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Overview of Slow Extraction Progress & Development at CERN

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Rob Ainsworth
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Rob Ainsworth
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23 Jul 2019, 18:05
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23 Jul 2019, 18:05
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23 Jul 2019, 18:05
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Annual high intensity requests of over 1e19 protons on target (POT) from the CERN Super Proton Synchrotron (SPS) Fixed Target (FT) physics programme continue, with the prospect of requests for even higher, unprecedented levels in the coming decade. A concerted and multifaceted R&D effort has been launched to understand and reduce the slow extraction induced radioactivation of the SPS and to anticipate future experimental proposals, such as SHiP [1] at a future SPS Beam Dump Facility (BDF) [2], which will demand a several-fold increase in proton flux. The seminar will outline the operational improvements and recent advances that have been made to significantly reduce the slow extraction losses with the deployment of new extraction concepts, including passive and active (thin, bent crystal) diffusers and extraction on the third-integer resonance with octupoles. The progress made in improving the SPS reproducibility and spill quality will also be detailed before an outlook and implications for future SPS FT operation will be presented. References [1] A. Golutvin et al., A Facility to Search for Hidden Particles (SHiP) at the CERN SPS, Rep. No. CERN-SPSC-2015-016 (SPSC-P-350), CERN, Geneva, Switzerland, Apr. 2015. [2] M. Lamont et al., SPS Beam Dump Facility Comprehensive Design Study, Rep. No. CERN-PBC-REPORT-2018-001, CERN, Geneva, Switzerland, 11 Dec 2018.
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