Transition Energy Crossing in the Future FAIR SIS-100 for Proton Operation

This is the authors' abstract. We don't add key points for this paper.

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.