Beam life time studies and design optimization of the Ultra-low energy Storage Ring
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Beam life time studies and design optimization of the Ultra-low energy Storage Ring C. P. Welsch · A. I. Papash · J. Harasimowicz · O. Karamyshev · G. A. Karamysheva · D. Newton · M. Panniello · M. Putignano · M. R. F. Siggel-King · A. Smirnov
© Springer International Publishing Switzerland 2014
Abstract The Ultra-low energy electrostatic Storage Ring (USR) at the future Facility for Low-energy Antiproton and Ion Research (FLAIR) will provide cooled beams of antiprotons in the energy range between 300 keV down to 20 keV. Based on the original design concept developed in 2005, the USR has been completely redesigned over the past few years by the QUASAR Group. The ring structure is now based on a ’split achromat’ lattice. This ensures compact ring dimensions of 10 m × 10 m, whilst allowing both, in-ring experiments with gas jet targets and studies with extracted beams. In the USR, a wide range of beam parameters shall be provided, ranging from very short pulses in the nanosecond regime to a coasting beam. In addition, a combined fast and slow extraction scheme will be featured that allows for providing external experiments with cooled beams of different time structure. Detailed investigations into the dynamics of low energy beams, including studies into the long term beam dynamics and ion kinetics, beam life time, equilibrium momentum spread and equilibrium lateral spread during collisions with an internal target were carried out. This required the development of new simulation tools to further the understanding of beam storage with electrostatic fields. In addition, studies into beam diagnostics methods for the monitoring of ultra-low energy ions at beam intensities less than 106 were carried out. This includes instrumentation for the early commissioning of the machine, as well as for later operation with antiprotons. In this paper, on overview of the technical design of the USR is given with emphasis on two of the most important operating modes, long term beam dynamics and the design of the beam diagnostics system. Keywords Storage Ring · Low energy beam · Antiprotons · Life time · Beam diagnostics Proceedings of the 11th International Conference on Low Energy Antiproton Physics (LEAP 2013) held in Uppsala, Sweden, 10–15 June, 2013 C. P. Welsch () · J. Harasimowicz · O. Karamyshev · D. Newton · M. Putignano · M. R. F. Siggel-King Cockcroft Institute, The University of Liverpool, Liverpool, UK e-mail: [email protected] A. I. Papash · G. A. Karamysheva · M. Panniello · A. Smirnov Max Planck Institute for Nuclear Physics, Heidelberg, Germany
C.P. Welsch et al.
1 Introduction Currently, the Antiproton Decelerator (AD) at CERN is the only place in the world where physics with low-energy antiprotons can be pursued [1]. This facility has been in operation since 2000 and, although the experiments at the AD have produced an impressive number of widely published and recognized results, such as storage of antihydrogen in traps for extended periods [2], they are finally limited by the relatively low intensity of antip
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