Preliminary design of the MECO magnet system

The Muon-Electron Conversion experiment, to be built at Brookhaven National Laboratory, requires a complex set of solenoids to generate the required f ield profile. Field magnitude, gradient and oscillations must all be contro lled along the similar to 27 meter curved beamline to allow for optimal cap ture of pi and mu particles, the sign and momentum selection of appropriate mu particles, and their transport to the detector region. The solenoid sys tem is designed to yield the required field profile in an efficient and cos t-effective manner. A critical concern is the removal of field gradient rev ersals along the beamline. The system is decomposed into a large number of simple solenoids of equal current density, whose dimensions vary so as to o btain the required field contribution. Analysis of the field influence of c osmic ray shielding is provided, along with the field footprint of the enti re system, Structural aspects are discussed, in particular relating to magn etic forces and cryostat requirements.