dBeta/dE vs sextupoles

October 14, 2003

Begin with the lattice bmad_6wig_lum_20030915_v1 that we have been using for cesr-c machine studies and design sextupoles to minimize dBeta/dE. The lattice with the new sextupoles is bmad_6wig_lum_20030915_v1_eopt.lat. It's properties include:

• tracking result
  • Electrons tracked with pretzel

• Qx=0.5341, Qy=0.5797, chrom_x=2.2, chrom_y=1.3, electrons
• dBeta/dE
  • The plot is mislabeled. Horizontal dBeta/dE is the top graph. Vertical is the bottom graph.

• lattice file
• lattice functions
• constraints
  • The large electron positron asymmetry is the result of the sextupoles

For reference, here is the corresponding data for the original design sextupoles in lattice bmad_6wig_20030915_v1:

• Qx=0.5303, Qy=3.45, chrom_x=1.0089, chrom_y=3.45
• dBeta/dE
• lattice functions
• constraints
• tracking result
  • positrons