A superconducting cos 2 theta quadrupole design for the CEBAF high resolution spectrometer

The pair of high-resolution spectrometers at CEBAF (Continuous Electron Beam Accelerator Facility) require large-aperture, high-gradient quadrupoles. A superconducting cos 2 theta design is under consideration to meet these requirements. The quadrupole has a coil diameter of 1 m and a peak gradient of 5 T/m with an effective field length of 1.8 m. The stored energy of this quad is 3.0 MJ. The details of the design of the coil, shrink fit support collar, and cryostat are presented. The analysis of the superconductor, quench behavior, and coil protection system is covered. >