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TY - CONF AU - Biancacci, N. AU - Bartosik, H. AU - Huschauer, A. AU - Migliorati, M. AU - Métral, E. AU - Rijoff, T.L. AU - Salvant, B. AU - Scrivens, R. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - LEIR Impedance Model and Coherent Beam Instability Observations J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 LA - english AB - The LEIR machine is the first synchrotron in the ion acceleration chain at CERN and it is responsible to deliver high intensity ion beams to the LHC. Following the recent progress in the understanding of the intensity limitations, detailed studies of the machine impedance started. In this work we describe the present LEIR impedance model, detailing the contribution to the total longitudinal and transverse impedance of several machine element. We then compare the machine tune shift versus intensity predictions against measurements at injection energy and summarize the coherent instability observations in absence of transverse damper feedback. PB - JACoW CP - Geneva, Switzerland SP - 3159 EP - 3162 KW - impedance KW - ion KW - injection KW - space-charge KW - electron DA - 2017/05 PY - 2017 SN - 978-3-95450-182-3 DO - 10.18429/JACoW-IPAC2017-WEPIK094 UR - http://jacow.org/ipac2017/papers/wepik094.pdf ER -