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TY - CONF AU - Amorim, D. AU - Antipov, S. A. AU - Biancacci, N. AU - Buffat, X. AU - Carver, L.R. AU - Métral, E. ED - Schaa, Volker RW TI - Simulation and Measurement of the TMCI Threshold in the LHC J2 - Proc. of HB2018, Daejeon, Korea, 17-22 June 2018 C1 - Daejeon, Korea T2 - ICFA Advanced Beam Dynamics Workshop T3 - 61 LA - english AB - The transverse mode coupling instability occurs in individual bunches when two transverse oscillation modes couple at high intensity. Simulations predict an instability threshold in the LHC at a single bunch intensity of 3*10¹¹ protons. The TMCI threshold can be inferred by measuring the tune shift as a function of intensity. This measurement was performed in the LHC for different machine impedances and bunch intensities. The impedance was changed by varying the primary and secondary collimators gaps to increase their contribution to the resistive wall impedance. The experiment also allowed to assess the validity of the LHC impedance model in the single bunch case. PB - JACoW Publishing CP - Geneva, Switzerland SP - 43 EP - 47 KW - impedance KW - simulation KW - coupling KW - operation KW - synchrotron DA - 2018/07 PY - 2018 SN - 978-3-95450-202-8 DO - 10.18429/JACoW-HB2018-MOP2WA05 UR - http://jacow.org/hb2018/papers/mop2wa05.pdf ER -