Recently two additional Demonstrator machine runs have been accomplished after successful commissioning of the demonstrator cryomodule equipped with a 217 MHz multi gap Crossbar H-mode structure (CH) and first testing with beam from the GSI High Charge State Injector.
The required acceleration gain of 0.5 MeV/u has been confirmed with heavy ion beams at maximum available beam intensity and full beam transmission. Further systematic heavy ion beam measurements with varying RF-amplitudes and -phases of the CH-cavity were accomplished. The worldwide first and successful beam testing with a superconducting multi gap CH-cavity is a milestone of the R&D work in preparation of the entire sc cw heavy ion Linac project and other cw-ion beam application.
Meanwhile further experiences have been gained in design, fabrication and operation of sc CH-cavities and the associated components. Newly developed beam instrumentation, as a cold beam position monitor, an advanced beam transformator for cw-application (DCCT) and a bunch structure monitor (Feshenko monitor) have been developed, built and tested with heavy ion beam. A newly developed method to reconstruct the longitudinal phase space based on bunch shape measurements could be successfully applied.
At GSI (Darmstadt) the test demonstrator area extension for housing the advanced cryomodule has been already started.
The Link to the GSI cryo infrastructure could be successfully installed in January 2019, supplying the test area as well as the cw-Linac.