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TY - UNPB AU - Li, C. AU - Jameson, R.A. AU - Liu, Zh.C. AU - Qin, Q. ED - Eshraqi, Mohammad ED - Trahern, Garry ED - Schaa, Volker RW TI - Collective Beam Instability and Beam Halo Due to Space Charge J2 - Proc. of HB2016, Malmö, Sweden, July 3-8, 2016 C1 - Malmö, Sweden T2 - ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams T3 - 57 LA - english AB - The collective mode instability in high intensity ion beam induced by space charge has been studied for several decades. Beam halo also will be formed if beam is located in the collective mode unstable stop band. In this paper, firstly we clearly show that the beam surface is distorted by the space charge potential perturbation; the formed n-fold structure is in particular to the nth order unstable collective mode. Secondly, the formed n-fold structure will lead to beam halo with beam evolution. The halo mechanism could be depicted by resonance between single particle and oscillation collective mode. Finally, we proved that the halo particles are those whose actions were modified significantly by the nonlinear space charge and resonance. PB - JACoW CP - Geneva, Switzerland ER -