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Separation of atomic and molecular ions by ion mobility with an RF carpet

Year of publication

2021

Authors

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

Gas-filled stopping cells are used at accelerator laboratories for the thermalization of high-energy radioactive ion beams. Common challenges of many stopping cells are a high molecular background of extracted ions and limitations of extraction efficiency due to space-charge effects. At the FRS Ion Catcher at GSI, a new technique for removal of ionized molecules prior to their extraction out of the stopping cell has been developed. This technique utilizes the RF carpet for the separation of atomic ions from molecular contaminant ions through their difference in ion mobility. Results from the successful implementation and test during an experiment with a 600 MeV/u 124 Xe primary beam are presented. Suppression of molecular contaminants by three orders of magnitude has been demonstrated. Essentially background-free measurement conditions with less than 1% of background events within a mass-to-charge range of 25 u/e have been achieved. The technique can also be used to reduce the space-charge effects at the extraction nozzle and in the downstream beamline, thus ensuring high efficiency of ion transport and highly-accurate measurements under space-charge-free conditions.
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Organizations and authors

Publication type

Publication format

Article

Parent publication type

Journal

Article type

Original article

Audience

Scientific

Peer-reviewed

Peer-Reviewed

MINEDU's publication type classification code

A1 Journal article (refereed), original research

Publication channel information

Publisher

Elsevier BV

Volume

459

Article number

116450

​Publication forum

58604

​Publication forum level

1

Open access

Open access in the publisher’s service

Yes

Open access of publication channel

Partially open publication channel

Self-archived

Yes

Other information

Fields of science

Physical sciences

Keywords

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Publication country

Netherlands

Internationality of the publisher

International

Language

English

International co-publication

Yes

Co-publication with a company

No

DOI

10.1016/j.ijms.2020.116450

The publication is included in the Ministry of Education and Culture’s Publication data collection

Yes