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TY - CONF AU - Dowd, R.T. AU - Atkinson, M.P. AU - Boland, M.J. AU - LeBlanc, G. AU - Tan, Y.E. AU - Teytelman, D. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Investigation of Trapped Resonant Modes in Insertion Devices at the Australian Synchrotron J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - The Australian Synchrotron light Source has 3 variable gap in-vacuum undulators (IVU) in the storage ring. Since installation, these devices have been the source of strong beam instabilities. These instabilities seem to behave as trapped resonant modes of very high Q and high frequency, although a definite source has not been identified. The presence of these instabilities has necessitated operating at unusually high chromaticity for much of the light source's operations. More recently transverse feedback has been able to control the instabilities and recent developments in diagnostics have allowed some investigation of the frequency and mode response of these resonances. The results of this investigation will be presented in this paper. PB - JACoW CP - Geneva, Switzerland SP - 1710 EP - 1713 KW - resonance KW - feedback KW - vacuum KW - undulator KW - synchrotron DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-TUPOR023 UR - http://jacow.org/ipac2016/papers/tupor023.pdf ER -