VUV emission spectroscopy combined with H− density measurements in the ion source Prometheus I
Aleiferis, S., Laulainen, J., Svarnas, P., Tarvainen, O., Bacal, M., & Béchu, S. (2017). VUV emission spectroscopy combined with H− density measurements in the ion source Prometheus I. In D. Faircloth (Ed.), NIBS 2016 : Fifth International Symposium on Negative Ions, Beams and Sources (Article 030045). AIP Publishing. AIP Conference Proceedings, 1869. https://doi.org/10.1063/1.4995765
Published inAIP Conference Proceedings
© 2017, AIP Publishing LLC. Published in this repository with the kind permission of the publisher.
“Prometheus I” is a volume H− negative ion source, driven by a network of dipolar electron cyclotron resonance (ECR; 2.45 GHz) modules. The vacuum-ultraviolet (VUV) emission spectrum of low-temperature hydrogen plasmas may be related to molecular and atomic processes involved directly or indirectly in the production of negative ions. In this work, VUV spectroscopy has been performed in the above source, Prometheus I, both in the ECR zones and the bulk (far from ECR zones and surfaces) plasma. The acquired VUV spectra are correlated with the negative ion densities, as measured by means of laser photodetachment, and the possible mechanisms of negative ion production are considered. The well-established H− formation process of dissociative attachment to vibrationally excited molecules is evaluated, while an additional production path (i.e. neutral resonant ionization) is tested due to the recently attracted interest. The obtained results indicate that for the source Prometheus I, the dominant formation process is dissociative attachment. ...
Parent publication ISBN
ConferenceInternational Symposium on Negative Ions, Beams and Sources
Is part of publicationNIBS 2016 : Fifth International Symposium on Negative Ions, Beams and Sources
Publication in research information system
MetadataShow full item record
Showing items with similar title or keywords.
Komppula, Jani (University of Jyväskylä, 2015)
Laulainen, Janne; Kalvas, Taneli; Koivisto, Hannu; Kronholm, Risto; Tarvainen, Olli; Aleiferis, S.; Svarnas, P. (AIP Publishing, 2017)Photoelectron emission measurements have been performed using a 2.45 GHz ECR-driven multi-dipolar plasma source in a low pressure hydrogen discharge. Photoelectron currents induced by light emitted from ECR zone and H− ...
Study of gasdynamic electron cyclotron resonance plasma vacuum ultraviolet emission to optimize negative hydrogen ion production efficiency Lapin, R. L.; Skalyga, V. A.; Izotov, I.; Razin, S. V.; Shaposhnikov, R. A.; Vybin, S. S.; Bokhanov, A. F.; Kazakov, M. Yu.; Tarvainen, O. (American Institute of Physics, 2020)Negative hydrogen ion sources are used as injectors into accelerators and drive the neutral beam heating in ITER. Certain processes in low-temperature hydrogen plasmas are accompanied by the emission of vacuum ultraviolet ...
Laulainen, Janne; Kalvas, Taneli; Koivisto, Hannu; Kronholm, Risto; Tarvainen, Olli (AIP Publishing, 2018)Experimental results of low temperature hydrogen plasma induced photoelectron emission measurements comparing two different plasma heating methods are summarized. By exposing the samples to the vacuum ultraviolet radiation ...
The effect of microwave power on the Ar9+ and Ar13+ optical emission intensities and ion beam currents in ECRIS Kronholm, Risto; Sakildien, M.; Neben, D.; Koivisto, Hannu; Kalvas, Taneli; Tarvainen, Olli; Laulainen, J.; Jones, P. (AIP Publishing, 2018)The production of Ar9+ and Ar13+ ions in an ECRIS plasma and the efficiency of the ion beam extraction and transport of the resulting Ar9+ and Ar13+ ion beams have been studied with the JYFL 14 GHz ECRIS by using optical ...