Experimental results on ITER-NBI concept source

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.51298· OSTI ID:451328

Miyamoto, N; Oguri, H; Okumura, Y; Inoue, T; Fujiwara, Y; Miyamoto, K; Nagase, A; Ohara, Y; Watanabe, K ^[1]

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1. Japan Atomic Energy Research Institute, Naka Research Establishment, Naka-machi, Naka-gun, Ibaraki-ken, 311-01 (Japan)

A negative ion source, which produces a high current density H{sup {minus}} ion beam at a low operating pressure, has been developed. The ion source has the same design concept as the large negative ion source for ITER NBI. The negative ions are produced in a Cs seeded multi-cusp plasma generator. To produce negative ions efficiently at a low pressure, the plasma generator is designed to have a semi-cylindrical configuration where the plasma is confined effectively by strong magnetic line cusps with a high volume-surface ratio. Stable arc was generated at a low operating pressure of under 0.1 Pa. The ion source produced 2.1 A H{sup {minus}} ion beams with a current density of 30 mA/cm{sup 2} at an operating pressure of as low as 0.2 Pa in a cesium seeded operation. Taking the isotope effect of the H{sup {minus}}/D{sup {minus}} production into account, the achieved current density is equivalent to the D{sup {minus}} current density of 24 mA/cm{sup 2}, which satisfies the design value for ITER NBI. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 451328
• Report Number(s): CONF-9510304--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 380; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

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