The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Ohnishi, Y. AU - Koiso, H. AU - Morita, A. AU - Ohmi, K. AU - Oide, K. AU - Sugimoto, H. ED - Li, Ying-ying ED - Li, Lu ED - Schaa, Volker RW TI - Off-momentum Optics at SuperKEKB J2 - Proc. of eeFACT2018, Hong Kong, China, 24-27 September 2018 CY - Hong Kong, China T2 - ICFA ABDW on High Luminosity Circular e$^+$e$^-$ Colliders T3 - 62 LA - english AB - The nano-beam scheme can squeeze the vertical beta function at the IP much smaller than the bunch length. It implies that the large chromaticity is generated in the vicinity of the final focus quadrupole magnets and the strong sextupoles are adopted to correct the chromaticity, for instance the local chromaticity corrections. While understanding of the off-momentum optics is important to optimize the dynamic aperture to make Touschek lifetime long and to reduce the luminosity degradation due to chromatic behaviors. In general, there is a discrepancy between measurements and those obtained from the optics model. The chromatic phase-advance is introduced to measure the off-momentum optics and correct by using sextupole magnets. PB - JACoW Publishing CP - Geneva, Switzerland SP - 71 EP - 75 KW - sextupole KW - coupling KW - lattice KW - optics KW - dynamic-aperture DA - 2019/04 PY - 2019 SN - 978-3-95450-216-5 DO - DOI: 10.18429/JACoW-eeFACT2018-TUOBB02 UR - http://jacow.org/eefact2018/papers/tuobb02.pdf ER -