Test of New Accelerator Superconducting Dipoles Suitable for High Precision Field

Field homogeneity of superconducting dipoles for accelerators is still difficult to achieve. To reach the required homogeneity level of 10-4 the conductors must be located within a few hundreths of mm. At present all the superconducting machines in construction or in project use the most developed technique of the double shell configuration. This technique is very sensitive to conductor size and a great care must be taken to reach the needed field homogeneity. The design proposed in this paper is a current block configuration which uses accuratly punched laminations with slots for conductor location. The design is then much less sensitive to conductor size. Furthermore the tooling needed to build such magnets is much less expensive than the one needed for the shell design. Three short dipoles have been constructed and tested. Very good results in field homogeneity have been obtained directly from the original design.