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 field profile. Field magnitude, gradient and oscillations must all be controlled along the /spl sim/27 meter curved beamline to allow for optimal capture of /spl pi/ and /spl mu/ particles, the sign and momentum selection of appropriate /spl mu/ particles, and their transport to the detector region. The solenoid system is designed to yield the required field profile in an efficient and cost-effective manner. A critical concern is the removal of field gradient reversals along the beamline. The system is decomposed into a large number of simple solenoids of equal current density, whose dimensions vary so as to obtain the required field contribution. Analysis of the field influence of cosmic ray shielding is provided, along with the field footprint of the entire system. Structural aspects are discussed, in particular relating to magnetic forces and cryostat requirements.