1. Removal of molecular contamination in low-energy RIBs by the isolation-dissociation-isolation method.
- Author
-
Greiner, Florian, Dickel, Timo, Ayet San Andrés, Samuel, Bergmann, Julian, Constantin, Paul, Ebert, Jens, Geissel, Hans, Haettner, Emma, Hornung, Christine, Miskun, Ivan, Lippert, Wayne, Mardor, Israel, Moore, Iain, Plaß, Wolfgang R., Purushothaman, Sivaji, Rink, Ann-Kathrin, Reiter, Moritz P., Scheidenberger, Christoph, and Weick, Helmut
- Subjects
- *
ION sources , *IONS , *ION bombardment , *COLLISION induced dissociation , *ION beams , *MAGNITUDE (Mathematics) , *SYNCHROTRONS - Abstract
Experiments with low-energy rare ion beams often suffer from a large amount of molecular contaminant ions. We present the simple isolation-dissociation-isolation method to suppress this kind of contamination. The method can be applied to almost all types of low-energy beamlines. In a first step, a coarse isolation of the mass-to-charge ratio of interest is performed, e.g. by a dipole magnet. In a second step, the ions are dissociated. The last step is again a coarse isolation of the mass-to-charge ratio around the ion of interest. The method was tested at the FRS Ion Catcher at GSI with a radioactive ion source installed inside the cryogenic stopping cell as well as with relativistic ions delivered by the synchrotron SIS-18 and stopped in the cryogenic stopping cell. The isolation and dissociation, here collision-induced dissociation, have been implemented in a gas-filled RFQ beamline. A reduction of molecular contamination by more than 4 orders of magnitude was achieved. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF