2012
DOI: 10.1063/1.3672116
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Spatial distribution of the charged particles and potentials during beam extraction in a negative-ion source

Abstract: We report on the characteristics of the electronegative plasma in a large-scale hydrogen negative ion (H(-)) source. The measurement has been made with a time-resolved Langmuir probe installed in the beam extraction region. The H(-) density is monitored with a cavity ring-down system to identify the electrons in the negative charges. The electron-saturation current decreases rapidly after starting to seed Cs, and ion-ion plasma is observed in the extraction region. The H(-) density steps down during the beam e… Show more

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Cited by 48 publications
(36 citation statements)
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“…The result shows that n H − in the upstream region away from the plasma meniscus has been reduced by applying the extraction voltage. This result shows the similar tendency to the result of the experiments [6,7]. At the same time, electorstatic oscillation has been observed in the extraction region.…”
Section: Resultssupporting
confidence: 79%
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“…The result shows that n H − in the upstream region away from the plasma meniscus has been reduced by applying the extraction voltage. This result shows the similar tendency to the result of the experiments [6,7]. At the same time, electorstatic oscillation has been observed in the extraction region.…”
Section: Resultssupporting
confidence: 79%
“…However, the extraction mechanisms have not been completely clarified yet. Double-ion plasma layer, which is consisting of H + and H − ions, has been observed in the vicinity of Plasma Grid (PG) of Cs-seeded H − negative ion sources, experimentaly [6]. Recent experiments show that H − density n H − in the upstream region away from the plasma meniscus (H − emitting surface) has been reduced by applying the extraction voltage [6,7].…”
Section: Introductionmentioning
confidence: 99%
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“…The intensity of H α emission at the far position of z = 18 mm is higher than that at close position of z = 4 owing to the electron contamination. 5 The H α signal intensity decreased 15% by beam extraction near the PG apertures. The electron temperature measured by an electrostatic probe is 2.3 eV at z = 11 mm.…”
Section: Spatial Distribution Of H α Emission In the Extraction mentioning
confidence: 99%
“…Research oriented to improvements of the negative ion source is necessary. A lot of efforts have been contributed to the improvements of negative hydrogen ion (H − ) sources, in order to increase the performance of negative ion based NBI systems [4][5][6][7][8][9][10][11][12][13] is much higher than the electron density, is generated in the beam extraction region [9]. However, the H − ion rich plasma is affected by the extraction field.…”
Section: Introductionmentioning
confidence: 99%