Tests of Fermilab built 40 mm aperture full length SSC dipole magnets

Several 40 mm aperture, 17 m long dipoles have been built by Fermilab as developmental prototypes for the Superconducting Super Collider. These magnets differ from those manufactured at Brookhaven National Laboratory in that they have an external inner-outer coil splice design, a collet style end clamp assembly, a new, analytically designed minimum stress coil end design, and a new insulation system which does not employ shims or shoes''. In addition, the magnets were built using production-style tooling. The magnets were tested at the Fermilab Magnet Testing Facility. Quench testing and mechanical measurement results are presented and analyzed with emphasis on the new design and fabrication features of these magnets. 13 refs., 5 figs

Measurement of internal forces in superconducting accelerator magnets with strain gauge transducers

An improved method has been developed for the measurement of internal forces in superconducting accelerator magnets, in particular the compressive stresses in coils and the end restraint forces on the coils. The transducers have been designed to provide improved sensitivity to purely mechanical strain by using bending mode deflections for sensing the applied loads. Strain gauge resistance measurements are made with a new system that eliminates sources of errors due to spurious resistance changes in interconnecting wiring and solder joints. The design of the transducers and their measurement system is presented along with a discussion of the method of compensation for thermal and magnetic effects, methods of calibration with typical calibration data, and measured effect in actual magnets of the thermal stress changes from cooldown and the Lorentz forces during magnet excitation. 13 figs., 1 tab

Superconducting magnet designs for the SSC and RHIC

This paper reviews the main dipoles for RHIC, which are 9.7 meters long with an operating field of 3.45 T. Four full size dipoles have been tested and all exceeded the operating field. The main dipoles for the SSC project are 17 meters in length with an operating field of 6.6 T. Five of these have been tested. Rough calculations show that the possibility of operating future such large colliders at approx. 80 K instead of approx. 4 K is unlikely to have a major impact upon their cost or feasibility. However, increasing the critical field of practical superconductors (either by lowering the operating temperature of further conductor development) could have a major impact upon the specialized magnets used in the intersection regions of such machines