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TY - CONF AU - Goddard, B. AU - Balhan, B. AU - Barna, D. AU - Borburgh, J.C.C.M. AU - Fraser, M.A. AU - Jorat, L.O. AU - Kain, V. AU - Lolliot, C. AU - Nagaslaev, V.P. AU - Stoel, L.S. AU - Van Trappen, P. AU - Velotti, F.M. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Optimization of Diffuser (Pre-Scatterer) Configurations for Slow Extraction Loss Reduction at Electrostatic Septa 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 - Uncontrolled beam loss at the electrostatic septum is a performance limit for several existing or planned high power hadron accelerators delivering slow-extracted spills to fixed targets. A passive diffuser, or pre-scatterer, in a suitable configuration has been shown to reduce such beamloss significantly, with the actual gain factor depending on the parameters and details of the extraction process and hardware. In this paper, the optimization of diffuser configurations is investigated for a range of beam energies and extraction conditions, and the sensitivity to the available parameters explored via simulation results. The advantages and limitations of the diffuser are discussed and conclusions drawn concerning the specific case studies of the 8 GeV Fermilab debuncher ring and 400 GeV CERN SPS. PB - JACoW Publishing CP - Geneva, Switzerland SP - 830 EP - 833 KW - septum KW - scattering KW - extraction KW - simulation KW - proton DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-TUPAF053 UR - http://jacow.org/ipac2018/papers/tupaf053.pdf ER -