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TY - CONF AU - Arimoto, Y. AU - Iwasaki, M. AU - Ohuchi, N. AU - Tsuchiya, K. AU - Wang, X. AU - Yamaoka, H. AU - Zong, Z.G. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Magnetic Measurement for Superconducting-Quadrupole-Magnets of Final-Focus System for SuperKEKB J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - SuperKEKB is an upgrade project of KEKB to increase its luminosity to 8 x 10³⁵ cm⁻² s⁻¹ based on the nano-beam scheme. In SuperKEKB, one of a key element is a final-focus system; it reduces e⁻/e⁺ beam size to 50 nm in vertical and 10 μm in horizontal direction at an interaction point (IP). The system consists of eight superconducting quadrupole magnets and four quadrupoles are aligned on the each beam line. The quadrupole, QC1P(QC1E), which is located at the closest position to the IP on the e⁺(e⁻) beam line, generates a field gradient of about 70 T/m. An inner diameter of coil and a magnetic length for QC1P(QC1E) are 25(33) mm and 334(373) mm, respectively. The production of all quadrupole magnets are completed. To confirm their field qualities, we performed magnetic measurement for each magnet in advance to be integrated into cryostats on the beam lines. In the measurement, the quadrupoles were cooled down to 4.2 K in a test vertical cryostat and field harmonic components were measured with harmonic coils. The magnitude of error multipole components for all magnets met requirements from beam optics design. In this paper we describe the measurement results. PB - JACoW CP - Geneva, Switzerland SP - 3771 EP - 3773 KW - quadrupole KW - sextupole KW - luminosity KW - octupole KW - radiation DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-THPOR004 UR - http://jacow.org/ipac2016/papers/thpor004.pdf ER -