Offline test of a Cryogenic Stopping Cell for the Low-Energy Branch of the Super-FRS at FAIR

Here we report the first successful offline test of the cryogenic gas stoping cell developed for the low-energy branch of the Super Fragment Separator (Super-FRS) at FAIR in Darmstadt, Germany. This gas cell has a stopping volume of length 1 m and diameter 0.25 m. A DC field throughout the length of the cell and a RF carpet with DC field superimposed at the exit side to guide the ions towards the exit-hole without hitting the wall are opted to ensure the fast and efficient extraction of the ions stopped throughout the volume of the cell (Figure 1). Once the ions reach the exit hole, the gas flow will drag them out of the stopping volume. Extensive simulations were performed to guide the design of the DC and RF ion guides of the stopping cell [1].