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TY - CONF AU - Papash, A.I. AU - Blomley, E. AU - Brosi, M. AU - Gethmann, J. AU - Kehrer, B. AU - Müller, A.-S. AU - Schuh, M. AU - Schönfeldt, P. AU - Steinmann, J.L. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Non-Linear Optics and Low Alpha Operation at the Storage Ring KARA at KIT J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - The storage ring Karlsruhe Research Accelerator (KARA) at KIT operate in a wide energy range from 0.5 to 2.5 GeV. Different non-linear effects, in particular, residual octupole components of the magnetic field of the CATACT wiggler at high field level (2.5 T), proximity of the working point to a vertical sextupole resonance Qy=8/3 and weak coupling octupole resonance 2Qx+2Qy=19, high chromaticity, etc. decrease the beam life time. This is because of the reduced dynamic aperture and momentum acceptance for off-momentum particles. A new operation point at high vertical tune Qy=2.81 was tested. For this, injection and ramping tables have been modified. First the values were optimized by simulations, then during beam tests, to minimize betatron tune shaking during beam-energy ramps. It stabilized high-current beams by the fast-feedback system the whole process: injection at 0.5 GeV, ramping, and operation at 1.3 GeV cycles. It essentially improved life time and beam current. In addition, new low-alpha tables have been created and tested, resulting in the reduction of the momentum compaction factor to 10⁻⁴. Short bunch operation at 0.5GeV injection energy was also tested successfully. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4235 EP - 4238 KW - wiggler KW - operation KW - octupole KW - resonance KW - injection DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPMF070 UR - http://jacow.org/ipac2018/papers/thpmf070.pdf ER -