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An ion beam cooler has been constructed to adapt the ISOLDE rare isotope beam emittance to the acceptance of the mass spectrometer MISTRAL, CERN. In a test experiment a Na + -beam was extracted out of the gas filled, linear Paul Trap with an emittance of 8π mm mrad at 6keV. Near 100% transmission through a new electrostatic deceleration system was measured for a 30keV He + -beam which...
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