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TY - CONF AU - Ohuchi, N. AU - Arimoto, Y. AU - Iwasaki, M. AU - Kawai, M.K. AU - Kondo, Y. AU - Makida, Y. AU - Tsuchiya, K. AU - Yamaoka, H. AU - Zong, Z.G. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Magnetic Field Measurement System for the SuperKEKB Final Focus Superconducting Magnets J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - SuperKEKB are now being constructed with a target luminosity of 8×1035 which is 40 times higher than KEKB. This luminosity can be achieved by the "Nano-Beam" scheme, in which both beams should be squeezed to about 50 nm at the beam interaction point, IP. The beam final focusing system consists of 8 superconducting quadrupole magnets, 4 superconducting solenoids and 43 superconducting corrector coils. The magnetic field measurement systems with the vertical cryostats were designed and constructed for performing the acceptance test of these magnets at 4 K. The field measurements are performed by the 6 different harmonic coils and a Hall probe. The higher order multi-pole field distributions along the magnet axes are very important for the beam operation, and then these distributions are measured with the 20 mm long harmonic coils. The integral fields of quadrupole magnets are measured with the 600 mm long harmonic coils. We will describe the magnetic field measurement system. PB - JACoW CP - Geneva, Switzerland SP - 2693 EP - 2695 KW - quadrupole KW - dipole KW - superconducting-magnet KW - luminosity KW - factory DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-WEPRI087 UR - http://jacow.org/ipac2014/papers/wepri087.pdf ER -