Abstract
A revised L mode matching unit is used for the radio-frequency (RF) ion source test facility at Huazhong University of Science and Technology (HUST). The revised matching unit is composed of a series capacitance, a parallel capacitance and a RF transformer. The electrical parameters of the two capacitances are estimated when the RF transformer is approximated to be ideal. Without plasma, impedance matching for a nine turn RF coil and a six turn RF coil indicates that the approximation could work well. However, after plasma ignition, the matching condition becomes bad when impedance matching without plasma. Then impedance matching by frequency variation as well as the parallel capacitance tuning together is discussed to keep good matching condition in the running of the ion source.
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References
E. Speth et al., Overview of the RF source development programme at IPP Garching. Nucl. Fusion 46, S220 (2006)
D. Sudhir et al., Online tuning of impedance matching circuit for long pulse inductively coupled plasma source operation—an alternate approach. Rev. Sci. Instrum. 85(1), 013510 (2014)
A. Zamengo et al., Electrical and thermal analyses for the radio-frequency circuit of ITER NBI ion source. Fusion Eng. Des. 84(7), 2025 (2009)
E. Gaio et al., Studies on the radio frequency power supply system for the ITER NB injector ion source. Fusion Eng. Des. 82(5), 912 (2007)
P. Franzen et al., RADI—a RF source size-scaling experiment towards the ITER neutral beam negative ion source. Fusion Eng. Des. 82(4), 407 (2007)
M. Singh et al. RF-plasma source commissioning in Indian negative ion facility. in Second International Symposium On Negative Ions, Beams And Sources (AIP Publishing, 2011), p. 604
R.B. Piejak et al., A simple analysis of an inductive RF discharge. Plasma Sources Sci. T. 1(3), 179 (1992)
M.D. Pozar. Microwave Engineers, 4th Edition. (Hoboken: Wiley 2012) ISBN: 978-0-470-63155-3
Acknowledgments
This work is supported by the Ministry of Science and Technology of China and Hubei Collaboration Innovation Center of Non-Power Nuclear Technology.
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Yue, H., Li, D., Zhao, P. et al. The Matching Unit for the RF Ion Source at HUST. J Fusion Energ 34, 1229–1233 (2015). https://doi.org/10.1007/s10894-015-9944-1
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DOI: https://doi.org/10.1007/s10894-015-9944-1