Publications
Pulsed operation of a SNICS ion source – ionization efficiency and ion current output
- Author(s)
- Martin Martschini, Petra Holzer, Esad Hrnjic, Alfred Priller, Peter Steier, Robin Golser
- Abstract
Possible ion output enhancement for C−, C4−, Al−, AlO−, CaF3− and SrF3− by pulsed operation of an NEC-MC-SNICS II ion source under AMS-conditions has been investigated. The cathode voltage was switched periodically between −5.0 kV for regular sputtering and an idle value of −0.8 kV. With normal Cs-supply, all investigated species showed a peak ion current in pulsed mode similar to their DC ion current. A study of ionization efficiency of Al− from Al2O3 likewise revealed no enhancement. However, current enhancements of up to 400 % for C− and C4− were observed in pulsed mode when strongly reducing the cesium supply. This is not reflected in ionization efficiency. Under Cs-scarcity, the ionization efficiency of C− in pulsed mode was 12–13 % for samples graphitized with AGE-3. Irrespective of Cs-level, AGE-3 samples and powder mixed samples in DC operation yielded 15–16 % and 16–21 %, respectively. Summarizing, no immediate benefits for AMS could be identified.
- Organisation(s)
- Isotope Physics
- External organisation(s)
- University of Vienna
- Journal
- Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
- Volume
- 527
- Pages
- 7-11
- No. of pages
- 5
- ISSN
- 0168-583X
- DOI
- https://doi.org/10.1016/j.nimb.2022.07.006
- Publication date
- 09-2022
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103014 Nuclear physics
- Keywords
- ASJC Scopus subject areas
- Nuclear and High Energy Physics, Instrumentation
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/207069b9-8754-4422-a085-5ea3ba1f0685