Experiments with the High Current RFQ Prototype for GSI*

A new high current injector (HSI) for the UNILAC and the SIS synchrotron for all ions up to Uranium is planned at GSI [1],[2]. The Spiral-RFQ accelerator accepts low energy (2.2 keV/u), high current (25 mA) beams with low charge states (U”+) at an operating frequency of 27 MHz. Results of particle dynamics calculations and structure development for the first crucial part of the HSI-RFQ, where all bunch forming is done, are presented together with results of rf measurements and first beam tests. I