Abstract
In the last few years substantial progress on the performance of the electron impact ionizer and the double charge exchanger has been made in our laboratory. A proton or deuteron beam intensity of over 100 μA has been observed in the positive stage of the source. A polarized negative ion intensity of 6 μA was obtained after the charge exchange. After acceleration in the ETH EN‐tandem accelerator 2 to 3 μA of polarized deuterons with 90% polarization could be focussed through a 3 mm diameter collimator on a target. This is the highest value ever reported for an accelerated beam.At present we investigate improvements of the atomic beam stage. With presently available techniques some 100 μA of polarized H− and D− ions can be obtained with this type of source. New developments suggest that it is possible to reach in the future a beam intensity in the mA range.
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