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TY - CONF AU - Ohnishi, Y. AU - Biagini, M.E. AU - Boscolo, M. AU - Carmignani, N. AU - Funakoshi, Y. AU - Guiducci, S. AU - Koiso, H. AU - Liuzzo, S.M. AU - Morita, A. AU - Ohmi, K. AU - Oide, K. AU - Sugimoto, H. AU - Zhou, D. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Optics Measurements and Corrections at the Early Commissioning of SuperKEKB J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - We present experimental results of measurements and corrections of the optics at the early Phase-1 commissioning of SuperKEKB which is a positron-electron collider built to achieve the target luminosity of 8x10³⁵ cm⁻²s⁻¹. We have three stages; the Phase-1 is the commissioning of the machine without the final focus magnets and detector solenoid(no collision); the collision with the final focus system and the Belle II detector will be performed at the Phase-2 and Phase-3. The strategy for the luminosity upgrade is a novel "nano-beam'' scheme found elsewhere*. In order to achieve the target luminosity, the vertical emittance has to be reduced by corrections of machine error measured by orbit responses. The vertical emittance should be achieved to be less than 6 pm(0.2 % coupling) during the Phase-1 by fully utilizing correction tools of skew quadrupole-like coils wound on sextupole magnets and power supplies for each correction coil in quadrupole magnets. In addition to the linear optics, the optics for off-momentum particles is also studied to understand a dynamic aperture affects the Touschek lifetime. PB - JACoW CP - Geneva, Switzerland SP - 3782 EP - 3784 KW - coupling KW - sextupole KW - optics KW - quadrupole KW - emittance DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-THPOR007 UR - http://jacow.org/ipac2016/papers/thpor007.pdf ER -