TY - JOUR
T1 - Removal of molecular contamination in low-energy RIBs by the isolation-dissociation-isolation method
AU - Greiner, Florian
AU - Dickel, Timo
AU - Ayet San Andrés, Samuel
AU - Bergmann, Julian
AU - Constantin, Paul
AU - Ebert, Jens
AU - Geissel, Hans
AU - Haettner, Emma
AU - Hornung, Christine
AU - Miskun, Ivan
AU - Lippert, Wayne
AU - Mardor, Israel
AU - Moore, Iain
AU - Plaß, Wolfgang R.
AU - Purushothaman, Sivaji
AU - Rink, Ann Kathrin
AU - Reiter, Moritz P.
AU - Scheidenberger, Christoph
AU - Weick, Helmut
N1 - Publisher Copyright:
© 2019 The Authors
PY - 2020/1/15
Y1 - 2020/1/15
N2 - 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.
AB - 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.
KW - Beam purification
KW - Collision-induced dissociation
KW - Low-energy RIB
KW - Molecular contamination
KW - RF-quadrupole
UR - http://www.scopus.com/inward/record.url?scp=85065250305&partnerID=8YFLogxK
U2 - 10.1016/j.nimb.2019.04.072
DO - 10.1016/j.nimb.2019.04.072
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AN - SCOPUS:85065250305
VL - 463
SP - 324
EP - 326
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
SN - 0168-583X
ER -