Speaker
Description
The efficiency of stripping heavy ions like uranium into a single charge state at 1.4 MeV/u using a gas target can be increased significantly by applying hydrogen instead of nitrogen, thereby narrowing the resulting charge state spectrum. However, pulsed injection into a dedicated interaction chamber will be required to reduce the load of the vacuum pumping system to an acceptable level. Such a setup was developed, a prototype constructed and studied thoroughly in various dedicated machine development beamtimes at GSI/Germany. During the last two user beamtimes, the prototype setup was operated under regular operating conditions with nitrogen, while hydrogen operation is restricted to machine studies due to necessary safety measures still under completion. Several ion species have been stripped in the course of the beamtimes and valuable data on stripping efficiencies have been measured with both gases. An overview of the technical challenges encountered, operational experience and results obtained so far, and an outlook towards regular operation with hydrogen will be presented.
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