15-20 October 2017
CERN
Europe/Zurich timezone

4.0-6.0 GHz Extraordinary Mode Experiments on 2.45 GHz Electron Cyclotron Resonance Ion Source

16 Oct 2017, 16:30
2h 30m
CERN

CERN

Centre international de Conférence Genève (CICG). http://www.cicg.ch/
Poster presentation Fundamental processes Poster Session 1

Speaker

Yushi Kato (Osaka University)

Description

A new tandem type source on the basis of electron cyclotron resonance (ECR) plasma has been constructing for producing synthesized ion beams in Osaka Univ. [1] Magnetic mirror field configuration with octupole magnets can be controlled to various shape of ECR zones, namely in the second stage plasma to be available by a pair mirror and a supplemental coil. Noteworthy correlations between these magnetic configurations and production of multicharged ions are investigated in detail, as well as their optimum conditions. We have been considered accessibility condition of electromagnetic and electrostatic waves propagating in ECR ion source (ECRIS) plasma, and then investigated their correspondence relationships with production of multicharged ions. It has been clarified that there exits efficient configuration of ECR zones for producing multicharged ion beams, and then has been suggested that new resonance, i.e. upper hybrid resonances, must have occurred [2]. We have been planning new advanced experiments inducing actively these additional effects for enhanced furthermore multicharged ion beams with launching extra-ordinary (X) mode waves. Initially we have already conducted to applying 9 GHz X-mode microwaves to 2.45 GHz ECRIS, and it have been observed enhancements of higher energy tails of electron energy distributions function measured by the probe methods [3]. Next we have been try to similar experiments with 6 GHz X-mode microwaves, and in this paper we will describe the preliminary experimental results.

References

[1] Y. Kato, Y. Kurisu, D. Nozaki, K. Yano, D. Kimura, S. Kumakura, Y. Imai, T. Nishiokada, F. Sato, and T. Iida, Review of Scientific Instruments, 85(2014)02A950-1-3.

[2] Y. Kato, K. Yano, T. Nishiokada, T. Nagaya, D. Kimura, S. Kumakura, Y. Imai, S. Hagino, T. Otsuka, and Fuminobu Sato, 87(2016)02A710-1-4.

[3] T. Nishiokada, T. Nagaya, S. Hagino, T. Otsuka, M. Muramatsu, F. Sato, A. Kitagawa, and Y. Kato, Review of Scientific Instruments, 87(2016)02A714-1-3.

Primary author

Yushi Kato (Osaka University)

Co-authors

Mr Takuya Nishiokada (Osaka University) Mr Tomoki Nagaya (Osaka University) Mr Shogo Hagino (Osaka University) Mr Takuro Otsuka (Osaka University) Mr Takuto Watanabe (Osaka University) Mr Yuto Tsuda (Osaka University) Mr Kouta Hamada (Osaka University) Mr Koji Onishi (Osaka University) Mr Tatsuto Takeda (Osaka University) Prof. Toyohisa Asaji (National Institute of Technology, Toyama College)

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