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Chapitre D'ouvrage Année : 2023

Helicon volume production of H$^−$ and D$^−$ using a resonant birdcage antenna on RAID

Résumé

Negative ion production by volumetric processes is investigated in the RAID linear device using experiments and modeling. Measurements by optical emission spectroscopy, cavity ring-down spectroscopy, and Langmuir probe assisted laser photodetachment are combined and reveal that H$^−$ and D$^−$ ions are distributed in a halo around the plasma column with densities of 2 × 10$^{16}$ m$^{-3}$ for only a few kilowatts of RF power in a Cs-free plasma. A hydrogen transport fluid code shows that RAID plasmas have a hot electron core favorable to ro-vibrational excitation and dissociation of H$_2$ molecules. Dissociative attachment to ro-vibrationally excited H$_2$ molecules is the only significant source of H$^−$ anywhere in the RAID volume

Domaines

Plasmas
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Dates et versions

hal-04280387 , version 1 (14-11-2023)

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Ivo Furno, Riccardo Agnello, Alan Howling, Philippe Guittienne, Remy Jacquier, et al.. Helicon volume production of H$^−$ and D$^−$ using a resonant birdcage antenna on RAID. Physics and Applications of Hydrogen Negative Ion Sources, 124, Springer International Publishing, pp.217-249, 2023, Springer Series on Atomic, Optical, and Plasma Physics, 978-3-031-21475-2. ⟨10.1007/978-3-031-21476-9_9⟩. ⟨hal-04280387⟩
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