Single wiggler lattice

January 15, 2003 Lattice: ~dlr/bmad_devel/single_wig/bmad_1885mev_1wig_s1_19.lat

Single wiggler at 14e. Optics and orbits based on fitted wiggler fields (wiggler transfer function) Differences in beta and alpha at IP and in emittance and partition numbers minimized

• lattice constraints
• Optical parameters and orbits
  • table
  • png

January 21, 2003 Lattice: ~dlr/bmad_devel/single_wig/bmad_1885mev_1wig_s2.lat

Second iteration of single wiggler lattice. Wiggler at 14e. Optics and orbits based on fitted wiggler fields (wiggler transfer function) Differences in beta and alpha at IP and in emittance and partition numbers minimized. (Note that I just discovered that the wiggler map gives a 50microradian kick for the on axis beam. A new lattice called ~dlr/bmad_devel/single_wig/bmad_1885mev_1wig_s4.lat has the kick compensated.)

• lattice constraints
• Optical parameters and orbits
  • table
  • png
• Dynamic aperture tracking, 1000 turns da

• All quads 3-30 are varied independently east and west.
• All quads 30-49 are east west symmetric
• IR is always east west symmetric
• Separators at 45 are east west symmetric, those at 8 are not
• The initial quad optimization was done with east west symmetric sextupoles
• An attempt to include sextupoles along with the quads in the optimization, allowing those south of about 20 to be asymmetric was not particularly successful. The linear parameters improved but the dynamic aperture was not good.
• The apparently more successful strategy was to optimize sextupoles independently according to the standard procedure. This time the constraint on east west symmetry was relaxed. Then return to quad optimization and iterate.