geometry(cf figure 15.1) expressed with respect to the entrance point in the first dipole. Nevertheless, Astra will refuse this geometry as it induces a fringe field overlapping inside the dipole. To avoid this we will have to shorten the height of the two trapezoidal magnets. The results from this operation correspond to column 3 and 4. The first dipole being at 
mm, we write the final coordinates with respect to the cathod in the last column of the table.
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