Study of the negative ion extraction mechanism from a double-ion plasma in negative ion sources

I. Goto; K. Miyamoto; S. Nishioka; A. Hatayama

doi:10.1063/1.4916420

Study of the negative ion extraction mechanism from a double-ion plasma in negative ion sources

I. Goto, K. Miyamoto, S. Nishioka, A. Hatayama

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

2 Citations (Scopus)

Abstract

We have developed a 2D3V-PIC model of the extraction region, aiming to clarify the basic extraction mechanism of H ^- ions from the double-ion plasma in H ^- negative ion sources. The result shows the same tendency of the H ^- ion density nH ^- as that observed in the experiments, i.e.,nH ^- in the upstream region away from the plasma meniscus (H ^- emitting surface) has been reduced by applying the extraction voltage. At the same time, relatively slow temporal oscillation of the electric potential compared with the electron plasma frequency has been observed in the extraction region. Results of the systematic study using a 1D3V-PIC model with the uniform magnetic field confirm the result that the electrostatic oscillation is identified to be lower hybrid wave. The effect of this oscillation on the H ^- transport will be studied in the future.

Original language	English
Title of host publication	4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014
Editors	Werner Kraus, Paul McNeely
Publisher	American Institute of Physics Inc.
ISBN (Electronic)	9780735412972
DOIs	https://doi.org/10.1063/1.4916420
Publication status	Published - 2015 Apr 8
Externally published	Yes
Event	4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014 - Garching, Germany Duration: 2014 Oct 6 → 2014 Oct 10

Publication series

Name	AIP Conference Proceedings
Volume	1655
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014
Country/Territory	Germany
City	Garching
Period	14/10/6 → 14/10/10

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1063/1.4916420

Cite this

Goto, I., Miyamoto, K., Nishioka, S., & Hatayama, A. (2015). Study of the negative ion extraction mechanism from a double-ion plasma in negative ion sources. In W. Kraus, & P. McNeely (Eds.), 4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014 Article 020011 (AIP Conference Proceedings; Vol. 1655). American Institute of Physics Inc.. https://doi.org/10.1063/1.4916420

Study of the negative ion extraction mechanism from a double-ion plasma in negative ion sources. / Goto, I.; Miyamoto, K.; Nishioka, S. et al.
4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014. ed. / Werner Kraus; Paul McNeely. American Institute of Physics Inc., 2015. 020011 (AIP Conference Proceedings; Vol. 1655).

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

Goto, I, Miyamoto, K, Nishioka, S & Hatayama, A 2015, Study of the negative ion extraction mechanism from a double-ion plasma in negative ion sources. in W Kraus & P McNeely (eds), 4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014., 020011, AIP Conference Proceedings, vol. 1655, American Institute of Physics Inc., 4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014, Garching, Germany, 14/10/6. https://doi.org/10.1063/1.4916420

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title = "Study of the negative ion extraction mechanism from a double-ion plasma in negative ion sources",

abstract = " We have developed a 2D3V-PIC model of the extraction region, aiming to clarify the basic extraction mechanism of H - ions from the double-ion plasma in H - negative ion sources. The result shows the same tendency of the H - ion density nH - as that observed in the experiments, i.e.,nH - in the upstream region away from the plasma meniscus (H - emitting surface) has been reduced by applying the extraction voltage. At the same time, relatively slow temporal oscillation of the electric potential compared with the electron plasma frequency has been observed in the extraction region. Results of the systematic study using a 1D3V-PIC model with the uniform magnetic field confirm the result that the electrostatic oscillation is identified to be lower hybrid wave. The effect of this oscillation on the H - transport will be studied in the future.",

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AU - Nishioka, S.

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N2 - We have developed a 2D3V-PIC model of the extraction region, aiming to clarify the basic extraction mechanism of H - ions from the double-ion plasma in H - negative ion sources. The result shows the same tendency of the H - ion density nH - as that observed in the experiments, i.e.,nH - in the upstream region away from the plasma meniscus (H - emitting surface) has been reduced by applying the extraction voltage. At the same time, relatively slow temporal oscillation of the electric potential compared with the electron plasma frequency has been observed in the extraction region. Results of the systematic study using a 1D3V-PIC model with the uniform magnetic field confirm the result that the electrostatic oscillation is identified to be lower hybrid wave. The effect of this oscillation on the H - transport will be studied in the future.

AB - We have developed a 2D3V-PIC model of the extraction region, aiming to clarify the basic extraction mechanism of H - ions from the double-ion plasma in H - negative ion sources. The result shows the same tendency of the H - ion density nH - as that observed in the experiments, i.e.,nH - in the upstream region away from the plasma meniscus (H - emitting surface) has been reduced by applying the extraction voltage. At the same time, relatively slow temporal oscillation of the electric potential compared with the electron plasma frequency has been observed in the extraction region. Results of the systematic study using a 1D3V-PIC model with the uniform magnetic field confirm the result that the electrostatic oscillation is identified to be lower hybrid wave. The effect of this oscillation on the H - transport will be studied in the future.

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Study of the negative ion extraction mechanism from a double-ion plasma in negative ion sources

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