Pulsed operation of a SNICS ion source – ionization efficiency and ion current output

Autor(en)

Martin Martschini, Petra Holzer, Esad Hrnjic, Alfred Priller, Peter Steier, Robin Golser

Abstrakt

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(en)

Isotopenphysik

Externe Organisation(en)

Universität Wien

Journal

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

Band

527

Seiten

7-11

Anzahl der Seiten

5

ISSN

0168-583X

DOI

https://doi.org/10.1016/j.nimb.2022.07.006

Publikationsdatum

09-2022

Peer-reviewed

Ja

ÖFOS 2012

103014 Kernphysik

Schlagwörter

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics, Instrumentation

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/pulsed-operation-of-a-snics-ion-source--ionization-efficiency-and-ion-current-output(207069b9-8754-4422-a085-5ea3ba1f0685).html