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TY - CONF AU - Schenk, M. AU - Buffat, X. AU - Carver, L.R. AU - Li, K.S.B. AU - Maillard, A. AU - Métral, E. ED - Schaa, Volker RW TI - Experiments and Theory on Beam Stabilization with Second-Order Chromaticity J2 - Proc. of HB2018, Daejeon, Korea, 17-22 June 2018 C1 - Daejeon, Korea T2 - ICFA Advanced Beam Dynamics Workshop T3 - 61 LA - english AB - This study reports on an alternative method to generate transverse Landau damping to suppress coherent instabilities in circular accelerators. The incoherent betatron tune spread can be produced through detuning with longitudinal rather than transverse action. This approach is motivated by the high-brightness, low transverse emittance beams in future colliders where detuning with transverse amplitude will be less effective. Detuning with longitudinal action can be introduced with a radio frequency (rf) quadrupole, or similarly, using second-order chromaticity. The latter was enhanced in the Large Hadron Collider (LHC) at CERN and experimental results on single-bunch stabilization are briefly recapped. The observations are interpreted analytically by extending the Vlasov formalism to include nonlinear chromaticity. Finally, the newly developed theory is benchmarked against circulant matrix and particle tracking models. PB - JACoW Publishing CP - Geneva, Switzerland SP - 32 EP - 37 KW - impedance KW - damping KW - experiment KW - betatron KW - simulation DA - 2018/07 PY - 2018 SN - 978-3-95450-202-8 DO - 10.18429/JACoW-HB2018-MOP2WA03 UR - http://jacow.org/hb2018/papers/mop2wa03.pdf ER -