Paper |
Title |
Page |
TUPRI018 |
Transition Energy Crossing in the Future FAIR SIS-100 for Proton Operation |
1591 |
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- S. Aumon, D. Ondreka, S. Sorge
GSI, Darmstadt, Germany
- K. Groß
TEMF, TU Darmstadt, Darmstadt, Germany
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The FAIR project foresees to deliver an intense single bunch beam with 2·1013 protons of 50ns duration to the experiments. Besides the original γt-shift scenario, an alternative RF proton cycle has been recently studied: the transition energy is crossed with possibly a gamma transition jump. The flexibility of the lattice allowing to change the value of γt, a transition crossing has been considered for two possible energies. This challenging scenario is limited by several constraints such as space charge, a small momentum acceptance and by the required RF manipulations aiming to produce the final single bunch beam in the future SIS-100. This paper focuses on how the high intensity beam would suffer of the mismatch in bunch length at transition and new sets of beam parameter are defined for the proton beam. The jump quadrupole system is also presented. The applicability of the foreseen longitudinal feedback system to cure quadrupolar oscillations is also discussed in this paper.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI018
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THPRO059 |
Simulation Study on Beam Loss in the Alpha Bucket Regime during SIS-100 Proton Operation |
3008 |
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- S. Sorge
GSI, Darmstadt, Germany
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Besides heavy ion operation, the heavy ion synchrotron SIS-100 will accelerate a single proton bunch of N=2*1013 particles up to the energy E=29 GeV. For the present standard scenario, optics settings have been developed which provide a transition energy according to gammatr=45.5 in order to avoid transition crossing during acceleration. At extraction energy the corresponding nonlinear momentum compaction and phase slip factors cause the formation of a so called alpha bucket. In this contribution we present the results of transverse beam loss tracking studies in the alpha bucket regime. The effects of momentum spread, magnet errors and residual closed orbit distortion are analyzed.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO059
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