Removal of molecular contamination in low-energy RIBs by the isolation-dissociation-isolation method

Florian Greiner, Timo Dickel, Samuel Ayet San Andrés, Julian Bergmann, Paul Constantin, Jens Ebert, Hans Geissel, Emma Haettner, Christine Hornung, Ivan Miskun, Wayne Lippert, Israel Mardor, Iain Moore, Wolfgang R. Plaß, Sivaji Purushothaman, Ann Kathrin Rink, Moritz P. Reiter, Christoph Scheidenberger, Helmut Weick

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)324-326
Number of pages3
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume463
DOIs
StatePublished - 15 Jan 2020

Keywords

  • Beam purification
  • Collision-induced dissociation
  • Low-energy RIB
  • Molecular contamination
  • RF-quadrupole

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