Magnetic Measurements of a Full-Scale Prototype of the HL-LHC Beam Separation Dipole

High Energy Research Organization (KEK) has engaged in development of the beam separation dipole, MBXF, toward the HL-LHC project. The magnet has a full length of 7 m and generates a magnetic field of 5.6 T in the magnet center at nominal operating condition of 12kAand 1.9 K. Optimization of the magnetic model is performed through two and three dimensional studies and iterated until resultant field quality is within required tolerance. Field quality of the first full-scale prototype of MBXF (a.k.a. MBXFP1) is measured first at room temperature on the premises of the manufacturer, Hitachi Ltd. This result is used for comparison with the numerical models and the first validation of our design methodology. After then a further model tuning is considered for the magnetic design of the first series. The final validation of our design methodology is performed after the cold test ofMBXFP1in the vertical cryostat inKEKfacilities. Finally we determine a magnetic design of the first series production with an expected sextupole integral and decapole integral, which aremajor systematic contributions to the field quality ofMBXF, estimated to be 0.0 +/- 1.6 units and 1.1 +/- 0.2 units, respectively.