A Spiral-RFQ has been built and operated with Ar~+-beams up to 8 mA. In rf-tests very high electrode voltages were reached at design duty factor. The aim of the experiments was the test of the Spiral-RFQ for the High Current Injector (HSI), which is planned at GSI to fill the Heavy Ion Synchrotron (SIS) up to its space charge limit. This Spiral-RFQ, a prototype for the HSI-RFQ, covers the crucial matching and bunching section of the electrodes. It is capable to produce ion beams of high brilliance. The results of recent beam experiments with Ar~+ and rf-tests will be presented together with work for future plasma physics experiments.
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