Finite element analysis of the QC quadrupole magnet for the Superconducting Super Collider

The Superconducting Super Collider project will require the construction of nearly 9400 magnets of which 1800 are quadrupoles each 4.32 m long. These magnets use niobium-titanium superconducting cables with a current of 6500 A/turn to get a high magnetic field gradient and focalize the particles beam. After the QA and QB quadruples, a new quadrupole, called QC, has been conceived. It is a 4 cm bore accelerator type, with a new collar design and a field gradient of 214 T/m that is lower than the one in QA. The new collar design consists mainly in a two pieces symmetrical and thicker collar which provides a complete support to the coils. This paper will analyze the magnetic field and the stress and strain distribution. The results show that this collar is a big improvement over the previous, especially in terms of stiffness, which is not explained only by the thicker collar but also by a different pole angle. 4 refs