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TY - CONF AU - Skripka, G. AU - Andersson, Å. AU - Cullinan, F.J. AU - Mitrovic, A.M. AU - Nagaoka, R. AU - Tavares, P.F. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Commissioning of the Harmonic Cavities in the MAX IV 3 GeV Ring J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - The MAX IV 3 GeV storage ring operates with beam of high current and ultralow emittance. These beam parameters in combination with the small effective aperture enhance possible collective beam instabilities. Three passive harmonic cavities are installed to introduce bunch lengthening and tune spread, leading to decoupling of the bunch spectrum from the machine effective impedance and mitigating instabilities by Landau damping respectively. In this paper we present the first results of the commissioning of the passive third harmonic cavities in the MAX IV 3 GeV ring. The additional harmonic cavity potential significantly improved the beam lifetime. First observations of the harmonic cavity effect on the damping of collective beam instabilities are discussed. PB - JACoW CP - Geneva, Switzerland SP - 2911 EP - 2913 KW - cavity KW - damping KW - resonance KW - storage-ring KW - synchrotron DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-WEPOW035 UR - http://jacow.org/ipac2016/papers/wepow035.pdf ER -