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TY - CONF AU - Zang, L. AU - Akemoto, M. AU - Fukuda, S. AU - Furukawa, K. AU - Higo, T. AU - Iida, N. AU - Kakihara, K. AU - Kamitani, T. AU - Miura, T. AU - Miyahara, F. AU - Ogawa, Y. AU - Someya, H. AU - Takatomi, T. AU - Ushimoto, S. AU - Yokoyama, K. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Positron Yield Optimization by Adjusting the Components Offset and Orientation J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - In order to keep high luminosity beam collision condition at SuperKEKB, low emittance electron/positron injection and flexible pulse-to-pulse switching of these beam modes are essential requirements. While a primary electron beam strikes on a target to generate positrons, an injection electron beam passes through a small hole besides the target. Since the injection electron orbit should be on axis to avoid emittance growth, the target and the flux concentrator for positron focusing have a few millimeters offset from the axis. This offset positron generation gives significant degradation in the positron yield. In this paper, we will discuss positron yield improvement by proper orientation of the cut-in slit of the flux concentrator which yields un-symmetric field distribution and primary electron incident point. With particle tracking simulation taking three dimensional field distribution into account, an ideal positron trajectory giving optimum yield was found. PB - JACoW CP - Geneva, Switzerland SP - 576 EP - 578 KW - positron KW - target KW - electron KW - injection KW - simulation DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-MOPRI003 UR - http://jacow.org/ipac2014/papers/mopri003.pdf ER -