Radiofrequency and 2.45 GHz electron cyclotron resonance H− volume production ion sources
Tarvainen, O., & Peng, S. X. (2016). Radiofrequency and 2.45 GHz electron cyclotron resonance H− volume production ion sources. New Journal of Physics, 18(10), Article 105008. https://doi.org/10.1088/1367-2630/18/10/105008
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© 2016 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. This is an open access article distributed under the terms of a Creative Commons License.
The volume production of negative hydrogen ions (H-) in plasma ion sources is based on dissociative
electron attachment (DEA)to rovibrationally excited hydrogen molecules(H2), which is a two-step
process requiring both, hot electrons for ionization, and vibrational excitation of the H2 and cold
electrons for the H- formation through DEA. Traditionally H- ion sources relying on the volume
production have been tandem-type arc discharge sources equipped with biased filament cathodes
sustaining the plasma by thermionic electron emission and with a magnetic filter separating the main
discharge from the H- formation volume. The main motivation to develop ion sources based on
radiofrequency (RF) or electron cyclotron resonance (ECR) plasma discharges is to eliminate the
apparent limitation of the cathode lifetime. In this paper we summarize the principles of H- volume
production dictating the ion source design and highlight the differences between the arc discharge and
RF/ECR ion sources from both, physics and technology point-of-view. Furthermore, we introduce
the state-of-the-art RF and ECR H- volume production ion sources and review the challenges and
future prospects of these yet developing technologies.
...
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Except where otherwise noted, this item's license is described as © 2016 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. This is an open access article distributed under the terms of a Creative Commons License.
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