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At the FRS Ion Catcher (FRS-IC), projectile and fission fragments areproduced at relativistic energies, separated in-flight, energy-bunched, sloweddown, and thermalized in the ultra-pure helium gas-filled cryogenic stoppingcell (CSC). Thermalized nuclei are extracted from the CSC using a combinationof DC and RF electric fields and gas flow. This CSC also serves as theprototype CSC for the Super-FRS, where exotic nuclei will be produced atunprecedented rates making it possible to go towards the extremes of thenuclear chart. Therefore, it is essential to efficiently extract thermalizedexotic nuclei from the CSC under high beam rate conditions, in order to use therare exotic nuclei which come as cocktail beams. The extraction efficiencydependence on the intensity of the impinging beam into the CSC was studied witha primary beam of 238U and its fragments. Tests were done with two differentversions of the DC electrode structure inside the cryogenic chamber, thestandard 1 m long and a short 0.5 m long DC electrode. In contrast to the ratecapability of 10^4 ions/s with the long DC electrode, results show noextraction efficiency loss up to the rate of 2x10^5 ions/s with the new shortDC electrode. This order of magnitude increase of the rate capability paves theway for new experiments at the FRS-IC, including exotic nuclei studies within-cell multi-nucleon transfer reactions. The results further validate thedesign concept of the CSC for the Super-FRS, which was developed to effectivelymanage beams of even higher intensities.

Increasing the rate capability for the cryogenic stopping cell of the FRS Ion Catcher