Status report on the internal gas-jet target for the heavy-ion storage ring CRYRING

A supersonic gas-jet target for investigations of the detailed collision dy namics in fast ion-atom collisions by means of recoil-ion-momentum spectros copy has been constructed for insertion into the heavy-ion storage ring CRY RING, situated at the Manne Siegbahn Laboratory, Stockholm University. The aim is to create a target with a density of 10(12) cm(-3) and a temperature of less than 10 mK (for the case of a He target) without seriously affecti ng the excellent vacuum conditions of CRYRING. The gas target will become a part of the storage ring, and hence fast beams of protons, highly-charged ions, and molecular ions will be available as projectiles. Here we present test results for parts of the system. These all indicate that the design cr iteria will be fulfilled.