DESIGN AND FABRICATION OF A HIGH-ASPECT-RATIO CABLE FOR A HIGH-GRADIENT QUADRUPOLE MAGNET

The Large Hadron Collider interaction regions require quadrupoles with a 70 mm diameter bore, a gradient of 250 T/m, and good cooling so tha t the magnets can operate in a high radiation background without quenc hing. In order to meet these stringent requirements, a two-layer magne t with a high aspect ratio cable has been designed. This cable utilize s the SSC inner and outer layer strands, which have been optimized and are available in large quantities. The initial design parameters for both cables are 15.2 mm width; the inner cable has 38 strands of 0.8 m m diam wire and a keystone angle of 0.99 deg. The outer cable has 46 s trands of 0.65 mm diam wire and a keystone angle of 0.69 deg. These ca bles have been fabricated and then subjected to a number of tests to i nsure their performance in the quadrupole. These test results, includi ng model coil winding studies, electrical property measurements, and m echanical property measurements will be presented.