A design study for an internal gas-jet target for the heavy-ion storage ring CRYRING

Abstract

This paper presents the design of the internal gas-jet target, CRYJET, which is being constructed for investigations of, e.g., fast ion--atom collisions in the heavy-ion storage and cooler ring CRYRING at the Manne Siegbahn Laboratory, Stockholm University. The goal for the design work was to create an ultra-cold He target (< = 10 mK in the longitudinal direction and 0.5 mK transverse temperature) with a density of ∼ 1012 atoms/cm3. Care was taken in order to minimize the influence from the jet on the very low background pressure in the storage ring (∼ 10-11 mbar). The low temperature is essential for the resolution in the experiments. The high density will enable us to get sufficient luminosities for investigations of processes with cross sections down to the 10-27 cm2 range. The gas-jet target will be equipped with two recoil-ion-momentum spectrometers in order to extract detailed information about the collision dynamics.