Abstract
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 × 1016 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 H2 molecules. Dissociative attachment to ro-vibrationally excited H2 molecules is the only significant source of H− anywhere in the RAID volume.
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v. 5.6. (2018)Acknowledgements
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014–2018 and 2019–2020 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was supported in part by the Swiss National Science Foundation.
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Furno, I. et al. (2023). Helicon Volume Production of H− and D− Using a Resonant Birdcage Antenna on RAID. In: Bacal, M. (eds) Physics and Applications of Hydrogen Negative Ion Sources. Springer Series on Atomic, Optical, and Plasma Physics, vol 124. Springer, Cham. https://doi.org/10.1007/978-3-031-21476-9_9
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