RF plasma modeling of the Linac4 H- ion source

S. Mattei; M. Ohta; A. Hatayama; J. Lettry; Y. Kawamura; M. Yasumoto; C. Schmitzer

doi:10.1063/1.4792807

RF plasma modeling of the Linac4 H^- ion source

S. Mattei, M. Ohta, A. Hatayama, J. Lettry, Y. Kawamura, M. Yasumoto, C. Schmitzer

Department of Applied Physics and Physico-Informatics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

13 Citations (Scopus)

Abstract

This study focuses on the modelling of the ICP RF-plasma in the Linac4 H^- ion source currently being constructed at CERN. A self-consistent model of the plasma dynamics with the RF electromagnetic field has been developed by a PIC-MCC method. In this paper, the model is applied to the analysis of a low density plasma discharge initiation, with particular interest on the effect of the external magnetic field on the plasma properties, such as wall loss, electron density and electron energy. The employment of a multi-cusp magnetic field effectively limits the wall losses, particularly in the radial direction. Preliminary results however indicate that a reduced heating efficiency results in such a configuration. The effect is possibly due to trapping of electrons in the multi-cusp magnetic field, preventing their continuous acceleration in the azimuthal direction.

Original language	English
Title of host publication	Third International Symposium on Negative Ions, Beams and Sources, NIBS 2012
Pages	386-393
Number of pages	8
DOIs	https://doi.org/10.1063/1.4792807
Publication status	Published - 2013
Event	3rd International Symposium on Negative Ions, Beams and Sources, NIBS 2012 - Jyvaskyla, Finland Duration: 2012 Sept 3 → 2012 Sept 7

Publication series

Name	AIP Conference Proceedings
Volume	1515
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Other

Other	3rd International Symposium on Negative Ions, Beams and Sources, NIBS 2012
Country/Territory	Finland
City	Jyvaskyla
Period	12/9/3 → 12/9/7

Keywords

Monte Carlo method
Particle-in-cell
Plasma simulation
RF negative ion source

ASJC Scopus subject areas

Ecology, Evolution, Behavior and Systematics
Ecology
Plant Science
Physics and Astronomy(all)
Nature and Landscape Conservation

Access to Document

10.1063/1.4792807

Cite this

Mattei, S, Ohta, M, Hatayama, A, Lettry, J, Kawamura, Y, Yasumoto, M & Schmitzer, C 2013, RF plasma modeling of the Linac4 H^- ion source. in Third International Symposium on Negative Ions, Beams and Sources, NIBS 2012. AIP Conference Proceedings, vol. 1515, pp. 386-393, 3rd International Symposium on Negative Ions, Beams and Sources, NIBS 2012, Jyvaskyla, Finland, 12/9/3. https://doi.org/10.1063/1.4792807

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AU - Mattei, S.

AU - Ohta, M.

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AU - Lettry, J.

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AU - Yasumoto, M.

AU - Schmitzer, C.

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AB - This study focuses on the modelling of the ICP RF-plasma in the Linac4 H- ion source currently being constructed at CERN. A self-consistent model of the plasma dynamics with the RF electromagnetic field has been developed by a PIC-MCC method. In this paper, the model is applied to the analysis of a low density plasma discharge initiation, with particular interest on the effect of the external magnetic field on the plasma properties, such as wall loss, electron density and electron energy. The employment of a multi-cusp magnetic field effectively limits the wall losses, particularly in the radial direction. Preliminary results however indicate that a reduced heating efficiency results in such a configuration. The effect is possibly due to trapping of electrons in the multi-cusp magnetic field, preventing their continuous acceleration in the azimuthal direction.

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