Simulations and experiments for the next-generation cryogenic stopping cell of the Super-FRS

A design of a new-generation cryogenic stopping cell (CSC) for the Low-Energy Branch of the Super-FRS at FAIR has been recently developed. It is based on the experience obtained with the CSC prototype, which was successfully commissioned over a series of beamtimes at the FRS Ion Catcher at GSI. The new system will have improved performance parameters due to the implementation of novel concepts in its design. The extraction direction will be changed from inline to perpendicular to the axis of the incident beam, hence decreasing the path of ions inside the CSC. In combination with high electrical fields applied, this will shorten the extraction times by a factor of 5 (∝5 ms in comparison with ∝25 ms for CSC prototype) and also improve the rate capabilities of the system by three orders of magnitude. The inner chamber will be divided in two parts: high-density stopping region (∝30 mg/cm² of He) and low-density extraction region. Simulation investigations of ion transport in the system have been performed and an experimental confirmation of some of the novel concepts for the future system has been made.