Field Quality Optimization in the Common Coil Design (Magnet Ends)
Up-down asymmetry gives large skew harmonics if done nothing. Integrate By.dl 10 mm above and 10 mm below midplane.
Up-down asymmetry can be compensated with end spacers. One spacer is used below to match integral By.dl 10 mm above & below midplane.
Proof of principle that it can be removed
An up-down asymmetry in the ends with “no spacer”
Computer code ROXIE (developed at CERN) will be used to efficiently optimize accelerator quality magnet design.
Young Post-doc (Suitbert Ramberger).
A large Bz.dl in two ends (~1 T.m in 15 T magnet).
- Lead end of one magnet + Return of the next magnet will make it cancel in about ~1meter (cell length ~200 meters).