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TY - CONF AU - Velotti, F.M. AU - Bartosik, H. AU - Buzio, M.C.L. AU - Cornelis, K. AU - Di Capua, V. AU - Fraser, M.A. AU - Goddard, B. AU - Kain, V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Characterisation of SPS Slow Extraction Spill Quality Degradation J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The main physics users of the Super Proton Synchrotron (SPS) are the experiments installed in the North Area (NA). They are supplied with slowly extracted protons or heavy ions, exploiting a third integer slow extraction to provide a 4.8 s spill. High duty cycle and constant particle flux are the main requirements. Frequent super cycle changes induce variation of the spill macro structure which directly deteriorate the final spill quality. In this paper, the source of such an effect are investigated. Results of both beam based measurements and direct magnetic measurements on the SPS reference magnets are presented. Finally, a possible strategy to counteract this effect is discussed, in order to try to remove the super cycle changes variation as cause for spill quality deterioration. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2403 EP - 2405 KW - quadrupole KW - dipole KW - flattop KW - target KW - extraction DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPMP034 UR - http://jacow.org/ipac2019/papers/wepmp034.pdf ER -