Abstract
Following a successful commissioning period, the multiturn 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 nonlinear 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 nonlinear optics, which was required due to the installation of a dummy septum to reduce the activation of the magnetic extraction septum. This paper focuses on these key features including the use of the transverse damper and the septum shadowing, which allowed a transition from the MTE study to a mature operational extraction scheme.
Highlights
To provide high-intensity beams for fixed-target physics at the Super Proton Synchrotron (SPS), the longitudinal structure delivered by the Proton Synchrotron (PS) has to comply with certain requirements
The efforts dedicated to the study and the implementation of the multiturn extraction (MTE) technique in the PS have been rewarded by its first use in routine operation, which started in the second half of the 2015 SPS physics run
Ripple effects generated by the power converters controlling the special coils installed in the PS main magnets have been proven to be the main source of the time-variation of the MTE efficiency
Summary
Ion Beam Applications, BE 1348 Louvain-la-Neuve, Belgium (Received 12 March 2017; published 14 June 2017). Following a successful commissioning period, the multiturn 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 longserving continuous transfer (CT) extraction, which has the drawback of inducing high activation in the ring. 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 nonlinear optics, which was required due to the installation of a dummy septum to reduce the activation of the magnetic extraction septum. This paper focuses on these key features including the use of the transverse damper and the septum shadowing, which allowed a transition from the MTE study to a mature operational extraction scheme
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