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For the new radial injector of the Wendelstein 7-AS stellerator, two medium size 40 kW RF sources ('W7-AS RF source') have been built and tested. A positive hydrogen ion beam of 28 A at 50 kV with a proton fraction of 60% has been extracted. For future injection systems, in particular those based on negative ions, large area beam extraction and long pulse capability up to cw operation are envisaged...
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