Negative ion studies on the RF plasma device MAGPIE

H. V. Willett; J. Santoso; C. S. Corr; K. J. Gibson

Negative ion studies on the RF plasma device MAGPIE

H. V. Willett, J. Santoso, C. S. Corr, K. J. Gibson

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

Abstract

Neutral beam injection (NBI) systems provide both heating and current drive in tokamak fusion reactors. High energy (> 1 MeV) neutral beams are produced by neutralising accelerated ions, for which negative ions are used; the neutralisation cross section for positive ions becomes negligible at these energies. This requires very high throughput negative ion sources. Currently this is achieved using inductively coupled plasma sources, which incorporate caesium to improve the production rate. It has been proposed that helicon plasma sources could provide a more efficient, higher throughput method of producing negative ions for NBI, possibly even removing the need for caesium. We report on studies of the negative hydrogen ion population in the MAGPIE helicon device (Australian National University) under a variety of operating conditions. The probe-based laser photodetachment method and Langmuir probes are employed to estimate the negative hydrogen ion density throughout the device. Initial results support the viability of helicon-based negative ion sources.

Original language	English
Title of host publication	44th EPS Conference on Plasma Physics, EPS 2017
Editors	A. Bret, M. Fajardo, E. Westerhof, A. Melzer, B. Dromey, C. Riconda
Publisher	European Physical Society (EPS)
ISBN (Print)	9781510849303
Publication status	Published - 2017
Event	44th European Physical Society Conference on Plasma Physics, EPS 2017 - Belfast, United Kingdom Duration: 26 Jun 2017 → 30 Jun 2017

Publication series

Name	44th EPS Conference on Plasma Physics, EPS 2017

Conference

Conference	44th European Physical Society Conference on Plasma Physics, EPS 2017
Country/Territory	United Kingdom
City	Belfast
Period	26/06/17 → 30/06/17

Cite this

@inproceedings{908184c2f8b842e48fcb6ffd20f72bca,

title = "Negative ion studies on the RF plasma device MAGPIE",

abstract = "Neutral beam injection (NBI) systems provide both heating and current drive in tokamak fusion reactors. High energy (> 1 MeV) neutral beams are produced by neutralising accelerated ions, for which negative ions are used; the neutralisation cross section for positive ions becomes negligible at these energies. This requires very high throughput negative ion sources. Currently this is achieved using inductively coupled plasma sources, which incorporate caesium to improve the production rate. It has been proposed that helicon plasma sources could provide a more efficient, higher throughput method of producing negative ions for NBI, possibly even removing the need for caesium. We report on studies of the negative hydrogen ion population in the MAGPIE helicon device (Australian National University) under a variety of operating conditions. The probe-based laser photodetachment method and Langmuir probes are employed to estimate the negative hydrogen ion density throughout the device. Initial results support the viability of helicon-based negative ion sources.",

author = "Willett, {H. V.} and J. Santoso and Corr, {C. S.} and Gibson, {K. J.}",

year = "2017",

language = "English",

isbn = "9781510849303",

series = "44th EPS Conference on Plasma Physics, EPS 2017",

publisher = "European Physical Society (EPS)",

editor = "A. Bret and M. Fajardo and E. Westerhof and A. Melzer and B. Dromey and C. Riconda",

booktitle = "44th EPS Conference on Plasma Physics, EPS 2017",

note = "44th European Physical Society Conference on Plasma Physics, EPS 2017 ; Conference date: 26-06-2017 Through 30-06-2017",

}

Willett, HV, Santoso, J, Corr, CS & Gibson, KJ 2017, Negative ion studies on the RF plasma device MAGPIE. in A Bret, M Fajardo, E Westerhof, A Melzer, B Dromey & C Riconda (eds), 44th EPS Conference on Plasma Physics, EPS 2017., P2.402, 44th EPS Conference on Plasma Physics, EPS 2017, European Physical Society (EPS), 44th European Physical Society Conference on Plasma Physics, EPS 2017, Belfast, United Kingdom, 26/06/17.

Negative ion studies on the RF plasma device MAGPIE. / Willett, H. V.; Santoso, J.; Corr, C. S. et al.
44th EPS Conference on Plasma Physics, EPS 2017. ed. / A. Bret; M. Fajardo; E. Westerhof; A. Melzer; B. Dromey; C. Riconda. European Physical Society (EPS), 2017. P2.402 (44th EPS Conference on Plasma Physics, EPS 2017).

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

TY - GEN

T1 - Negative ion studies on the RF plasma device MAGPIE

AU - Willett, H. V.

AU - Santoso, J.

AU - Corr, C. S.

AU - Gibson, K. J.

PY - 2017

Y1 - 2017

N2 - Neutral beam injection (NBI) systems provide both heating and current drive in tokamak fusion reactors. High energy (> 1 MeV) neutral beams are produced by neutralising accelerated ions, for which negative ions are used; the neutralisation cross section for positive ions becomes negligible at these energies. This requires very high throughput negative ion sources. Currently this is achieved using inductively coupled plasma sources, which incorporate caesium to improve the production rate. It has been proposed that helicon plasma sources could provide a more efficient, higher throughput method of producing negative ions for NBI, possibly even removing the need for caesium. We report on studies of the negative hydrogen ion population in the MAGPIE helicon device (Australian National University) under a variety of operating conditions. The probe-based laser photodetachment method and Langmuir probes are employed to estimate the negative hydrogen ion density throughout the device. Initial results support the viability of helicon-based negative ion sources.

AB - Neutral beam injection (NBI) systems provide both heating and current drive in tokamak fusion reactors. High energy (> 1 MeV) neutral beams are produced by neutralising accelerated ions, for which negative ions are used; the neutralisation cross section for positive ions becomes negligible at these energies. This requires very high throughput negative ion sources. Currently this is achieved using inductively coupled plasma sources, which incorporate caesium to improve the production rate. It has been proposed that helicon plasma sources could provide a more efficient, higher throughput method of producing negative ions for NBI, possibly even removing the need for caesium. We report on studies of the negative hydrogen ion population in the MAGPIE helicon device (Australian National University) under a variety of operating conditions. The probe-based laser photodetachment method and Langmuir probes are employed to estimate the negative hydrogen ion density throughout the device. Initial results support the viability of helicon-based negative ion sources.

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M3 - Conference contribution

SN - 9781510849303

T3 - 44th EPS Conference on Plasma Physics, EPS 2017

BT - 44th EPS Conference on Plasma Physics, EPS 2017

A2 - Bret, A.

A2 - Fajardo, M.

A2 - Westerhof, E.

A2 - Melzer, A.

A2 - Dromey, B.

A2 - Riconda, C.

PB - European Physical Society (EPS)

T2 - 44th European Physical Society Conference on Plasma Physics, EPS 2017

Y2 - 26 June 2017 through 30 June 2017

ER -

Negative ion studies on the RF plasma device MAGPIE

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