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TY - CONF AU - Timko, H. AU - Argyropoulos, T. AU - Karpov, I. AU - Shaposhnikova, E.N. ED - Schaa, Volker RW TI - Beam Instabilities After Injection to 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 - Long-lasting phase oscillations have been observed at injection into the LHC since its first start-up with beam. These oscillations, however, were not leading to noticeable losses or blow-up in operation, and were therefore not studied in detail. In 2017, dedicated measurements with high-intensity bunches revealed that oscillations can lead to losses even slightly below the baseline intensity for the high-luminosity upgrade of the LHC. For the first time, high-resolution bunch profile acquisitions were triggered directly at injection and the formation of large-amplitude non-rigid dipole oscillations was observed on a turn-by-turn basis. First simulations can reproduce this instability via bunch filamentation that takes place after injection, depending on the mismatch between the bunch and bucket size in momentum at injection. PB - JACoW Publishing CP - Geneva, Switzerland SP - 163 EP - 167 KW - injection KW - simulation KW - emittance KW - controls KW - operation DA - 2018/07 PY - 2018 SN - 978-3-95450-202-8 DO - 10.18429/JACoW-HB2018-TUP1WA03 UR - http://jacow.org/hb2018/papers/tup1wa03.pdf ER -