Effects of plasma-facing materials on the negative ion (H-/D-) current extracted from an ECR plasma source

Abstract : The possibility of enhancing the extracted negative ion (H-/D-) current due to plasma-surface interactions on selected materials (potential alternatives of Cs in NBI for tokamak), is herein demonstrated. Current results, from plasmas sustained at a few mTorr by ECR dipolar plasma sources, as obtained with laser photodetachment at 1064 nm, demonstrate that, when tungsten material faces plasma it induces an obvious enhancement of the negative ion density. An extracting system using magnetic cores and three cooled electrodes are used to evaluate effects of the material itself and its relative position in the plasma, on the extracted current. The influence of the dimensions and geometry of the extracting aperture on the beam intensity, are also studied.
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Conference papers
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http://hal.in2p3.fr/in2p3-01572034
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Submitted on : Friday, August 4, 2017 - 1:59:46 PM
Last modification on : Monday, October 1, 2018 - 4:02:52 PM

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  • HAL Id : in2p3-01572034, version 1

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S. Béchu, F. Biggins, J. Angot, S. Aleiferis, P. Svarnas, et al.. Effects of plasma-facing materials on the negative ion (H-/D-) current extracted from an ECR plasma source . XXXIII International Conference on Phenomena in Ionized Gases (ICPIG 2017), Jul 2017, Estoril, Portugal. pp.63. ⟨in2p3-01572034⟩

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