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Article
Report number	CERN-ACC-2016-0100
Title	Transverse beam splitting made operational: Recent progress of the multi-turn extraction at the CERN proton synchrotron
Author(s)	Huschauer, Alexander (CERN) ; Borburgh, Jan (CERN) ; Damjanovic, Sanja (CERN) ; Gilardoni, Simone (CERN) ; Giovannozzi, Massimo (CERN) ; Hourican, Michael (CERN) ; Kahle, Karsten (CERN) ; Michels, Olivier (CERN) ; Sterbini, Guido (CERN) ; Hernalsteens, Cedric (CERN ; IBA, Louvain-la-Neuve) ; Le Godec, Gilles (CERN)
Publication	2016
Imprint	20 Jul 2016
Number of pages	6
In:	57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.MOPR009
DOI	10.18429/JACoW-HB2016-MOPR009
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN PS
Project	CERN MTE
Free keywords	PS ; Multi-Turn Extraction ; Non-linear beam dynamics ; Beam loss ; Septum ; Shadowing ; PTC ; PyORBIT
Abstract	Following a successful commissioning period, the Multi-Turn Extraction (MTE) at the CERN Proton Synchrotron (PS) has been applied for the fixed-target physics programme at the Super Proton Synchrotron (SPS) since September 2015. This exceptional extraction technique was proposed to replace the long-serving Continuous Transfer (CT) extraction, which has the drawback of inducing high activation in the ring. MTE exploits the principles of non-linear beam dynamics to perform loss-free beam splitting in the horizontal phase space. Over multiple turns, the resulting beamlets are then transferred to the downstream accelerator. The operational deployment of MTE was rendered possible by the full understanding and mitigation of different hardware limitations and by redesigning the extraction trajectories and non-linear optics, which was required due to the installation of a dummy septum to reduce the activation of the magnetic extraction septum. The results of the related experimental and simulation studies, a summary of the 2015 performance analysis, as well as more recent performance improvements are presented in this paper.
Copyright/License	CC-BY-3.0

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