Solenoid (CLAS12 Detector)

The CLAS12 detector includes a 5T solenoid field. The strength of this magnetic field is required for a dynamically polarized solid-state target. At the same time, the solenoid field is needed for particle tracking and momentum analysis by using high-resolution tracking detectors to measure the trajectories of charged particles in the field.

Layout
The solenoid includes:
 * A large opening for charged and neutral particles in the forward hemisphere. This opening will have a polar angle of up to ±40o.
 * A momentum range from 0.3 to 1.3 GeV and  a limited radial space for polar angles from 35o to 125o and momentum range. This will allow for optimal charged particle momentum resolution.
 * High-luminosity operation, the solenoid field offers an effective shield of the sensitive tracking detectors and guides them into areas where they can dump their energy in specially designed tungsten absorbers.
 * The operation of a highly polarized target.
 * Compensation of the solenoid magnetic field.

Links/Sources
CLAS12 Superconducting Magnets: http://www.jlab.org/Hall-B/clas12-web/subsystems/magnets-intro.html