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Charge state breeding for the acceleration of radioactive ions at TRIUMF

Abstract : Charge state breeding is an important ingredient of most post accelerators at ISOL facilities. It implies the transformation of singly or low charged ions extracted from the on-line target ion source system into highly charged ions, which are better suited for acceleration. For ISAC at TRIUMF the acceptance of the first part of the accelerator requires a maximum A/q value of 30. Further stripping of the ions is done at an energy of 150 keV/u to reach a charge state leading to an A/q value <7 for the final acceleration up to 5 MeV/u. That means in order to accelerate ions with a mass greater than 30 charge state breeding is necessary and to avoid further losses due to the stripping the charge state breeding should go to charge states with an A/q value <7. A 14.5 GHz ECRIS (PHOENIX from Pantechniquk) has been chosen as it is well adapted to the continuous mode operation of the ISAC facility. The source has been tested at an offline test bench before it has been integrated into the ISAC on-line beam line system. Both the injection and extraction ion optics have been exchanged by a two step system to increase the efficiency and to simplify the change of the sources operating voltage. The latter is necessary to adapt the ion energy to the acceptance of the accelerator. During a first test in fall 2008 a beam of 80Rb14+ was successfully created from 80Rb1+ and accelerated by the ISAC post accelerator. Further tests with different stable and radioactive isotopes from the ISAC on-line sources and from a test source with stable Cs are ongoing and results will be presented.
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http://hal.in2p3.fr/in2p3-00423867
Contributor : Emmanuelle Vernay <>
Submitted on : Tuesday, October 13, 2009 - 10:02:24 AM
Last modification on : Thursday, November 19, 2020 - 12:58:40 PM

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F. Ames, R. Baartman, P. Bricault, K. Jayamanna, T. Lamy, et al.. Charge state breeding for the acceleration of radioactive ions at TRIUMF. The 13th International Conference on Ion Sources (ICIS'09), Sep 2009, Gatlinburg, United States. pp.02A903, ⟨10.1063/1.3267844⟩. ⟨in2p3-00423867⟩

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