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).

• Is it a problem?

• Examine AP issues.

• Zero integral.

• Lead end of one magnet + Return of the next magnet will make it cancel in about ~1meter (cell length ~200 meters).

• Small v X B.

Previous slide

Next slide

Back to first slide

View graphic version