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TY - CONF AU - Velotti, F.M. AU - Bartosik, H. AU - Cornelis, K. AU - Fraser, M.A. AU - Goddard, B. AU - Hirlaender, S. AU - Kain, V. AU - Michels, O. AU - Pari, M. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Observations of SPS Slow-Extracted Spill Quality Degradation and Possible Improvements J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - The SPS delivers slow extracted proton and heavy ion spills of several seconds to the North Area fixed target experiments with a very high duty factor. Reduced machine reproducibility due to magnetic history and power supply ripples on the main circuits lead however to frequent degradation of the spill duty factor. In this paper, the measured effect of the SPS magnetic history on spill quality and principal machine parameters is presented. Another detailed measurement campaign was aimed at characterising the frequency content and response of the spill to noise on the main power supplies ripples. The main findings of this study will also be reported. Finally, simulations of possible improvements based on the data acquired are discussed, as well as an extrapolation to the possible spill quality after the implementation of the improvements. PB - JACoW Publishing CP - Geneva, Switzerland SP - 761 EP - 764 KW - extraction KW - quadrupole KW - power-supply KW - simulation KW - experiment DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-TUPAF035 UR - http://jacow.org/ipac2018/papers/tupaf035.pdf ER -