Characteristics of a small multicusp H− source

Ehlers, K. W.; Leung, K. N.; Pyle, R.V.; Kunkel, W.B.

doi:10.1063/1.36541

Cited by 3 publications

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Comparison of H− and D− production in a magnetically filtered multicusp source

Inoue

Ackerman

Cooper

et al. 1990

Review of Scientific Instruments

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A JAERI (Japan Atomic Energy Research Institute)negative ion source was tested at LBL (Lawrence Berkeley Laboratory) as part of the U.S.–Japan Fusion Cooperation Program. By varying the strength of the magnetic filter from 450 to 930 G cm, we compared production, transport, and extraction of the negative ions. The maximum current densities, which were obtained at the corresponding optimum filter strength for each gas species, were 10.4 mA/cm2 for H− and 8.4 mA/cm2 for D− at arc discharges of 40 kW. The ratio of the ion current densities (JD−/JH−) is about 0.8, which is higher than 1/(2)1/2 . The electron to negative ion ratio was 13 for hydrogen and 38 for deuterium at the corresponding optimum filter strength. The higher ratio in deuterium is probably due to higher space potential of deuterium plasma by a few volts.

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Comparison of H− and D− production in a magnetically filtered multicusp source

Inoue

Ackerman

Cooper

et al. 1990

Review of Scientific Instruments

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Proposed neutral-beam diagnostics for fast confined alpha particles in a burning plasma

Schlachter¹,

Cooper²

1987

AIP Conference Proceedings

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Negative hydrogen ion production mechanisms

Bacal

Wada

2015

Applied Physics Reviews

248

173

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International audienceNegative hydrogen/deuterium ions can be formed by processes occurring in the plasma volume and on surfaces facing the plasma. The principal mechanisms leading to the formation of these negative ions are dissociative electron attachment to ro-vibrationally excited hydrogen/deuterium molecules when the reaction takes place in the plasma volume, and the direct electron transfer from the low work function metal surface to the hydrogen/deuterium atoms when formation occurs on the surface. The existing theoretical models and reported experimental results on these two mechanisms are summarized. Performance of the negative hydrogen/deuterium ion sources that emerged from studies of these mechanisms is reviewed. Contemporary negative ion sources do not have negative ion production electrodes of original surface type sources but are operated with caesium with their structures nearly identical to volume production type sources. Reasons for enhanced negative ion current due to caesium addition to these sources are discussed. (31 pages, 265 refs

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Characteristics of a small multicusp H− source

Cited by 3 publications

References 1 publication

Comparison of H− and D− production in a magnetically filtered multicusp source

Comparison of H− and D− production in a magnetically filtered multicusp source

Proposed neutral-beam diagnostics for fast confined alpha particles in a burning plasma

Negative hydrogen ion production mechanisms

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