In the research and development program for the Large Hadron Collider (LHC) project at CERN the construction of superconducting dipole magnets with a twin aperture plays an important role. The design value of the magnetic field produced by these magnets is 10 T at superfluid helium temperatures below 2 K. One of the 1-m-long model magnets in the program has been built by HOLEC. The behavior of this magnet under cryogenic conditions has been investigated twice: first, after the collaring of the superconducting coils had been completed and, second, after the completion of the magnet, i.e., after assembling the iron yoke and aluminum shrinking cylinder. This procedure has made possible a study of the influence of the iron yoke and shrinking cylinder on the training behavior of the magnet. The test results of this model magnet show that the design value of the magnetic field is feasible and that the mechanical structure can withstand the forces.
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