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TY - CONF AU - Potts, R.E. AU - Blokland, W. AU - Cousineau, S.M. AU - Holmes, J.A. ED - Eshraqi, Mohammad ED - Trahern, Garry ED - Schaa, Volker RW TI - Observations of Coupling During Accumulation Using a Non-Destructive Electron Scanner in the Spallation Neutron Source Accumulator Ring 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 - An electron scanner has been installed in the accumulator ring of the Spallation Neutron Source (SNS). The non-destructive device permits turn-by-turn measurements of the horizontal and vertical profiles of the proton beam during accumulation with fine longitudinal resolution. In this study the device is used to identify the source of transverse coupling in the SNS ring and to understand the impact of space charge on the evolution of the coupled beam. We present experimental observations of coupling dependent on tune, injected intensity, and accumulated intensity for a simplified accumulation scenario with no RF and no injection painting. We also investigate the effects of varying the skew quadrupoles and tune for beams with the SNS production-style ring injection and ring RF patterns. PB - JACoW CP - Geneva, Switzerland SP - 351 EP - 356 KW - electron KW - coupling KW - experiment KW - accumulation KW - quadrupole DA - 2016/08 PY - 2016 SN - 978-3-95450-185-4 DO - 10.18429/JACoW-HB2016-TUPM9Y01 UR - http://jacow.org/hb2016/papers/tupm9y01.pdf ER -