Effect of double frequency heating on the lead afterglow beam currents of an electron cyclotron resonance ion source
Abstract
The effect of double frequency heating on the performance of the CERN GTS-LHC 14.5 GHz Electron Cyclotron Resonance (ECR) ion source in afterglow mode is reported. The source of the secondary microwave frequency was operated both in pulsed and continuous wave (CW) modes within the range of 12–18 GHz. The results demonstrate that the addition of the secondary frequency can significantly impact the extracted beam currents and the temporal stability of the beam during the afterglow discharge. For example, up to a factor of 2.6 increase was achieved for 208Pb35+ and a factor of 3.1 for 208Pb37+ compared to single frequency afterglow currents. It is shown that these effects are dependent on the choice of the secondary frequency with respect to the primary one and on the temporal synchronization between the two microwave sources. Overall, the results provide new insight into the afterglow discharge supporting the prevailing understanding of the physical processes behind the phenomenon.
Main Authors
Format
Articles
Research article
Published
2017
Series
Subjects
Publication in research information system
Publisher
American Physical Society
Original source
https://journals.aps.org/prab/abstract/10.1103/PhysRevAccelBeams.20.103402
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-201710063947Use this for linking
Review status
Peer reviewed
ISSN
1098-4402
DOI
https://doi.org/10.1103/PhysRevAccelBeams.20.103402
Language
English
Published in
Physical Review Special Topics: Accelerators and Beams
Citation
- Toivanen, V., Bellodi, G., Küchler, D., Wenander, F., & Tarvainen, O. (2017). Effect of double frequency heating on the lead afterglow beam currents of an electron cyclotron resonance ion source. Physical Review Special Topics: Accelerators and Beams, 20(10), Article 103402. https://doi.org/10.1103/PhysRevAccelBeams.20.103402
Copyright© 2017 the Authors. This is an open access article distributed under the terms of the Creative Commons Attribution License.